REVIEW article

Front. Built Environ., 28 May 2026

Sec. Sustainable Design and Construction

Volume 12 - 2026 | https://doi.org/10.3389/fbuil.2026.1699277

Evaluation of net-zero strategies in shipping container architecture

  • Department of Architecture, College of Science and Technology, Covenant University, Ota, Nigeria

Abstract

At least 38% of global greenhouse gases come from buildings. The principal causes include reliance on non-renewable energy sources to power shipping container architecture, which has recently been developed as building modules. The purpose of the study is to evaluate various strategies that can transform shipping container architecture into net-zero energy buildings with a view to determining the most effective and sustainable approach for improved environmental performance. The study was curated as a systematic literature review of 40 selected academic publications from peer-reviewed journals, extracted from Google Scholar, Elsevier Scopus, ScienceDirect, and Springer. Case studies of existing shipping container buildings incorporating these net-zero strategies were also examined. The study reveals that residential buildings have remained the focal point of net-zero energy buildings, while commercial buildings receive insufficient attention despite their high energy consumption. The most effective strategies for attaining net-zero energy performance in shipping container architecture were found to be optimal building orientation and shape, insulation, and passive cooling. User-friendly management systems were also found to increase efficiency. In conclusion, the absence of standardized regulations is the major hindrance to the widespread adoption of net-zero shipping container architecture. However, this can be effectively resolved through supportive policies and collaboration between the built industry professionals and container manufacturers.

1 Introduction

At least three-quarters of global carbon emissions are generated by built-up urban areas, which consume between 50% and 76% of global energy (Ohene et al., 2023; Mohammed B. U. et al., 2023; Lin and Chen, 2022; Hachem-Vermette et al., 2018). This implies that more than half of the energy expended can be directly or indirectly linked to buildings (Ekhaese et al., 2024). Additionally, buildings are responsible for 38% of global greenhouse gas emissions (Jegede et al., 2021; Moran et al., 2020). Construction costs and operational expenses are also affected by building facades, which significantly contribute between 15% and 40% to these expenditures (Ibrahim et al., 2024).

Excessive energy utilization has altered the climate and degraded the environment, driven by increasing air pollution and the presence of chlorofluorocarbons (Mohammed B. U. et al., 2023; Akinola et al., 2020). Globally, awareness of the consequences of climate change has increased due to the rapid depletion of natural resources and biodiversity (Adewale and Stephanie, 2022; Attia, 2016). Implementing energy conservation measures and reducing the carbon footprint of urban construction are emerging as important strategies to mitigate the adverse environmental effects of building emissions (Hachem-Vermette et al., 2019). In this regard, more than 60 countries have committed to attaining carbon neutrality by 2050 (Mohammed B. U. et al., 2023).

There has been a growing demand for sustainable architectural practices, leading to innovative reuse strategies, including the adaptation of shipping containers as building modules (Risnandar and Primasetra, 2021; Battaglia and Lee, 2020).

Since the shipping container was invented in 1956, it has remained a catalyst for globalization. These ISO-standardized shipping containers represent one of the biggest innovations in global maritime logistics, characterized by their uniform cuboid shape and modular sizes (Faragallah and Barakat, 2022). These standardized dimensions, typically 20-foot and 40-foot units (twenty-foot equivalent unit, or TEU), have been created explicitly as units for global interoperability and have been the main force driving the development of global trade. Containers are the backbone of the international maritime logistics systems (Faragallah and Barakat, 2022; Bitar et al., 2022; Costa et al., 2023). The reuse of old shipping containers as architectural structures has gained significant traction as a sustainable building material. In 2021, the number of twenty-foot containers increased by more than 851 million worldwide (Faragallah and Barakat, 2022; Bitar et al., 2022). Considering the high costs involved in storing, transporting, or destroying these containers, in addition to their non-degradable nature, it is urgent to develop strategies for the sustainable use of these decommissioned containers (Costa et al., 2023).

The intersection of container architecture and net-zero energy building (NZEB) objectives is particularly promising. The regeneration of existing buildings and abandoned areas is a key governmental and European objective, and the NZEB concept can be easily adapted to repurposed container structures to give new life to buildings whilst generating energy (Faragallah and Barakat, 2022). The concept has been applied to various programmatic needs, such as residential units, temporary disaster relief shelters, and educational facilities.

The reuse of steel shipping containers as structural elements and building envelopes to enable them to perform a specific function or host human activities is known as shipping container architecture (Costa et al., 2023; Fariña et al., 2024). Net-zero energy buildings (NZEBs) are buildings that generate as much energy as they consume. They have become a critical objective in the field of sustainable design, as shipping containers have proven to be a viable option for their implementation (Fariña et al., 2024).

However, meeting net-zero energy standards in shipping container architecture has been fraught with significant environmental, thermal, and operational challenges (

Attia, 2016

). The aim of this study is to evaluate various strategies that can transform shipping container architecture into NZEBs with a view to determining the most effective and sustainable approach for improved environmental performance in the four main Köppen climate classifications. To achieve the aim, the study provides insight into the characteristics of NZEBs through the following objectives, which include:

  • Analyze the most effective strategies for net-zero buildings and how they enhance environmental performance in shipping container architecture;

  • Evaluate parameters used in the qualification of net-zero energy buildings;

  • Investigate the feasibility of the implementation of net-zero strategies across residential building typologies; and

  • Examine case studies of existing net-zero shipping container architecture and curate their proven operational techniques.

The study is in line with three of the sustainable development goals, which include the seventh goal, by investigating the most efficient incorporation of renewable energy sources into shipping container architecture; the twelfth goal, which entails the adaptive reuse of shipping containers resulting in responsible consumption and production practices; and the ninth goal through the reforming of infrastructure to resource-efficient entities.

The study further contributes new knowledge by identifying the most prevalent net-zero energy strategies applicable in four Köppen Climate Classifications. The duration of the study was 15 months from November 2024 to March 2026.

2 Methods

2.1 General framework and research design

This study was conducted as a systematic literature review to rigorously identify, evaluate, and synthesize building energy performance strategies for retrofitting shipping containers into NZEBs. The general framework was carefully curated before screening scholarly articles to enhance reproducibility and transparency. In this regard, the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) framework was adopted. The four research questions of the study served as the basis for the review, aiming to evaluate strategies to transform residential shipping container architecture into NZEBs and to determine effective approaches for improved environmental performance across four Köppen categories.

2.2 Data collection sequence

A total of four academic databases, including Google Scholar, Elsevier Scopus, ScienceDirect, and SpringerLink, were utilized for a comprehensive exploration of the study’s theme. Although shipping container architecture began to gain visibility in the early 2000s, the selected publications were limited to journal articles published within the last decade, precisely between 2016 and 2026. This was implemented to critically examine the latest technological advancements in shipping container architecture and NZEBs. The following keywords were adopted while searching these databases: (“container architecture” OR “shipping container” OR “ISO container housing”) AND (“net zero” OR “low energy building” OR “NZEB”) AND (“energy performance” OR “thermal performance” OR “embodied carbon”). The search was conducted within the scope of international scholarly publications in English, peer-reviewed journal articles, and in the subject areas of architecture, building science, and sustainable development.

2.3 Criteria for inclusion and exclusion

At the first screening stage, to maintain consistency, the following criteria were used for inclusion:

  • Thorough exploration of the concept of net-zero performance strategies in buildings

  • Analysis of structures primarily built using shipping containers

  • Energy performance analysis through quantitative or qualitative approaches

  • Inclusion of data about embodied carbon in climate-specific documented case studies

  • Access to full text online with DOI identifier

The following criteria were strictly adhered to for exclusion at the second screening stage:

  • Absence of quantifiable performance indicators

  • Adoption of shipping containers as auxiliary building components

  • Use of performance modeling for purely conceptual design proposals

  • Scholarly articles from non-peer-reviewed sources and duplicates

  • Focus on maritime container applications without discussing architectural implementation.

