Embodied Carbon in Buildings: A Complete 2026 Guide
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Embodied carbon in buildings is responsible for approximately 2.9 gigatons of CO₂ per year, according to the UNEP Global Status Report for Buildings and Construction 2024/2025, making it one of the most consequential yet persistently under-measured sources of emissions in the global economy. While the industry has long focused on operational energy, the tide is turning: tightening regulations, new EPD mandates, and investor scrutiny are pushing sustainability teams, manufacturers, and consultants to quantify embodied carbon at the product and building level. This guide explains what embodied carbon in buildings actually means, where the impact lives across the lifecycle, how to calculate it credibly, and what the regulatory landscape now demands from those who supply or specify materials.
Key Takeaways
- Global buildings account for 39% of energy-related CO₂ emissions today, split roughly 28/11 between running them (operational) and building them (embodied carbon).
- By 2050, upfront carbon, the emissions locked in before a building is ever occupied, is projected to make up half of all new-construction emissions, eating directly into the world’s remaining carbon budget.
- Embodied carbon is baked in at the design and procurement stage. Once concrete is poured, the carbon is already emitted. This makes early-stage LCA the highest-leverage intervention available.
- EU member states must report global warming potential (GWP) for new buildings over 1,000 m² from 2028 and for all new buildings from 2030, with results shown on energy performance certificates.
- Applying low-cost and no-cost embodied carbon solutions can result in 19 to 46 percent emissions reductions at cost premiums of less than 1 percent, making the business case for action clear.
What Embodied Carbon in Buildings Actually Means
Most people in the built environment are familiar with operational carbon: the emissions from heating, cooling, and lighting a building over its working life. Embodied carbon is the other half of the equation, and for a long time it was the neglected half.
Embodied carbon refers to the carbon footprint associated with materials and construction processes used during the whole lifecycle of a building. It includes emissions created during the production of building materials (raw material extraction, transport to the manufacturer, manufacturing), the transport of the materials to a job site, and the construction process itself. It also encompasses emissions produced during the use phase of the lifecycle, in building maintenance, repair, replacement, refurbishment, deconstruction, waste transport, disposal, and material recycling.
The distinction matters because the two carbon types require fundamentally different interventions. Operational carbon can be cut over the building’s entire life by switching energy sources or improving insulation. Embodied carbon, by contrast, is largely determined before a shovel hits the ground. The best way to impact the embodied carbon of a building is early in the building’s design, when structural and material decisions are being made.
The Shift in Relative Importance
For decades, operational carbon dominated sustainability discussions in construction, and reasonably so: energy use in buildings has historically dwarfed materials-related emissions. That picture is changing fast. Historically, much of the sector’s progress has centered around reducing the operational carbon emissions of buildings, those stemming from heating, cooling, and lighting. Projections suggest that these operational emissions will decrease from 75% to 50% of the sector’s total emissions in the coming decades. As grids decarbonize and net-zero energy buildings become more attainable, embodied carbon will take an ever-larger share of total lifecycle impact. As net-zero energy buildings become increasingly achievable, decarbonization efforts have shifted toward reducing embodied carbon across the full building lifecycle to meet net-zero carbon targets.
Where Embodied Carbon Hides: The Phase Breakdown
Understanding where embodied carbon originates is the first step in reducing it. The lifecycle of a building material is typically divided into modules following standards like EN 15978 and ISO 14040/44: from raw material extraction (A1) through manufacturing (A3), transport to site (A4), construction (A5), use-phase maintenance (B), all the way to end-of-life demolition and disposal (C).
The relative weight of each phase varies enormously by material. Consider brick, one of the most ubiquitous building materials on the planet. Devera’s ISO 14040/44-compliant LCA benchmark for brick puts its median carbon footprint at 0.98 kg CO₂e per kilogram, with a range of 0.70 to 1.21 kg CO₂e. The phase breakdown tells an instructive story: manufacturing accounts for 47.8% of that total, transport for 26.2%, and raw materials extraction for 21.7%. What this means in practice is that for a material as simple as a fired clay brick, nearly half the carbon impact is determined by the kiln’s energy source, not by the clay quarry or the delivery truck. It is a direct argument for specifying bricks manufactured using lower-carbon energy, and for engaging suppliers on their manufacturing emissions rather than focusing only on logistics.
