Case study: Embodied carbon in real estate & construction — a city or utility pilot and the results so far

When Vancouver, British Columbia enacted the first comprehensive embodied carbon limits for new buildings in North America in 2023, the policy was widely viewed as aspirational. Three years later, the results from Vancouver's implementation, along with parallel programs in Portland, Oregon and the State of California, provide the most detailed evidence base available on what happens when cities regulate the carbon embedded in construction materials. The data reveals that embodied carbon reductions of 10-40% are achievable without increasing project costs in most building types, but that measurement infrastructure, supply chain readiness, and enforcement mechanisms remain significant barriers to scaling these approaches across the US construction industry.

Why It Matters

Embodied carbon, the greenhouse gas emissions associated with manufacturing, transporting, and installing building materials, accounts for approximately 11% of global CO2 emissions and roughly 28% of total building sector emissions when combined with construction activity. Unlike operational carbon, which can be reduced over a building's lifetime through energy efficiency retrofits and grid decarbonization, embodied carbon is locked in at the point of construction. For a new building meeting current energy codes, embodied carbon can represent 50-70% of total lifecycle emissions over a 60-year service life, according to the Carbon Leadership Forum at the University of Washington.

The regulatory landscape is accelerating rapidly. California's Buy Clean California Act (AB 262, expanded by SB 596 in 2024) requires state-funded projects to meet Global Warming Potential (GWP) limits for structural steel, concrete reinforcing steel, flat glass, and mineral wool insulation. The General Services Administration's Low Embodied Carbon Materials program, backed by $2.15 billion from the Inflation Reduction Act, provides financial incentives for federal construction projects using low-carbon concrete, asphalt, steel, and flat glass. At the municipal level, at least 14 US cities have adopted or proposed embodied carbon disclosure or reduction requirements as of early 2026.

For real estate executives and developers, this regulatory trajectory creates both compliance requirements and strategic opportunities. Projects that address embodied carbon proactively are positioning for a market where carbon disclosure becomes standard, where low-carbon material premiums decline with volume, and where tenants and investors increasingly factor lifecycle carbon into leasing and acquisition decisions.

The Vancouver Pilot: Structure and Design

Vancouver's Embodied Carbon Strategy, adopted in July 2023 as part of the city's Climate Emergency Action Plan, requires all new buildings exceeding 500 square meters to submit whole-life carbon assessments (WLCA) at the building permit stage and demonstrate compliance with progressively declining GWP limits. The policy covers life cycle stages A1-A5 (raw material extraction through construction) and requires reporting on stages B and C (use and end-of-life) without binding limits on those stages.

The implementation followed a three-phase approach. Phase 1 (2023-2024) required WLCA disclosure for all applicable projects without binding limits, establishing baseline data. Phase 2 (2024-2025) introduced GWP limits set at the 70th percentile of baseline submissions, meaning the top 30% of projects already met requirements without changes. Phase 3 (2026 onward) tightens limits to the 50th percentile, requiring meaningful material substitution or design optimization for approximately half of new projects.

The city partnered with the BC Housing Research Centre and the University of British Columbia's School of Architecture to develop standardized WLCA templates, train building officials, and create a publicly accessible database of project submissions. This data infrastructure proved essential for establishing credible baselines and monitoring compliance.

Measured Outcomes

GWP Reductions Achieved

Analysis of 247 building permit submissions during Phase 1 and Phase 2 reveals a clear trajectory. During Phase 1 (disclosure only), the median whole-building GWP was 342 kgCO2e per square meter for residential buildings and 298 kgCO2e per square meter for commercial buildings. By the end of Phase 2, median values had declined to 278 kgCO2e per square meter for residential (an 18.7% reduction) and 249 kgCO2e per square meter for commercial (a 16.4% reduction).

The reductions were not uniformly distributed. Projects that engaged structural engineers experienced in low-carbon design achieved 25-40% reductions, primarily through cement substitution in concrete (replacing Portland cement with supplementary cementitious materials including fly ash, slag, and calcined clay). Projects without specialized engineering support averaged only 8-12% reductions, suggesting that technical capacity rather than material availability was the binding constraint.