A total of 985 publications, comprising conference proceedings, university theses, and technical reports, were found in the initial search. Manual cross-verification was then employed to eliminate duplicate entries in the selected databases. Based on the inclusion and exclusion criteria, the titles and abstracts were further screened to ensure their alignment with the study’s architectural scope. The methodological rigor and appropriateness of the full-text journal articles narrowed the final selection to 40 publications. The detailed adopted PRISMA framework is shown in Figure 1.

FIGURE 1

Four thematic clusters were adopted in this study to categorize the selected publications and facilitate a structured synthesis in line with this study’s aim and objectives, as seen in Table 1.

TABLE 1

S. No.Theme
1Regulatory frameworks for net-zero buildings based on policy criteria
2Passive design strategies, façade solutions, and novel energy-related architectural innovations
3Analysis of embodied carbon and lifecycle emissions of shipping containers
4Completed shipping container buildings with documentation on their energy performance

Study’s thematic clusters.

Source: Authors, 2026.

2.4 Corpus justification

The scope of this systematic literature review was limited by the principle of thematic saturation. By approximately the 40th article, the studies accessed failed to provide new information within the adopted framework, as all implemented net-zero strategies and performance data were already documented. Variations in geographic context were observed in the additional entries. However, this did not warrant inclusion of additional strategies within the selected thematic clusters.

The justification for a corpus would be insufficient solely based on thematic saturation in the absence of verifiable methodologies across all studies. Therefore, for performance-based claims to be substantial, empirical data had to be quantified and serve as the primary criterion in all scholarly articles. To reduce the risk of exclusion, a new search was conducted, and seven high-impact articles published between 2020 and 2026 were included.

2.5 Specific database search information

To properly represent emerging trends in net-zero shipping container architecture, the lower boundary date was set to January 2016, and the search encompassed publications through March 2026. The execution of the searches and the final export of the results occurred between 19 December 2024 and 20 December 2024. This two-day window was adopted to maintain temporal consistency within all four selected databases. An additional eight articles were sourced on 10 March 2026, and no subsequently published literature was included in this study’s scope, thus serving as the final systematic search. Table 2 shows the database-specific information for the four adopted databases.

TABLE 2

S. No.DatabaseDatabase-specific field filterParameters for search date
QualifierSubject area
1Google ScholarTitle; journal type: open access original article, conference paper, or literature review; written in EnglishEnergy, architecture, sustainability, and built environment2016–2026
2ScopusAbstract; keywords; title, journal type: original article or literature review; written in EnglishEngineering, energy, architecture, and civil engineering2016–2026
3Springer LinkTitle; journal type: open access original article or literature review; written in EnglishGreen buildings, sustainable architecture, and energy2016–2026
4Science DirectAbstract; keywords; title; journal type: original article, literature review, or conference paper; written in EnglishEnvironmental sciences, civil engineering, architecture, and engineering2016–2026

Database-specific information and parameters for search date.

Source: Authors, 2026.

2.6 Screening procedures

The principal investigator was responsible for designing the screening criteria and resolving all persistent conflicts during the full-text review. The other authors simultaneously carried out independent screening of all full-text titles and abstracts. Thereafter, all database search strings were validated by the third author, and reference lists were thoroughly reviewed by all authors. Rayyan’s automated detection was used to deduplicate all records obtained from the four databases, followed by double manual verification.

3 Results

3.1 Net-zero energy buildings

The terms “NZEBs” and “nearly zero energy buildings” (nZEBs) have often been used interchangeably in literature. However, it is pertinent to note that fundamentally varying concepts are represented by both terms in terms of approaches to implementation and performance goals (Ürge-Vorsatz et al., 2020).

NZEBs are buildings in which the annual energy use is estimated to match the amount of renewable energy generated on site (Khassan et al., 2021). This principle derives its basis from the annual energy balance offset by the total energy generated through on-site renewable sources and can be further subdivided into net-zero site energy buildings, net-zero emissions buildings, net-zero cost energy buildings, and net-zero source energy buildings (Perane et al., 2022).

Conversely, nearly zero energy buildings (nZEBs) describes buildings that are characterized by exceptional energy performance but do not attain complete energy balance annually, as the energy balance can be compensated through predominantly renewable energy (Kalaycıoğlu and Yılmaz, 2019). Fundamentally, the concept of nZEBs is derived from European regulatory frameworks, resulting in heterogeneous implementation approaches across member states (D'Agostino et al., 2022).

Table 3 presents a comparative summary of the classification criteria for NZEBs and nZEBs.

TABLE 3

S. No.CriterianZEBNZEB
1Annual energy balanceExceptional energy performance with leftover demands significantly covered by renewable energy sourcesThe energy produced annually equals or exceeds total consumption
2Origin of foundational policiesEuropean UnionGlobal standards from sources like the International Energy Agency (IEA) and North America
3Extent of regulatory adoptionThe legally binding threshold in the European Union since 2019Within most jurisdictions, it serves as the aspirational goal
4FlexibilityEncourages flexibility through the adoption of performance-based techniquesThe design is more constricted as a zero balance must be attained
5Renewable energy sources requirementsRemaining demand must be significantly met through renewable energy sourcesAnnual energy consumption must be fully offset using renewable energy sources
6ImplementationEasier to attain across climates and varying building typologiesIn certain climes, its achievability is more challenging
7Progressive positionTransition role to achieving NZEBsGlobal ultimate target

Criteria for classification as nZEBs and NZEBs.

Source: Authors, 2026.

In 2009, Belgium set the first definition for NZEBs. Subsequently, the definition has been revised to include emerging issues and improve on its shortcomings. Four definitions of the NZEBs have been acknowledged. They include net-zero energy, net-zero site energy, net-zero energy costs, and net-zero energy emissions (Shi et al., 2020).

NZEBs are achieved through low-carbon construction materials, energy efficiency techniques, and the adoption of renewable energy resources (Ürge-Vorsatz et al., 2020). A compound annual growth rate of almost 45% is predicted for NZEB construction and renovation (Ali et al., 2020). NZEBs can also refer to buildings that incorporate renewable technologies on a commercial scale and that use construction methods that consume no fossil fuels (Ali et al., 2020; AlAjmi et al., 2016; Kristiansen et al., 2019; Ohene et al., 2022).

Over the years, NZEBs have gained increasing popularity. This is evident in targets set by organizations such as the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), which seeks to fulfill NZEBs by 2030 (Shi et al., 2020). In NZEBs, there are two design strategies: reducing energy requirements in buildings through the implementation of energy-efficient measures and incorporating renewable energy and related technologies to meet energy demands (Ali et al., 2020).

The application of design strategies for NZEBs includes using efficient technologies that reduce building energy demand while utilizing renewable energy systems (Ali et al., 2020). The building’s energy requirements should be met primarily by on-site or nearby renewable sources. The net-zero strategies include reducing energy consumption through the adoption of energy-efficient devices, using efficient demand-side management to reduce energy demand, designing an energy-efficient building envelope to minimize cooling and heating loads, and selecting appropriate site-based renewable energy technologies for electricity generation.

In most cases, the energy generation of nZEBs is less than their energy consumption, due to seven principal factors identified by

Ohene et al. (2022)

. The factors are:

  • Overestimation and under-emphasis on passive strategies.

  • Hazy weather, which lowers the solar photovoltaics’ energy generation.

  • Lack of compliance with best practices and inaccuracy of technical construction.

  • Unplanned changes in the installation and usage of required equipment.

  • Wrong choice of pumps and control systems.

  • Adoption of inefficient components in active systems; and

  • Sliding fenestrations causing lower airtightness.