Now compare that to structural timber furniture. Devera’s benchmark for a single stool, with a median of 21.57 kg CO₂e and a range of 8.34 to 44.83 kg CO₂e, shows that raw materials dominate at 52.7% of the total impact, with manufacturing at 24.6% and end-of-life at 13.6%. The enormous range (more than a fivefold spread between the low and high estimates) reflects how sensitive wood-based products are to sourcing decisions, including forest management practices and the origin of the timber. For design and procurement teams specifying wood-based structural or interior elements, this variability is not academic. It is the kind of insight that makes verified, product-specific EPD data so much more useful than generic average emission factors.
The contrast between these two products captures a core truth about embodied carbon in buildings: the leading impact phase differs by material category. There is no universal answer to “where does the carbon come from?” The only rigorous response is to measure it.
Upfront Carbon: The Most Urgent Slice
Within the embodied carbon envelope, the construction industry increasingly focuses on “upfront carbon,” covering modules A1 through A5. This is the carbon emitted before a building is first occupied. It cannot be offset through future efficiency improvements. Carbon emissions released before the built asset is used will be responsible for half of the entire carbon footprint of new construction between now and 2050, threatening to consume a large part of the remaining carbon budget. Therefore the built environment sector has a vital role to play in responding to the climate emergency, and addressing upfront carbon is a critical and urgent focus.
Current technology-enabled building practices (TECH-Build) achieve an average 45.7% reduction in upfront carbon compared to business-as-usual practices, equivalent to 236.29 kg CO₂e/m² in savings. The gap between business-as-usual and best practice is wide enough to matter at a policy level, but closing it at scale requires systematic measurement across the supply chain.
Largest Sources of Embodied Carbon in Buildings
Not all materials contribute equally. Building materials like iron and steel, cement and concrete, and aluminum alone contribute a significant share of total building-related emissions. Concrete is the single biggest driver in most building types. Concrete alone is responsible for about 8% of global CO₂ emissions, and within a typical reinforced concrete structure, its dominance is even more pronounced.
Typical embodied carbon for general concrete falls between 0.1 and 0.2 kg CO₂ per kilogram. Exact values depend on mix, cement content, and manufacturing methods. But those seemingly small per-kilogram numbers multiply fast. A single mid-rise residential building can contain thousands of tonnes of concrete. This is where aggregate exposure matters: a procurement team switching from a high-Portland cement mix to one that incorporates supplementary cementitious materials can deliver meaningful whole-building reductions. Substituting cement with slag, fly ash, or other pozzolanic or lime-based materials can reduce embodied carbon by 14 to 33 percent at no cost or even a cost reduction.
Steel, aluminum, and insulation materials round out the main contributors. Steel’s impact depends heavily on whether it is produced via a basic oxygen furnace (using primary ore) or an electric arc furnace (using recycled scrap). The A1 to A3 embodied carbon factor for rebar produced in the UK can be 0.684 kg CO₂e/kg, whereas a bar produced in the UAE with no recycled content could be closer to 2.1 kg CO₂e/kg. A threefold difference for the same product, from the same product category, purely a function of geography and production method. For sustainability and procurement teams, this is exactly why origin-specific EPD data outperforms industry averages.
For a deeper look at how to approach the full lifecycle of construction materials, see Devera’s companion piece on Construction Materials Sustainability: LCA, Data & 2026 Guide.
How to Calculate Embodied Carbon in a Building
There is no single calculation method, but there is a clear methodological hierarchy. The most defensible approaches are grounded in ISO 14040 and ISO 14044, the international standards for life cycle assessment that define the principles, framework, requirements, and procedures for conducting a credible LCA. The International Organization for Standardization has established standards including methods for conducting LCAs, developing and using EPDs, and sustainability performance indicators. ISO 14040 and 14044 are key in developing LCA principles, frameworks, requirements, and procedures.
In practice, embodied carbon calculations for buildings rely on three types of input data, in increasing order of quality.
Generic emission factors come from databases like the Inventory of Carbon and Energy (ICE) or Ecoinvent. They are faster to apply but average over a wide range of production practices. Useful for early-stage screening; insufficient for EPD-level reporting.
Industry-average EPDs are third-party verified declarations covering a category of products (for example, all ready-mix concrete from a given country). Better than generic factors, but they obscure the variance between specific suppliers.
Product-specific EPDs represent primary data from an individual manufacturer’s production. EPDs are essentially material “nutrition labels” that report a variety of lifecycle impacts, including global warming potential, acidification, eutrophication, ozone depletion, and smog formation. They are the gold standard for whole-building LCA and the data type that regulators are increasingly mandating.