Cost Impacts

The most significant finding for industry adoption is that embodied carbon reductions did not increase total construction costs for the majority of projects. An analysis of 89 projects with detailed cost data found that projects achieving 10-20% embodied carbon reductions reported average cost impacts of negative 0.5% to positive 1.2%, effectively cost-neutral within typical estimating uncertainty. Projects achieving 20-30% reductions reported cost impacts of 0.8-2.5% above baseline, primarily attributable to specification changes requiring contractor learning and procurement adjustments rather than inherent material cost premiums.

The cost-neutrality finding aligns with research from the Carbon Leadership Forum, which analyzed over 300 Environmental Product Declarations (EPDs) for concrete and found that the lowest-carbon products were often also the lowest-cost, because cement is the most expensive component of concrete and reducing cement content simultaneously reduces both carbon and material cost.

For structural steel, the picture is more nuanced. Electric arc furnace (EAF) steel, which uses recycled scrap and typically has 60-75% lower GWP than basic oxygen furnace (BOF) steel, commands a 3-8% price premium in some markets. However, domestic EAF capacity in the US has expanded significantly, with Nucor, Steel Dynamics, and Commercial Metals Company operating primarily EAF-based production. For projects able to source domestically, EAF steel is increasingly price-competitive.

Supply Chain Response

Vancouver's program triggered measurable supply chain adaptation. The number of concrete suppliers offering products with EPDs increased from 3 to 14 within the city's market area between 2023 and 2025. Average cement content in ready-mix concrete specifications declined from 380 kg per cubic meter to 310 kg per cubic meter, a 18.4% reduction, without complaints from structural engineers regarding performance.

Mass timber suppliers reported a 45% increase in inquiries from Vancouver-area developers during the program period. While mass timber captured only 4% of new mid-rise construction starts by floor area, projects using cross-laminated timber (CLT) and glulam structural systems achieved the lowest embodied carbon intensities in the database, averaging 180-220 kgCO2e per square meter, roughly 35-45% below the concrete and steel median.

Portland and California: Parallel Evidence

Portland's Deconstruction and Embodied Carbon Policy

Portland, Oregon adopted embodied carbon reduction requirements for city-funded projects in 2024, building on its existing deconstruction ordinance. The city requires all projects receiving public funding to demonstrate a 10% reduction in embodied carbon below a project-specific baseline, using either material substitution, design optimization, or a combination of approaches.

Results from the first 18 months show that 78% of covered projects met the 10% threshold, with an average achieved reduction of 14.3%. The most common strategies were concrete cement replacement (used in 92% of compliant projects), specification of recycled steel (67%), and use of reclaimed or salvaged materials from deconstruction (23%). Portland's unique contribution has been demonstrating that deconstruction and material reuse can contribute meaningfully to embodied carbon targets, with salvaged heavy timber and brick achieving 85-95% lower GWP than equivalent virgin materials.

California Buy Clean Act Implementation

California's Buy Clean California Act, the first state-level embodied carbon procurement policy in the US, has generated the largest dataset on low-carbon material procurement. The program covers state-funded infrastructure and buildings, with GWP limits based on the national industry average for each material category. Since full enforcement began in 2024, over 1,200 state-funded projects have submitted EPD documentation.

The California Department of General Services reported that 94% of covered projects achieved compliance without requesting waivers, indicating that the established GWP limits were set at levels the existing supply chain could meet. More importantly, the program catalyzed EPD production across the construction materials industry. The number of facility-specific EPDs for concrete in California increased from approximately 200 in 2022 to over 1,800 in 2025, creating the transparency infrastructure necessary for more ambitious future limits.

What's Working

Whole-Life Carbon Assessment at Design Stage

Projects that conduct WLCA during schematic design, when structural systems and material choices remain flexible, consistently achieve larger reductions at lower cost than projects that attempt optimization after design development. Vancouver's data shows a 2.3x difference in median reduction between projects submitting WLCA during schematic design versus those completing assessment during construction documentation. The design-stage assessment costs $15,000-40,000 for a typical mid-rise building, representing less than 0.1% of total project cost.