“Standards for NZEB design should be established that incorporate both energy efficiency requirements and occupant comfort criteria, thereby providing a consensus foundation for design recommendations.”

There should be set standards for NZEB design that include energy efficiency and occupant comfort criteria, providing a common ground on which to base design recommendations. For existing buildings, two design strategies are required for zero energy: reducing energy use within buildings (particularly heating and cooling systems) through energy-efficient measures and adopting renewable energy and related technologies to meet additional energy needs (AlAjmi et al., 2016). When on-site energy sources generate more energy than the building requires, the excess can be fed into the local grid (Ali et al., 2020). However, the realization of NZEBs is significantly impeded by the financial burden of unforeseen energy costs and the required initial investment.[23.2 Types of Net Zero Energy Buildings.

Kristiansen et al. (2019) identified four types of NZEBs: a site NZEB, a source NZEB, an emissions NZEB, and a cost NZEB. When a building on its site generates at least the energy consumed by its operation, it is known as a site NZEB. The distinguishing factor for a source NZEB is that primary energy is its metric. A building that generates sufficient renewable energy to cover all emissions through its net energy needs is called an emissions NZEB, while a building in which the owner has net-zero energy costs is known as a cost NZEB (Ohene et al., 2022).

Additionally, four categories of NZEBs exist with respect to renewable energy options (AlAjmi et al., 2016). The first category, known as the NZEB-A, refers to a building whose energy use is offset by renewable energy resources within its footprint. On the other end of the spectrum, the last classification, known as the NZEB-D, refers to buildings that combine on-site renewable resources with the purchase of off-site renewable energy credits to meet their energy needs (AlAjmi et al., 2016).

Based on its definition, attaining site NZEB status does not ensure that the building has been designed in an energy-efficient manner. The environmental impact of the building would be calculated using a carbon dioxide balance and primary energy requirements and compared with other design approaches (Ohene et al., 2022).

3.2 Parameters for Qualification as a Net-Zero Energy Building

There are four parameters a building must attain for it to be considered an NZEB:

3.2.1 Exceptional energy performance

The annual primary energy demand for residential buildings should be below 50 kWh/m2, while the maximum for commercial buildings is 60 kWh/m2. This is achievable using technologies, efficient design, and insulation (Jaysawal et al., 2022; Lin and Chen, 2022).

3.2.2 Renewable energy generation on site

The amount of renewable energy generated by the building should be equal to or exceed its annual basic energy demand. Popular renewable energy systems include solar PV and solar thermal (Koke et al., 2021).

3.2.3 Proven net-zero energy balance

By measurements and calculations, the building must demonstrate achieving a net-zero energy balance each year. This is achievable through the close observation of energy consumption and generation (Mandel et al., 2023).

3.2.4 Restriction on grid energy purchase

There is a limit on how much energy an NZEB can purchase from the grid, set at 15–30 kWh/m2 per year, as on-site renewable energy generation is encouraged (Mohammed B. U. et al., 2023).

The study by Mohammed B. U. et al. (2023) further indicates that newly designed buildings face challenges in achieving net-zero energy, and that it is increasingly difficult for existing buildings in high-temperature areas (Mohammed G. A. et al., 2023). Due to the significant discrepancy between the numbers of new and existing buildings, it is advisable to pay closer attention to converting existing buildings into NZEBs across varying climates.

Consideration should be given to energy exchange despite NZEBs being based on annual energy balance, utilizing grid infrastructure to overcome seasonal energy storage limitations, thereby reducing the grid interactions required to meet the target (Shi et al., 2020). Additionally, pertinent principles related to NZEBs include water and waste efficiency through greywater recycling and rainwater harvesting. Other principles include the integration of smart technology, which regulates energy consumption by installing sensors and automated algorithms.

3.3 Shipping container architecture

Evolving regulations and economic trends in the maritime industry have increased the demand for new shipping containers. However, failure to recycle these shipping containers led to environmental waste (Pomponi and D’Amico, 2020). Architects’ imaginations have been captured by the emergence of shipping containers as an alternative building material (Natanian et al., 2019). Although the pioneer of this innovation remains unknown, around the early 2000s, using shipping containers for homes became a focus in Europe and America (D’Agostino et al., 2022).

Container architecture, or “cargotecture,” is defined as buildings derived from steel intermodal containers (Costa et al., 2023; Laksitoadi and Syarif, 2020; Hassan et al., 2022; Alegbe, 2024). These containers, which are highly resistant to corrosion and oxidation, are usually created from COR-TEN steel (Hassan et al., 2022; Shahzad et al., 2024).

The functional adaptation of recycled shipping containers cuts across various spheres, from small family units to high-rise buildings (Berbesz and Szefer, 2018; El Messeidy, 2018). Carbon dioxide emissions can be reduced by approximately 43% when shipping containers are adopted, leading to higher energy efficiency and lower running costs (Hachem-Vermette et al., 2018). Shipping containers, due to their structural integrity, availability, and modularity, have emerged as a popular choice for sustainable construction (Attia, 2016). In coastal areas, shipping containers are an ideal standard convenience unit due to their weatherproof nature and characteristic quality (Thanekar et al., 2022). Their adoption also reduces reliance on traditional structural materials, thereby lowering embodied energy and construction costs. Carbon dioxide emissions are substantially offset by shipping containers while reducing natural resource use. Only 500 kWh are consumed during the recycling and upcycling of shipping containers, whereas disposing of a single container costs approximately 8,000 kWh (Hassan et al., 2022). An energy-efficient building envelope for shipping containers can be achieved by adopting high-performance fenestrations, airtight construction, thermal insulation, and appropriate shading devices to manage solar heat gain (Hachem-Vermette et al., 2019).

There are concerns about the suitability of shipping containers for structural stability and habitability (Berbesz and Szefer, 2018). According to D'Agostino et al. (2022), not all countries currently accept the potential use of containers. This is evident in Spain, which has raised concerns regarding their inherent uncertainties and refuses to acknowledge their viability. Also, Malaysia prioritizes using shipping containers as storage facilities rather than housing units (D'Agostino et al., 2022). Glass facades are a common feature of shipping container architecture, enhancing aesthetics and providing external views. This method is fraught with problems, including overheating and excessive sun exposure (Ibrahim et al., 2024).

Another significant drawback of a shipping container building is its steel-box-like features, which create an uncompromising aesthetic and make the construction’s end product appear to prioritize form over its function as a building (Zafra et al., 2021). There is, however, a potential solution to this: combining, arranging, and creatively composing the units to create a unique architectural feature. Currently, research is centered on improving the thermal performance of shipping container buildings (Hachem-Vermette et al., 2019).

According to Ibrahim et al. (2024), Costa et al. (2023), and Hassan et al. (2022), shipping containers can be used as single-family units, multi-family units, dormitories, youth centers, hotels, mobile healthcare centers, libraries, classrooms, emergency shelters, and several other building or structure types.

3.4 Net-zero strategies in shipping container architecture

Although many shipping container buildings exist globally, their energy efficiency within changing climes has been underexplored. When designed as NZEBs, shipping container architecture plays an important role in attaining the target of a “climate-neutral building stock” (D’Agostino et al., 2022). According to Elrayies (2017), passive and active net-zero strategies can be implemented into shipping container architecture. The passive strategies include optimal building geometry, building façade design, natural lighting, and natural ventilation. In contrast, the active strategies are the incorporation of renewable energy sources (PV, solar thermal, geothermal, and wind turbine) and backup systems for renewable energy (Radwan, 2015; Shi et al., 2020; Elrayies, 2017).