LCA methodology for embodied carbon calculation can divide buildings into four sections: structure, envelope, interior, and exterior, enabling precise identification of carbon-intensive products. Data collection is enhanced by promoting the use of EPDs for accurate material-specific carbon calculations.
Tools like the Embodied Carbon in Construction Calculator (EC3) can aggregate EPD data at a project level. EC3 is a free, cloud-based tool that allows benchmarking, assessment, and reductions in embodied carbon, focused on upfront supply chain emissions of construction materials. It utilizes building material quantities from construction estimates and BIM models and a robust database of digital, third-party verified EPDs.
For sustainability professionals who need to produce EPDs at product level and feed that data into building-level compliance assessments, the methodology underpinning every calculation matters. You can explore the full scope of what an LCA entails in Life Cycle Assessment: The Complete Guide (2026).
The Regulatory Landscape in 2026
Embodied carbon in buildings has moved decisively from a voluntary reporting topic to a mandatory compliance obligation across the EU. Three regulations are now shaping how material manufacturers, construction companies, and their sustainability teams need to operate.
Construction Products Regulation (CPR, EU 2024/3110): Regulation (EU) 2024/3110 entered into force on January 7, 2025, and becomes applicable from January 8, 2026 for most construction products. The revised CPR adds mandatory climate indicators, introduces Digital Product Passports, and expands CE marking. By 2032, manufacturers must provide full lifecycle environmental data for all construction products.
Energy Performance of Buildings Directive (EPBD, recast 2024): The EPBD aligns building-level performance with a harmonized lifecycle methodology: whole life carbon calculation and disclosure for new buildings using EN 15978 methods and the Level(s) framework. From January 2028, lifecycle GWP calculations become mandatory for new buildings above 1,000 m², with GWP disclosed on energy performance certificates.
Corporate Sustainability Reporting Directive (CSRD): The CSRD requires large firms to disclose embodied carbon, biodiversity impacts, and other ESG metrics. For companies subject to CSRD, the whole-life carbon data the EPBD requires feeds directly into sustainability disclosures. The building LCA data produced for EPBD compliance and the Scope 3 emissions data required for CSRD draw on much of the same underlying information: energy consumption, material quantities, and supplier-level carbon data in the form of EPDs.
| Regulation | Scope | Key embodied carbon obligation | Timeline |
|---|---|---|---|
| CPR (EU 2024/3110) | Construction product manufacturers | Declare GWP in Declaration of Performance and Conformity | Jan 2026 (Group 1) |
| EPBD (recast) | New buildings | Whole-life carbon (WLC) disclosure using EN 15978 | Jan 2028 (>1,000 m²); Jan 2030 (all new buildings) |
| CSRD | Large companies (incl. those owning/developing buildings) | Embodied carbon as part of ESRS E1 climate disclosures | In force for largest companies from 2024 |
The practical implication: companies that integrate building performance into their carbon strategy rather than treating EPBD compliance as a separate exercise will find the same data serves both EPBD and CSRD requirements.
How to Reduce Embodied Carbon in Buildings
Reducing embodied carbon in buildings is a design-time problem more than a procurement-time problem. Once the structural system is locked in and the bill of materials is set, the margin for improvement narrows fast. The most effective interventions follow a rough order of priority.
Material selection and specification. One of the most effective strategies for minimizing embodied carbon is to make informed choices during the initial stages of structural design. Opting for materials with a lower carbon footprint, such as mass timber, recycled steel, or alternative concrete additives like fly ash, limestone, or slag, can substantially reduce the environmental impact of new constructions.
Material efficiency and lean structural design. Reducing the total volume of high-carbon materials used is often more impactful than substituting one product for another. Key mitigation strategies, including low-carbon materials, circular economy practices, digital optimization, and construction management, contribute reductions of up to 59%, 40%, 35%, and 2% respectively. Low-carbon materials and circular practices together represent roughly 99% of the available reduction potential, which should inform where design teams direct their attention.
Adaptive reuse and renovation over demolition. In an adaptive reuse project, the interior or exterior of a building is remodeled or altered so that the building can be used for a different purpose, such as adapting a former bank building to office space or a former warehouse to apartments. Every kilogram of existing structure retained is a kilogram of new material that never needs to be manufactured.
EPD-informed procurement. Specifying that suppliers provide verified, product-specific EPDs at the tender stage creates direct supply-chain pressure for lower-carbon products. EPD provision is becoming a procurement expectation for construction products. Suppliers without EPDs will increasingly find themselves locked out of publicly funded projects and green building certification schemes.