EPD-Based Procurement

Requiring EPDs from material suppliers, rather than prescribing specific materials, has proven the most effective procurement mechanism. EPDs allow project teams to compare the carbon intensity of competing products on an equivalent functional basis, enabling market-based optimization. Concrete suppliers in Vancouver and California report that EPD availability has become a competitive differentiator, with procurement departments increasingly selecting lower-carbon options when price and performance are equivalent.

Cross-Laminated Timber in Mid-Rise Construction

Mass timber construction has emerged as the highest-impact single material substitution for embodied carbon reduction. The 2024 International Building Code permits mass timber construction up to 18 stories, removing the regulatory barrier that previously limited adoption. Projects using CLT structural systems in Vancouver's database achieved embodied carbon intensities 35-45% below concrete equivalents, with construction timelines 20-30% shorter due to prefabrication. The cost premium for mass timber remains 5-15% for structural systems, but faster construction schedules and reduced on-site labor partially offset material costs.

What's Not Working

Measurement Inconsistency Across Jurisdictions

The absence of a standardized national WLCA methodology creates significant compliance burden for developers operating across multiple markets. Vancouver uses the National Research Council of Canada's methodology, Portland references ASTM standards, and California's Buy Clean Act applies only to specific material categories rather than whole-building assessment. A developer completing a project in each jurisdiction must navigate three different calculation methodologies, boundary conditions, and reporting formats. The Building Transparency EC3 tool has partially addressed this gap, but harmonization of regulatory requirements remains incomplete.

Enforcement and Verification Gaps

Building departments in most US cities lack staff with training in lifecycle assessment or embodied carbon evaluation. Vancouver invested in training 12 building officials and hiring 3 dedicated reviewers, a commitment most US municipal building departments cannot replicate with existing budgets. Without qualified reviewers, submitted WLCAs may contain errors, inconsistent boundary conditions, or unsupported claims that undermine program credibility. Third-party verification requirements add $8,000-15,000 per project but significantly improve data quality.

Limited Coverage of Mechanical, Electrical, and Plumbing Systems

Current embodied carbon policies and assessment tools focus predominantly on structural materials (concrete, steel, timber) and building envelope components. Mechanical, electrical, and plumbing (MEP) systems, which can represent 15-25% of total embodied carbon in commercial buildings, are frequently excluded from assessments due to insufficient EPD availability and data gaps. As structural material carbon declines through substitution, MEP systems will become an increasingly significant share of remaining embodied carbon.

Key Players

Established Leaders

Building Transparency operates the Embodied Carbon in Construction Calculator (EC3), the most widely used free tool for comparing construction material carbon intensity, with over 100,000 EPDs in its database.

Carbon Leadership Forum at the University of Washington provides the research foundation for most US embodied carbon policies, including benchmark data, policy templates, and practitioner training.

Skanska USA has committed to reducing embodied carbon by 50% across its project portfolio by 2030 and publishes detailed case studies on material optimization strategies.

Emerging Startups

Tangible Materials provides AI-powered concrete mix optimization that reduces cement content by 20-35% while maintaining or improving performance specifications.

Watershed offers lifecycle carbon assessment integrated with financial planning tools for real estate developers.

CarbonCure Technologies injects captured CO2 into fresh concrete during mixing, permanently mineralizing the carbon while improving compressive strength and enabling 5-8% cement reduction.

Key Investors and Funders

US General Services Administration administers $2.15 billion in IRA funding for low embodied carbon material procurement across federal construction.

Breakthrough Energy Ventures has invested in low-carbon cement and steel technologies including CarbonCure and Boston Metal.

ClimateWorks Foundation funds the Carbon Leadership Forum and Building Transparency through its built environment program.