When meeting passive design standards, a significant drawback of container architecture is the lack of insulation, which leads to high thermal discomfort. To ensure habitability, insulation is mandatory, as it reduces mechanical cooling system loads and increases thermal resistance. Some viable insulation materials include extruded polystyrene (XPS), rock wool, polyurethane, and high-performance vacuum insulation panels (HVIP) (Lin and Chen, 2022; D'Agostino et al., 2022; Berbesz and Szefer, 2018). Structural insulated panels (SIPs) can be an alternative to traditional insulation materials as they consist of oriented strand board (OSB) plates fitted with a polymer foam insulation core (Hassan et al., 2022).

Improved façade design can be utilized to reduce energy consumption, and its role is more pronounced in shipping container architecture with highly glazed envelopes, which have a significant effect on the thermal load (Ibrahim et al., 2024). During the initial design stage, incorporating shading devices is an efficient way to reduce mechanical cooling energy requirements. Solar gains in warm-climate zones can be effectively mitigated by fixed external shading devices. The energy performance of a shipping container building can be improved by incorporating vertical or horizontal shading devices based on the façade’s orientation and environmental conditions (Lin and Chen, 2022; Ibrahim et al., 2024). A recently introduced shading system, hybrid louvers, features vertical and horizontal louver characteristics that optimize energy efficiency in multiple directions.

3.4.1 Building orientation and shape

Twice, the solar radiation along the north and south sides of a building hits its west and east surfaces; therefore, situating fenestrations with large sizes along the west and east axes should be avoided (Haque et al., 2021). To reduce heat loss and material use, compact building volumes are ideal. Shipping container wall surfaces have a much larger area than the floors. The negative effects of this large surface area are reduced when the building is properly insulated. Although overheating may be a problem when the environmental temperature is high, this can be overcome by finishing the container’s exterior with a white or light color to increase reflection and reduce heat absorption. Passive cooling is also enhanced by locating internal spaces with higher heat gains on the north side of the building (Ohene et al., 2022).

3.4.2 Insulation

In colder climates, insulation is considered a cost-effective measure, whereas in buildings with sizeable internal heat loads, it is less cost-effective. Buildings with a dominant cooling load can use insulation to prevent heat loss during cooling. Currently, two insulation materials with highly positive results are vacuum insulation panels (VIP) and aerogels, but their soaring prices limit their applicability (Ohene et al., 2022). Furthermore, the stack effect occurs due to air circulation within raised-ridge roofs. Therefore, air is one of the most effective insulators for pitched roofs (Haque et al., 2021).

3.4.3 Electrochromic windows and photovoltaic glazing

The only available technology that permits dynamic control of transmittance through windows is electrochromic windows. They can harness sunlight to its maximum even in their transparent state, thus achieving optimal visible transmittance. The marketing of this glazing technology, however, is limited by factors such as cost, color rendering issues, and switching time. Aside from electricity generation, photovoltaic glazing is an innovative technology that can also reduce energy consumption for cooling, heating, and artificial lighting. Light transmission can also be reduced using semitransparent or translucent photovoltaic technology (AlAjmi et al., 2016; Ohene et al., 2022; Jaysawal et al., 2022).

3.4.4 Passive heating and cooling techniques

Cooling internal spaces through natural ventilation can be greatly improved by installing automated fenestrations. The control system for NZEBs should increase cooling and heating loads when excess electricity is generated/harnessed. It should also lower its threshold for using stored heat in the thermal mass during an electricity shortage (Jaysawal et al., 2022).

3.4.5 Active heating and cooling

The most common active heating system in NZEBs is heat pumps, as the high electricity demands of buildings make them more cost-effective. Although characterized by relatively high investment costs, heat pumps have lower operating costs because they meet almost 95% of heating energy needs (Jaysawal et al., 2022).

3.4.6 Energy-efficient ventilation

Indoor temperatures closely track the diurnal and seasonal variations in external temperatures in naturally ventilated buildings. Indoor thermal environments can be improved in an energy-efficient manner by adopting natural ventilation. A direct linear correlation exists between window use frequency and environmental temperature (Jaysawal et al., 2022).

3.4.7 Renewable energy supply

On-site energy generation can be achieved through wind power, solar thermal, or photovoltaics.

  • Wind power

This method has been limited to a few specific cases due to the minimum required wind speeds and the noise associated with wind turbines. It is, therefore, more suitable for a group of buildings that can be linked to a nearby wind farm. Its safety, vibration, and local turbulence issues raise concerns, thereby reducing the likelihood that it will replace or complement photovoltaics (

Ohene et al., 2022

).

  • ii. Solar thermal

Among the renewable energy technologies, solar thermal systems have the highest installed capacity. Tap water is heated by 89% of solar collectors, with an annual system efficiency of 30%–40%. Flat-plate collectors are cost-effective and have a long lifespan due to their low operating temperatures. Passive preheating of outside air using transpired solar collectors is a cost-effective technique. However, the size and weight of solar collectors pose a problem for shipping container homes (

Ohene et al., 2022

).

  • iii. Photovoltaics/thermal

This lowers the temperature of the solar cell and maximizes the hot water produced by the excess heat generation. Overall efficiencies of greater than 70% can be attained with photovoltaic/thermal systems, with electrical efficiencies of 15%–20% and thermal efficiencies exceeding 50%. The lifespan for these systems is a minimum of 20 years (Ohene et al., 2022).

3.4.8 Storage of renewable energy

The electrical system for off-grid systems can be balanced in three main ways: energy storage, demand response, or connection to buildings within a microgrid. In nZEBs, where the power generated is less than the load, some form of energy storage is necessary to maintain building operation. During peak hours, self-consumption can be increased and energy costs reduced by storing energy.

3.5 Case studies of shipping container architecture and their net-zero strategies

There are many significant net-zero architectural designs globally, such as the Freitag Flagship Store, the Bullitt Center, which is commonly referred to as the world’s greenest commercial building, and the Beddington Zero Energy Development (BedZED), which has energy-efficient homes that constitute an eco-village. However, for the purpose of this study, six shipping container buildings that have successfully integrated net-zero strategies into their design are examined. They include Keetwonen, The Flying Box, Casa Oruga, London Trinity Buoy Wharf’s Container City projects 1 and 2, The Boulder, and Heartland Housing.

To address the identified gap in the literature, this study selected six case studies globally using a clearly defined, reproducible approach to ensure proper representation of real-world shipping container architecture contexts. These criteria are listed and explained in Table 4.

TABLE 4

S. No.CategorySelection criteriaDescription
1Mandatorya. Building typology
  • i. Primary classification as a residential building within the confines of studio apartments, multi-level residences, transitional housing units, and large-scale housing developments

  • ii. Certain typologies, such as commercial and industrial, were strictly excluded due to non-negligible discrepancies in their occupancy patterns and thermal load

b. Primary structural component
  • i. The habitable floor area must be within the envelope, or the structure must be defined by at least 60% ISO standardized shipping containers

  • ii. Due to the peculiar structural and thermal properties of shipping container architecture, buildings that were merely clad with containers as an aesthetic function were not included

c. Evidence of implemented net-zero strategies
  • i. At least one net-zero energy strategy must be implemented within the building, including passive design, thermal insulation, natural ventilation, renewable energy generation, and smart energy management systems

  • ii. Prioritization of the adoption of multi-technique energy-saving approaches over singular retrofits

d. Availability of energy or carbon performance records
  • i. Verified documentation of the building’s energy performance over the span of greater than 180 days

2Authors’ discretiona. Representation of climate zones
  • i. Distribution across at least two Köppen climate classification zones, with higher priority for tropical locations

b. Legal restriction(s)
  • i. Exclusion of buildings where non-disclosure agreements restrict access to construction documentation and those currently undergoing legal proceedings

c. Project timeline
  • i. Shipping container buildings completed within the last decade were strongly prioritized due to the evolutionary advancement of automation technologies and insulation materials

  • ii. An exception will be given to shipping container architecture that depicts groundbreaking applications and methodologies

Selection criteria for case studies.