Whole-building LCA as a design tool. A whole building LCA looks at the quantities of materials and products used and their associated climate impact, from sourcing, through construction, use phase, and end of life disposal, to estimate the total embodied carbon of a building design. This helps create a baseline estimate that can then be used to identify and inform reduction measures.
For sustainability and procurement teams wanting to build the measurement infrastructure before the design is locked in, the principles in Design for Environment Principles: A Practical Guide offer a useful framework.
From Benchmarks to Product-Level Action
One of the persistent frustrations in embodied carbon work is the gap between building-level ambitions and product-level data. Targets set in kilogram CO₂e per square meter of floor area mean little unless they translate into specifications that suppliers and manufacturers can actually respond to.
This is where product-level carbon benchmarks become genuinely useful. Return to the brick data: at 0.98 kg CO₂e per kilogram (median), with manufacturing at 47.8% of total impact, a manufacturer who shifts their kiln to renewable electricity or integrates industrial waste heat could plausibly move from a C-grade product (below 1.03 kg CO₂e) to a B-grade or even A-grade product (below 0.80 kg CO₂e). That is not a marginal improvement. Scaled across millions of bricks in a single medium-sized commercial development, it represents a measurable contribution to the project’s whole-building GWP target.
The stool example reinforces a different point, aimed at interior fit-out teams. The 5.4x spread between the best and worst stool (8.34 to 44.83 kg CO₂e) is not explained by the product’s function. It is explained by sourcing choices, manufacturing energy, and end-of-life design. At the scale of a commercial office or hospitality fit-out, where hundreds or thousands of individual furniture pieces are specified, material procurement choices accumulate into a significant portion of total embodied carbon. Teams who treat interior finishes as outside the scope of their embodied carbon assessment are leaving a real hotspot unmanaged.
The point is not that bricks or furniture dominate building-level carbon. Concrete and steel still do. The point is that systematic, product-level measurement reveals where the leverage is, and that leverage often sits in phases that assumptions would not predict.
Frequently Asked Questions
What is embodied carbon in buildings, and how does it differ from operational carbon? Embodied carbon in buildings covers the greenhouse gas emissions associated with producing, transporting, and installing building materials, plus maintenance, refurbishment, and end-of-life phases. Operational carbon, by contrast, comes from the energy used to heat, cool, and power a building during its occupied life. The key distinction is timing: embodied carbon is largely fixed before a building is occupied, while operational carbon accumulates over decades.
How is embodied carbon calculated for a building or construction product? The standard approach follows ISO 14040 and ISO 14044 Life Cycle Assessment methodology, dividing the building into structural, envelope, interior, and exterior sections and assigning an emission factor to each material quantity. The most rigorous data source is a verified Environmental Product Declaration (EPD) from the specific manufacturer. Generic database emission factors can be used for early-stage estimates, but product-specific EPDs are required for regulatory compliance under frameworks like the EU Construction Products Regulation.
Which building materials have the highest embodied carbon? Concrete, steel, and aluminum carry the greatest total embodied carbon burden in most buildings, both because of their high emission factors and their sheer volume of use. Concrete’s embodied carbon ranges from roughly 0.1 to 0.2 kg CO₂e per kilogram depending on mix design, but it is used in such quantities that it typically dominates a whole-building LCA. Steel production method and recycled content drive very wide variance: rebar can range from below 0.7 kg CO₂e/kg using recycled electric arc furnace production to over 2 kg CO₂e/kg for virgin-ore processes.
What EU regulations now require embodied carbon reporting for buildings? Three regulations converge on this obligation. The revised Construction Products Regulation (CPR 2024/3110) requires construction product manufacturers to declare global warming potential from January 2026. The recast Energy Performance of Buildings Directive (EPBD) mandates whole-life carbon calculations for new buildings over 1,000 m² from January 2028, extending to all new buildings by 2030. The Corporate Sustainability Reporting Directive (CSRD) requires large companies to include embodied carbon in their climate disclosures under ESRS E1. These three frameworks largely draw on the same underlying EPD and LCA data, meaning a single data infrastructure can serve all three obligations simultaneously.
For material manufacturers and construction teams who need product-level embodied carbon data rather than generic industry averages, calculate your product carbon footprint using ISO 14040/44 methodology mapped directly to your bill of materials. Devera turns supply chain data into EPD-ready, audit-ready numbers across a full material portfolio. If you’re evaluating whether the platform fits your reporting needs, see pricing for your portfolio size.