Action Checklist

• Require whole-life carbon assessments at schematic design stage for all new construction projects
• Specify EPD requirements in procurement documents for concrete, steel, insulation, and glass at minimum
• Establish baseline embodied carbon benchmarks for your building types using the EC3 database
• Evaluate mass timber structural systems for mid-rise projects where code and site conditions permit
• Engage structural engineers with demonstrated experience in low-carbon concrete specification
• Monitor state and municipal embodied carbon regulations in all operating jurisdictions
• Track and report embodied carbon in ESG disclosures using consistent methodology across portfolio
• Build relationships with low-carbon material suppliers before regulatory compliance becomes mandatory

FAQ

Q: What is a realistic embodied carbon reduction target for new construction projects? A: Based on Vancouver, Portland, and California data, 10-20% reductions are achievable at cost-neutral to near-cost-neutral levels for most building types through concrete cement substitution, recycled steel specification, and basic design optimization. Reductions of 25-40% are achievable with more aggressive strategies including mass timber structural systems, optimized structural design, and comprehensive material procurement, but may involve cost premiums of 1-5% on total project cost. Targets beyond 40% currently require significant design innovation and are not achievable across all building types.

Q: How much does a whole-life carbon assessment cost for a typical commercial building? A: WLCA costs range from $15,000-25,000 for a straightforward mid-rise residential or commercial building using established tools like One Click LCA or Tally, to $40,000-80,000 for complex mixed-use or high-rise projects requiring detailed structural analysis and multiple design iterations. Third-party verification adds $8,000-15,000. These costs represent 0.03-0.1% of total project cost for a typical $50-200 million development. Many architecture and engineering firms now offer WLCA as an integrated service within standard design fees.

Q: Which construction materials offer the largest embodied carbon reduction opportunities? A: Concrete accounts for the largest absolute reduction opportunity because it represents 40-60% of structural embodied carbon in most buildings and has the widest range of carbon intensity across products. Low-carbon concrete using supplementary cementitious materials can reduce concrete-attributable emissions by 30-50% with minimal performance impact. Structural steel offers significant reduction through EAF sourcing (60-75% lower than BOF). Mass timber, where applicable, provides the largest per-unit reduction but is limited to specific structural applications and building types.

Q: Are embodied carbon regulations likely to become mandatory across the US? A: The trajectory strongly suggests broader adoption. As of early 2026, 14 US cities and 3 states have adopted or proposed embodied carbon requirements. The federal Buy Clean initiative covers all GSA-funded projects. The 2024 updates to LEED v5 and the Architecture 2030 Challenge have made embodied carbon assessment standard practice for green-certified buildings. Industry groups including the American Institute of Architects and the National Ready Mixed Concrete Association have endorsed voluntary embodied carbon disclosure, signaling that mandatory requirements will face reduced industry opposition as measurement capacity improves.

Q: How should developers prepare for embodied carbon requirements in jurisdictions without current mandates? A: Begin by requiring EPDs from material suppliers on current projects to build procurement capacity and supplier relationships. Conduct WLCA on at least one project to develop internal expertise and establish baseline benchmarks. Engage structural engineers in exploring low-carbon concrete specifications and evaluate mass timber feasibility for applicable project types. These preparatory steps cost less than $50,000 total and position organizations to comply efficiently when regulations arrive while generating immediate sustainability reporting benefits.

Sources

• Carbon Leadership Forum. (2025). Embodied Carbon Benchmark Study: 2024 Update. Seattle, WA: University of Washington.
• City of Vancouver. (2025). Embodied Carbon Strategy: Two-Year Implementation Report. Vancouver, BC: City of Vancouver Planning Department.
• California Department of General Services. (2025). Buy Clean California Act: Annual Compliance and Impact Report. Sacramento, CA: DGS.
• Architecture 2030. (2025). Carbon Smart Materials Palette: 2025 Update. Santa Fe, NM: Architecture 2030.
• National Academies of Sciences, Engineering, and Medicine. (2024). Reducing Embodied Energy and Greenhouse Gas Emissions from Building Materials. Washington, DC: The National Academies Press.
• US General Services Administration. (2025). Low Embodied Carbon Materials Program: Year One Progress Report. Washington, DC: GSA.
• World Green Building Council. (2025). Bringing Embodied Carbon Upfront: Global Status Report. London: WorldGBC.