Source: Authors 2026.

3.5.1 Keetwonen, Amsterdam

The use of shipping containers as an efficient net-zero housing solution is exemplified in this unique project. Aside from its practical contribution to reducing the carbon footprint, the project also revitalizes urban space through its functionality and aesthetics. Renewable energy integration and energy efficiency are the key strategies implemented in Keetwonen.

These strategies were achieved by incorporating high-level insulation and energy-efficient appliances, thereby greatly reducing the overall energy consumption of a single housing unit (Bernardo et al., 2022). Additionally, the materials and construction techniques were carefully selected, making the project both environmentally friendly and functional. The roofs of the container units are equipped with solar panels that generate electricity. This approach greatly limits the use of fossil fuels. Smart grid technologies are also integrated into this facility to enable effective energy management through real-time monitoring and optimization of residents’ energy use (Bernardo et al., 2022).

3.5.2 The flying box, France

The use of shipping containers for this project was primarily due to size and budget constraints. After prefabrication off-site, the entire structure was assembled in only 3 months. The main volume consists of two glass facades, which allow for natural lighting and reduction of reliance on mechanical ventilation (Battaglia and Lee, 2020).

A large roof terrace, planted with trees and other greenery, is located on the top level of this building, helping to control internal temperature while serving as an effective stormwater management technique. Heat transfer through the roof is also significantly reduced by the natural insulation provided by vegetation (Battaglia and Lee, 2020).

3.5.3 Casa Oruga (Caterpillar House), Santiago, Chile

Utilizing only 12 shipping containers, this project by Sebastián Irarrázaval exemplifies the adoption of passive cooling in shipping container architecture (Oh et al., 2017). To deliberately blend the building with its environment, an unconventional internal layout was adopted. This arrangement facilitates the influx of cool, natural air from the surrounding mountains into the building’s envelope through fenestrations and a ventilated façade. When choosing the material palette, low cost was not the sole priority; consideration was also given to low maintenance and long-term performance (Oluwatayo and Pirisola, 2021).

Table 5 shows the net-zero strategies, energy performance, and lifecycle assessment of the six selected case studies.

TABLE 5

S. No.ProjectLocationNet-zero strategiesEnergy performance and lifecycle assessment
1KeetwonenAmsterdam, Netherlands
  • • Insulation using closed-cell spray polyurethane foam (ccSPF)

  • • Natural ventilation

  • • Photovoltaic panels integrated into the flat roofs

  • • Rainwater harvesting

  • • Solar-control coated double-glazed units

  • • 90% of the construction processes occurred off-site due to its prefabrication, which lowered the project’s carbon footprint by 70%

  • • Production of scrap metal from a shipping container by melting is achieved using 8,000 kWh of energy. However, Keetwonen utilized only a quarter of that to create openings and undertake retrofitting

2The flying Box (La Maison Conteneur)Orgères, France
  • • External insulation system to prevent thermal bridging

  • • Band windows for daylighting

  • • Roof integration with photovoltaics

  • • Rainwater harvesting

  • • The structural reuse of five shipping containers accounts for an estimated saving of 37 tonnes of carbon dioxide

  • • The walls have a U-value of approximately 0.20 W/m2·K through the adopted external insulation material, which outperforms local regulations

3Casa Oruga (Caterpillar House)Santiago, Chile
  • • Passive cooling

  • • Ventilated rainscreen façade

  • • 65% reduced upfront emissions due to low-impact integration with the building’s site

4Container City 1 & 2Trinity Buoy Wharf, London, UK
  • • Internal insulation

  • • Passive solar design

  • • Integration of photovoltaics (PVs)

  • • Not quantitatively documented within the perused literature

5The BoulderColorado, USA
  • • Passive solar design

  • • Natural ventilation

  • • Reduced “kilowatt-hours per square foot” metrics due to high-performance glazing and passive cooling

6Heartland HousingFort Saskatchewan, Alberta
  • • High-performance insulation systems

  • • Passive solar design (fenestration, building’s form, and orientation)

  • • Adoption of hybrid ventilation strategies results in 83% of net energy use

  • • The entire structure’s electricity use is offset by 100% due to the extensive array of solar panels

Appraisal of case studies.

Source: Authors, 2026.

3.6 Summary of findings from literature

Table 6 summarizes the most pertinent information from the 40 articles utilized for the study’s systematic literature review for easy understanding. The information provided includes the title, authors, year of publication, objectives, methods, results, and gaps identified in each study.

TABLE 6

S. No.Author(s)Aim/ObjectivesMethodResultGap
1Shi et al. (2020)Demonstration of the possibility of converting a public building into an NZEBQuantitative
  • i. Energy-efficient measures (EEMs) save approximately 1,480 MWh annually

  • ii. Energy savings and efficiency are increased through the integration of solar energy systems

  • i. No consideration of climate variability impacts on energy performance

2D'Agostino et al. (2022)Evaluation of the projected thermal comfort and energy efficiency within shipping container homes in the 2080sQuantitative
  • i. Significant thermal discomfort would be experienced within container homes without intervention, with residents experiencing discomfort hours when temperatures exceed 28 °C

  • ii. Energy consumption decreases by 76% with proper insulation

Limited generalizability to regions with different climates and a lack of surrounding environmental features in simulation models
3Radwan (2015)Investigation of the various passive and active design systems and their computational potential in Jordanian residential buildingsMixed methods
  • i. Optimal energy strategies can achieve near-net-zero energy buildings

  • ii. Energy performance improvements can minimize national electrical consumption

Lack of long-term performance evaluation of implemented strategies
4Dobbelsteen et al. (2019)To explain the theories behind global net-zero emissions and document the evolution of the net-zero carbon dioxide emissions conceptMixed methodsNet-zero CO2 emissions are essential to halt global warmingNo discussion of the sustainable interventions in nature-based solutions
5Eneh and Eneh (2022)Review, identification, and categorization of previous Solar Decathlon competitions and their innovationsQualitative
  • i. Innovations focused on HVAC and home automation systems

  • ii. Architectural innovations emphasized adaptability, façade, and building materials

  • i. No assessment of the cost-effectiveness of implemented technologies

  • ii. Insufficient focus on the long-term sustainability of innovations

6Hassan et al. (2022)Architectural pro-environmental usability of shipping containers in Poland and worldwideQualitative
  • i. Containers can withstand extreme conditions and have a long lifespan

  • ii. Shipping containers are innovative for residential and public buildings

  • i. Lack of case studies on container use in disaster relief

  • ii. The article does not address the long-term sustainability of container buildings

7Zafra et al. (2021)To understand the construction system of refurbished shipping containersQualitative
  • i. Modular coordination simplifies project development from planning to construction

  • ii. Refurbished shipping containers support sustainable construction systems

  • i. The article does not address aesthetic improvements for container buildings

  • ii. Lack of detailed case studies on container housing implementations

8Ürey (2023)Comparison of the environmental effect of a container dwelling with similar structures made of steel and X-LamQuantitative
  • i. Easy reclamation of shipping containers as structural materials that have lesser construction periods

  • ii. Container structures reduce global warming potential by 20–26 tons of carbon dioxide

  • i. Further research is needed on real case scenarios

  • ii. Exploration of specific data for operational energy use is required

9Allen et al. (2022)To analyze the energy impacts of new NZEB regulations and to assess emissions reductions from building renovationsMixed methods
  • i. At least 55% of heating demands are reduced by regulation

  • ii. Energy consumption reduced to 5–13 kWh/m2/year with systems

  • i. Insufficient exploration of future technological developments

  • ii. Limited focus on new building construction trends

10Alegbe (2024)Adapting shipping containers into sustainable architectural solutions and gathering units on siteQualitativeHousing shortages can be addressed by shipping containers due to their minimal environmental impactThe long-term viability of shipping container architecture and how its aesthetics can be improved was not assessed by empirical studies
11El Messeidy (2018)Addressing the increasing interest in the reuse of shipping containers due to their environmental benefitsQualitativeThe operational phase of container based buildings (CBBs) has a significant impact on their overall life cycle, regarding energy consumption and environmental footprintDue to the scarcity of studies focusing on the shipping containers’ thermal performance across different climes, more comprehensive research is required to validate the findings
12Baghi et al. (2021)Exploration of the innovative architectural solutions of shipping containers for student housingQualitativeShipping containers have the potential to contribute to sustainable urban development by minimizing construction waste and utilizing low-cost materialsInability to explore the integration of advanced technologies in container architecture to increase energy efficiency
13Bertolini and Guardigli (2020)Addressing the pertinent affordable housing problem through the innovative use of shipping containersQualitative
  • i. Compared with traditional methods of construction, shipping containers are a viable alternative

  • ii. Adherence to proposed design guidelines can provide housing solutions that are affordable and aesthetically pleasing

Discussion of the adaptation of shipping containers in urban design without providing empirical evidence from successfully implemented real-world case studies
14Hachem-Vermette et al. (2018)Investigation of the potential of utilizing shipping containers to achieve net-zero energy performanceQualitative
  • i. Implementing additional efficiency measures and strategies of solar design can lower thermal load in shipping containers by 72%

  • ii. A net-positive energy status can be achieved through the integration of photovoltaics along roofs in the south direction

  • i. It mainly focuses on energy efficiency without properly addressing other areas of sustainability

  • ii. The long-term performance of shipping container architecture under varying climates was not discussed

15Cerezo-Narváez et al. (2021)Exploration of the potential of a solar mixed-use community that uses residential and commercial structures to attain net-zero energy statusMixed methods
  • i. Approximately 70% of the total energy consumption of a neighborhood can be generated by energy efficiency measures alongside PV systems

  • ii. A net-positive energy status and high-performance neighborhood can be attained by adopting thermal collectors and seasonal storage

No focus on particular criteria that are needed to optimize the performance of solar collectors and storage systems
16Thanekar et al. (2022)Addressing the housing challenges of coastal areas through shipping container housing as a sustainable construction solutionQualitative
  • i. Embodied energy is significantly reduced by upcycled shipping containers compared to traditional building materials due to their efficiency

  • ii. Their inherent strength makes them suitable for coastal environments

Absence of practical application of shipping containers in varying contexts from the selected literature
17Ibrahim et al. (2024)Using hybrid louver systems to enhance energy efficiency in buildings constructed with shipping containersMixed methodsEnergy performance can be significantly improved by using hybrid shading systems while considering building orientationsNeed for optimization of the application of hybrid shading systems in varying architectural contexts
18Ali et al. (2020)Provision of a comprehensive overview of NZEBsQualitativeNZEB solutions cost approximately 30% more than conventional construction, suggesting that current NZEB standards may not be financially viable for widespread adoption
  • i. Lack of focus on the socio-economic parameters that affect the implementation of NZEBs

  • ii. No empirical studies for the evaluation of the extended performance of NZEBs in developing areas with different standards of energy efficiency

19Kristiansen et al. (2019)Exploration of the effectiveness of the use of shipping containers as NZEBs across various climatic conditionsQualitativeNZEBs can be effectively achieved using shipping containers when the right insulation, ventilation, and renewable energy technologies are included and designed according to each specific climateNo investigation into the economic viability of shipping containers of NZEBs with respect to traditional methods of construction
20Ohene et al. (2022)Exploration of the role of shipping containers in energy efficiency and renewable energy integrationQualitative
  • i. A discrepancy exists in buildings’ simulated and actual energy needs, particularly concerning heating and cooling

  • ii. The inclusion of user-friendly energy management systems is recommended to increase efficiency

No review of empirical studies to authenticate the theoretical models and assumptions currently prevalent in the field
21AlAjmi et al. (2016)Enhancing understanding of NZEBs and the validation of their efficacyMixed methodsIn theory, NZEBs are an efficient solution for the reduction of buildings’ energy consumption; however, variations exist in simulated and real-world usage of energyThe operational stage of NZEBs was not included for a proper insight into the effect of unpredicted operational challenges on energy performance
22Grębowski (2026)Evaluation of the potential of adopting shipping containers in post-disaster scenarios as transitional sheltersQualitativeWhen properly oriented and landscaped, shipping containers offer comparable thermal performance to traditional buildingsThe study did not provide insights into any building codes specific to the design and construction of shipping containers
23Mohammed B. U. et al. (2023)Exploring the transition to NZEBs and the need for sustainable energy solutions in the context of sub-Saharan AfricaQualitativeOptimization of the building orientation maximizes solar gain, and the effective insulation tailored to the local climate helps to control energy consumptionInsufficient empirical data on the performance of NZEBs in tropical climates that can improve design and implementation strategies
24Elrayies (2017)Evaluation of innovative approaches for minimizing greenhouse gas emissionsQualitativeGreen roofs, proper building orientation, and geometry can be implemented to reduce indoor temperatures, which is necessary for minimal cooling energy requirementsLimited focus on the synergy between passive and active strategies in NZEBs implementation
25Ohene et al. (2023)Examination of building professionals’ perception regarding net zero carbon buildings (NZCBs) within an emerging marketQualitative
  • i. The most significant challenges in adopting NZCBs are economic and financial constraints

  • ii. The adoption of NZCBs is hampered by the uncertainty of numerous stakeholders about the economic viability and demand for such projects

Exclusion of empirical research on NZCBs that focuses on the experiences of newer stakeholders
26Ohene et al. (2023)Identification of the barriers to achieving NZCBs and the development of strategies for mitigating themMixed methodsThe barriers that limit the progress of NZCBs include high initial costs, insufficient government support, and low stakeholder involvementNo effective mitigation techniques were explored for the identified barriers to NZCBs
27Ürge-Vorsatz et al. (2020)Comprehensive exploration of the advancements in research related to net-zero energy buildings (NZEBs)Mixed methods
  • i. The design phase of NZEBs has remained the primary focus of existing research while neglecting their operational aspects

  • ii. Residential buildings have been the focal point of NZEBs, with commercial buildings having a lower priority despite their high carbon emissions

Lack of insight into the relationship between stakeholders and the operational performance of NZEBs
28Costa et al. (2023)Exploration of the potential of shipping containers for the construction of functional spacesQualitative
  • i. Sustainable building practices can be incorporated into shipping container architecture

  • ii. Container architecture has the potential to provide quick and temporary housing solutions

The case studies presented may not fully represent the broader spectrum of problems in varying environments
29Hachem-Vermette et al. (2019)Analysis of the current challenges and opportunities of NZEBs across various national contextsQualitative
  • i. Clear definitions and standards must be established for NZEBs due to the existence of an unclear array of labels

  • ii. Inadequate regulations pose a barrier to the implementation of effective net-zero strategies

Although a thorough analysis of national methods of attaining NZEBs was conducted, the variations of each nation that could affect the effectiveness of the strategies were not fully addressed
30Ling et al. (2019)Evaluation of the environmental performance of various houses with a focus on conventional, low-energy, and net-zero energy designsMixed methodsNet-zero energy design significantly outperforms the conventional and low-energy designs by exhibiting the lowest lifecycle greenhouse gas emissionsAdoption of global databases for data collection that may not include the required local context and specificities
31Satola et al. (2022)Exploration of the application and advantages of shipping container architecture in cold climatesQualitativeReduced construction cycle, savings in material, lesser energy consumption, and adaptability to diverse sites are some of the benefits that shipping containers offerIt requires more insight into the environmental impact of shipping container architecture using lifecycle assessments and sustainability metrics
32Ürge-Vorsatz et al. (2020)Exploration of the advancements and challenges of attaining NZEBs and the implications of transitioning into such structuresQualitative
  • i. The inclusion of renewable energy technologies and the adoption of energy-efficient designs can substantially reduce operational energy use

  • ii. Retrofitting existing structures comes with technical difficulties that have prevented the widespread adoption of NZEBs

Lack of detailed analysis on the lifecycle assessment of different materials adopted in NZEBs, especially their embodied energy and carbon footprint
33Satola et al. (2020)Assessment of the strategies that can be adopted to attain net-zero energy consumption in residential buildingsQualitativeAttaining NZEB status requires a multifaceted approach that requires the combination of high energy efficiency measures with renewable energy generationNo in-depth inquiry into the long-term performance and reliability of NZEB technologies, especially in different climatic conditions
34Suo et al. (2023)Evaluation of freight container housing within subtropical climates as sustainable building solutionsQuantitative
  • i. For effective energy-saving, key design variables like insulation cannot be underemphasized, as thinner insulation materials with a thickness of less than 90 mm perform better

  • ii. Airtightness of junctions and edges can be considerably enhanced through sealing junctions and edges

Lack of in-depth analysis on the long-term performance of shipping containers in other climates
35Pinilla-Melo et al. (2025)Exploration of the conversion of shipping containers into habitable units with a focus on structural and thermal performanceQuantitativeCurrent designs adopted in shipping container architecture are prone to significant fluctuations in room temperature and humidity levels, which affect the thermal comfort of usersNo proposed solution to the identified heat transmission due to the inherent structural configuration
36Moura et al. (2024)Assessment of the thermal behavior of green roofs and their impact on indoor coolingMixed methods
  • i. Unlike conventional roofing systems, heat conduction was prevalent along the sides of walls and the slab, causing upward heat transfer

  • ii. Green roof modules used 75% less energy during warm temperatures and used more energy in cold seasons to heat the internal envelope

The long-term effectiveness of the green roofs’ seasonal thermal performance was underexplored
37Milovanović et al. (2022)Proffering a lightweight steel frame wall structure for enhanced Croatian NZEB requirementsMixed methods
  • i. Steel studs in shipping containers increase the U-value, causing greater transmission losses

  • ii. Thermal bridges can be mitigated through the protection of metal studs with thermal insulation, leading to Ψ-values significantly less than 0.1 W/(m•K)

There was no exploration of how design strategies can be optimized for increased energy efficiency
38Liang et al. (2024)Examination of thermal performance to identify the main factors driving energy consumption in shipping containersQuantitative
  • i. 50% of the total energy consumption was accounted for by windows, thermal bridges, and air infiltration

  • ii. Implementation of thermal bridge insulation and external louvers can lower energy consumption by 25.9%

Outdoor climatic conditions were acknowledged to have affected user thermal comfort; however, no practical solution was provided
39Figaj et al. (2024)Evaluation of the energy efficiency of shipping container architecture within 30 European locations to assess their performanceQuantitative
  • i. Strong correlation between energy efficiency and regional climatic characteristics

  • ii. Calculation of thermal loads was simplified through the establishment of empirical correlations for advanced energy assessment

Lack of a comprehensive analysis of the configuration and stacking of shipping containers on overall energy efficiency
40Costa et al. (2023)Identification of urgency in repurposing more than 17 million retired shipping containers for varying demographicsQuantitativeThere was a 22.86% total energy savings when mineral wool was adopted as the thermal insulationThe effect of exterior façade treatments on the thermal performance of the shipping containers was not considered

Summary of systematic review literature.

Source: Authors, 2026.

The data in Table 1 reveal that the common gap in the selected literature is the lack of comprehensive data on the energy performance characteristics of shipping containers and the absence of an extended evaluation that assesses the long-term viability of shipping container architecture. The enhancement of energy efficiency through the implementation of advanced technologies is an area that is yet to be comprehensively explored. There is also a lack of an in-depth exploration of the efficacy of NZEB technologies across varying climates and how to enhance their operation in hot, humid climates.

3.7 Thermal bridging in steel intermodal modular connections

Steel has a thermal conductivity (L) of approximately 50 W/m·K, which is dramatically higher than that of timber (approximately 0.12 W/m·K) and mineral wool insulation (approximately 0.035 W/m·K) (Li et al., 2023). The difference between steel and everyday insulating materials, which is approximately three orders of magnitude, implies that any unbroken elements of steel within the building envelope constitute a preferential conduit of heat flow, or thermal short-circuit, that can make the nominal U-value of an insulated wall panel very dependent at junctions. The thermal bridging phenomenon in steel-framed buildings is not a novel concept. The literature confirms that the high thermal conductivity of steel framing elements is one of the most significant obstacles to meeting the thermal performance targets necessary to achieve energy-efficient, virtually NZEB buildings (Li et al., 2023; Qi et al., 2024; Tkalčić et al., 2023; Santos et al., 2023).

3.7.1 Areas prone to thermal bridging in shipping container architecture

A combination of two containers stacked or placed at right angles and welded produces the most frequent modular connection detail, a continuous steel pathway of very high conductance along the entire height and width of the junction. The reason is that the connection, which is usually made between the corner castings, corner posts, and/or rails of the neighboring containers, is the welding between them forming a continuous steel thermal bridge that cuts through the insulation system installed on the individual containers (Curto et al., 2022).

Studies of modular building connections have recorded a number of inter-module connections that are applied in practice. The evolved corner fittings of shipping containers are known as corner fitting connections, in which brackets formed at the corner of modules are made of strengthened steel (Curto et al., 2022; Rajanayagam et al., 2021). Side plates or connector plates are single bolted in adjacent modular units with corner columns or angles. The inter-module connection commonly used is the corner bracket type that highlights the common way of connecting one module to another, and these interconnections have been shown to have significant structural implications (Tkalčić et al., 2023; Curto et al., 2022).

The bonding that was developed based on the corner fitting connections of shipping containers has an enhanced corner bracket in the intersection of the intra-beam to intra-column. The stacked modules can have vertical links that deliver a shear key or plug that aids in positioning modules, as well as giving a structural bond where a physical connection is not feasible or practical. These joints are meant to be very efficient in responding to varying loads, and high-strength friction grip bolts are usually utilized (Rajanayagam et al., 2021). However, all types of connections establish a direct steel-to-steel interface, which is a thermal bridge of the highest order.

3.7.2 Thermal bridging mitigation strategies and limitations

Table 7 presents four approaches that can be effectively adopted to minimize or prevent thermal bridging in shipping container architecture.

TABLE 7

S. No.Mitigation strategyRecommendation(s)
1Exterior insulationApplication of a 50-mm expanded polystyrene insulation (EPS) layer to the exterior wall to attain a reduction of thermal transmittance by 45% (Carramiñana et al., 2024)
2Composite connectors and thermal break materialsA 12% decrease in U-value from 1.55 W/(m2·K) to 1.47 W/(m2·K) can be achieved by substituting steel reinforcement window sash and frame with pultruded thermoplastic composite reinforcement (Minchenkov et al., 2025)
3Enhanced junction designDevelopment of the insulation strategy in such a manner that the steel frame must be placed in the middle of the insulated assembly, instead of in the inner or outer aspect (Makaveckas et al., 2020)
4Optimization through simulated numerical analysisAssessment of geometric data, defining material properties and boundary conditions, creating a mesh inside an element, heat transfer calculation with finite element analysis using 3D models (Brzyski et al., 2022)

Thermal bridging mitigation strategies and recommendations.

Source: Authors, 2026.

4 Discussion

This study’s findings reveal that shipping container architecture offers quick construction solutions and proffers excellent designs for temporary housing while lowering embodied energy due to upcycling. However, it costs approximately 30% more than traditional building construction when integrated with net-zero strategies (Ali et al., 2020). These high costs, although present at the initial stages, are negligible when compared to the cost incurred during the operational phase, which includes the maintenance of renewable energy systems. Technical difficulties and a lack of the required expertise for retrofitting existing shipping container buildings into NZEBs have also been significant drawbacks. This has led to NZEB standards not being adopted on a large scale due to their financial viability. Uncertainty of numerous stakeholders regarding the economic prospects of NZEBs and the lack of established standards have also led to a decline in their demand.

In terms of their effectiveness, the net-zero strategies that have improved the environmental performance of shipping container architecture are building orientation, insulation, passive cooling, and renewable energy technologies (AlAjmi et al., 2016; Kristiansen et al., 2019; Ohene et al., 2022; Haque et al., 2021). However, their effectiveness depends on an appropriate design according to the specific climate. The implementation of additional solar design strategies also lowers the overall thermal load of shipping container architecture by 72% (Cerezo-Narváez et al., 2021). For increased efficiency, existing research highly recommends that user-friendly management systems be included in shipping container architecture. The lowest lifecycle greenhouse gas emissions are also exhibited by net-zero shipping container architecture.

Net-zero shipping container architecture is innovative for residential and commercial buildings within tropical regions. Their characteristic strength allows them to withstand extreme conditions and provides a longer lifespan. This improves their thermal performance, as tropical regions are fraught with challenges like rising temperatures and high humidity. Solar heat gain can be effectively mitigated by optimizing building orientation, using green roofs, and installing high-performance insulation materials like vacuum insulation panels (VIP) and aerogels (Ohene et al., 2022). This contributes to sustainable urban development and serves as a sustainable modular construction system.

Table 8 provides an operational framework for the conversion of shipping containers to NZEBs.

TABLE 8

S. No.Applicable climateNet-zero strategyImplementationExpected outcomes
1Cold climate (Köppen Dfc, Dfb)
  • • Airtight envelope with adequate insulation with U-values of approximately 0.23 W/(m2·K) or less

  • • Vacuum insulation panels (VIP) to replace conventional insulation in constrained spaces

  • • Appropriately minimized window-to-wall ratio fitted with 20-cm-thick wall insulation

  • • Total energy consumption reduction to 36%

  • • Reduction of annual heating demand by almost 40%

  • • Triple-glazed fenestration filled with inert gases like argon or krypton

  • • Window-to-wall ratio

2Hot-arid climate (Köppen BWh)
  • • Passive cooling

  • • Introduction of rooftop photovoltaic shading

  • • Tinted low-e glass for fenestration

  • • Reduction of cooling loads by 30%

  • • Solar shading

  • • Low-emissivity glazing

3Hot-humid climate (Köppen Af)
  • • Natural ventilation

  • • Appropriate vapor control strategy within ventilation openings

  • • Semitransparent photovoltaic window configurations

  • • Reduction of envelope heat gain by 4%

  • • Tinted conventional glazed fenestrations

4Temperate climate (Köppen Cfb)
  • • Wall insulation

  • • Prioritization of external insulation with solar shading

  • • Balanced heat loss and heat gain from the building envelope

  • • Optimized window glazing

  • • Dynamic building envelope

Operational framework for NZEB container conversion.

Source: Authors 2026.

The following are criteria that shipping containers must satisfactorily attain prior to conversion into habitable units:

  • Shipping containers that undergo partial remediation, such as welding and removal of the interior lining, should only be adopted for non-structural use.

  • Freight containers previously adopted for chemical transportation with excessive corrosion should be avoided due to the potential presence of harmful residue within floor timbers and in the container’s interior wall coating.

  • Due to the prevalent use of lead-based paint primers in earlier manufactured shipping container models, X-ray fluorescence (XRF) should be adopted in detecting heavy metals within all container surfaces.

  • All shipping containers must perform optimally under racking, stacking, and all structural tests with all cross members firmly fixed in place.

5 Conclusion

This study was conducted to evaluate various strategies that can transform shipping container architecture into net-zero energy buildings with a view to determining the most effective and sustainable approach for improved environmental performance. Four main objectives were formulated to achieve this. Before qualification as net-zero energy buildings, four parameters must be present: exceptional energy performance, renewable energy generation on site, proven net-zero energy balance, and restricted purchase of grid energy. The findings show that the shipping containers’ thermal load can be lowered by the implementation of solar design strategies. In addition, the southern direction should be prioritized when integrating photovoltaics along the roof to attain a net-positive energy status. Although avoiding placing fenestrations along the east and west axes aids in controlling heat influx, hybrid shading systems can be used to protect the façade. Theoretically, net-zero energy buildings are a viable solution for lower energy consumption, but there is a discrepancy between simulated and actual energy usage.

The modular coordination of shipping containers has greatly simplified project development by creating innovative residential and public buildings, although the absence of standardized regulations has impeded widespread adoption. Based on the findings, the contribution to knowledge of this study is the redefinition of the general misconception regarding the extent of application of shipping containers as building solutions with optimal environmental performance through the integration of diverse insights by providing a guideline for future designs. Therefore, based on the findings of the study, it is recommended that supportive policies and professional collaboration should be created within the built industry to form the basis for exploring the full potential of net-zero shipping container architecture.

It is acknowledged that relying solely on existing literature obtained from database searches constitutes a limitation for the study. This is because the outcome of the study and judgment were strictly based on and influenced by the available secondary data reviewed. However, this does not diminish the contribution of this study, which provides insight into the direction and extent of the application of shipping containers as building solutions with the potential for optimal environmental performance. The benefits of shipping containers as a major walling material for various building types are unlimited, thereby redefining the prevailing misconception and providing a guideline for future designs. Suggestions for future research include user satisfaction with net-zero shipping container architecture, investigating the inclusion of low-carbon footprint and innovative retrofitting materials in shipping container architecture, and developing frameworks to increase global acceptance of net-zero shipping container architecture.

Statements

Author contributions

AS: Writing – review and editing, Funding acquisition, Methodology, Project administration, Conceptualization. OB: Supervision, Writing – review and editing, Formal Analysis, Validation. MN: Investigation, Writing – original draft, Data curation, Visualization.

Funding

The author(s) declared that financial support was not received for this work and/or its publication.

Acknowledgments

The immense gratitude of the authors goes to the Covenant University Centre for Research, Innovation, and Discovery (CUCRID) for the provision of a conducive academic research environment that facilitated the completion of this study. The authors also appreciate all cited authors for their invaluable contributions to knowledge.

Conflict of interest

The author(s) declared that this work was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Generative AI statement

The author(s) declared that generative AI was used in the creation of this manuscript. The authors declare that solely a generative grammar editing tool was used to fine-tune this manuscript, removing ambiguity and ensuring consistency. All authors remain responsible for all intellectual content, literature inferences, and conclusions.

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Summary

Keywords

adaptive reuse, architecture, energy, net-zero strategies, shipping container

Citation

Sholanke AB, Babalola OD and Nzeh ME (2026) Evaluation of net-zero strategies in shipping container architecture. Front. Built Environ. 12:1699277. doi: 10.3389/fbuil.2026.1699277

Received

04 September 2025

Revised

05 April 2026

Accepted

13 April 2026

Published

28 May 2026

Volume

12 - 2026

Edited by

Zheming Liu, Northeastern University, China

Reviewed by

Sofia Melero-Tur, CEU San Pablo University, Spain

Armand Omar Moeis, University of Indonesia, Indonesia

Updates

Copyright

*Correspondence: Millicent Eberechukwu Nzeh,

Disclaimer

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.

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