How-to: implement embodied carbon targets in design and procurement with a lean team

Why It Matters

Embodied carbon, the greenhouse gas emissions from extracting, manufacturing, transporting, and installing building materials, accounts for roughly 11 percent of global CO₂ emissions and nearly half of a new building's total lifecycle carbon footprint (Architecture 2030, 2024). As operational energy efficiency improves through electrification and renewables, the relative share of embodied carbon grows larger. The World Green Building Council estimates that embodied emissions must fall 40 percent by 2030 to keep the sector aligned with a 1.5 °C pathway (WorldGBC, 2024). Despite this urgency, fewer than 15 percent of architecture and engineering firms systematically measure embodied carbon on every project, and procurement teams rarely require Environmental Product Declarations (EPDs) from suppliers (CLF, 2025).

Regulation is accelerating the shift. California's Buy Clean Act now mandates Global Warming Potential (GWP) limits for structural steel, flat glass, and mineral wool insulation in state-funded projects. The EU's revised Construction Products Regulation, effective 2026, will require manufacturers to disclose lifecycle carbon data via standardized EPDs (European Commission, 2025). The City of Vancouver requires whole-building lifecycle assessment (LCA) for all rezoning applications, and London's Greater London Authority updated its planning guidance in 2025 to set embodied carbon benchmarks for major developments (GLA, 2025). For lean sustainability teams, the question is no longer whether to address embodied carbon but how to do so efficiently with constrained staff and budgets.

Key Concepts

Whole-building lifecycle assessment (WBLCA). A WBLCA quantifies greenhouse gas emissions across a building's lifecycle stages: product (A1 to A3), construction (A4 to A5), use (B1 to B7), and end-of-life (C1 to C4). The EN 15978 and ISO 21931 standards define the methodology. For target-setting purposes, stages A1 to A3 (raw material supply, transport, and manufacturing) typically represent 70 to 80 percent of upfront embodied carbon and are the most actionable during design and procurement.

Environmental Product Declarations (EPDs). EPDs are standardized, third-party-verified documents that report the environmental impacts of a specific product based on lifecycle assessment. They follow EN 15804 or ISO 14025 and enable apples-to-apples comparisons between competing materials. The number of construction EPDs available globally grew 28 percent between 2023 and 2025, reaching over 120,000 product-specific declarations (EC3, 2025).

Global Warming Potential (GWP). GWP expresses the climate impact of a material in kilograms of CO₂-equivalent per functional unit, such as per cubic meter of concrete or per tonne of structural steel. GWP is the primary metric used in embodied carbon targets and Buy Clean policies.

Carbon intensity benchmarks. Organizations like the Carbon Leadership Forum (CLF) and the Royal Institution of Chartered Surveyors (RICS) publish benchmark ranges for embodied carbon by building type, expressed in kgCO₂e/m². A typical office building in North America benchmarks at 300 to 500 kgCO₂e/m² for stages A1 to A5, with leading projects achieving below 250 kgCO₂e/m² (CLF, 2025).

Material carbon hotspots. Concrete, steel, aluminum, and insulation together account for roughly 80 percent of a typical building's embodied carbon. Targeting procurement specifications for these four material categories delivers the largest reductions with the least complexity for small teams.

What's Working

Early-stage LCA integration. Firms that run embodied carbon estimates at the concept design phase, rather than waiting until construction documentation, achieve 20 to 40 percent greater reductions because structural systems, floor-to-floor heights, and material palettes are still flexible. Tools like One Click LCA and Tally integrate with BIM platforms, enabling a single sustainability analyst to produce comparative estimates in hours rather than weeks (One Click LCA, 2025).

EC3 and open data platforms. The Embodied Carbon in Construction Calculator (EC3), developed by Building Transparency, provides free access to over 120,000 EPDs and allows teams to filter by product category, GWP range, geography, and plant. Lean teams use EC3 to write performance-based material specifications (e.g., "structural concrete with GWP below the 40th percentile of the EC3 database") without needing to identify specific suppliers in advance (Building Transparency, 2025).

Buy Clean procurement language. Standardized specification templates, such as those published by the CLF and the U.S. General Services Administration (GSA), let procurement staff insert embodied carbon requirements into bid documents with minimal customization. The GSA's Low Embodied Carbon Pilot requires product-specific EPDs and GWP limits for concrete and steel on all new federal projects, providing a tested model that lean teams can adapt (GSA, 2025).

Supplier engagement at scale. Major concrete and steel producers have invested in product-specific EPDs in response to Buy Clean mandates. Heidelberg Materials, Holcim, and CRH now publish EPDs for the majority of their ready-mix concrete plants in North America and Europe. This supply-side readiness means procurement teams can request EPDs as standard practice rather than as a special accommodation.

What's Not Working

Late-stage measurement. When LCA is performed only after design is substantially complete, opportunities to change structural systems or substitute materials are limited. Teams that treat embodied carbon assessment as a compliance check-box rather than a design input routinely miss the most impactful reduction levers.

Data gaps in specialty products. While EPD coverage for concrete and structural steel has improved dramatically, product categories such as curtain wall systems, waterproofing membranes, MEP equipment, and interior finishes still have limited EPD availability. Lean teams must often rely on industry-average data for these categories, reducing the precision of their assessments.

Inconsistent EPD quality. Not all EPDs are created equal. Differences in Product Category Rules (PCRs), system boundaries, and allocation methods can make direct comparisons misleading. The CLF found that 12 percent of construction EPDs reviewed in 2024 contained methodological inconsistencies that affected GWP figures by more than 10 percent (CLF, 2025).

Lack of contractual enforcement. Setting embodied carbon targets in design guidelines is necessary but insufficient. Without binding procurement language that requires EPD submission with bids, GWP verification at delivery, and consequences for non-compliance, targets are frequently treated as aspirational rather than mandatory.

Regional supply constraints. In markets where low-carbon concrete or recycled-content steel is not locally available, specifying aggressive GWP limits can narrow the bidder pool, increase costs, or add transportation emissions. Teams need to calibrate targets to regional supply realities using databases like EC3 to check product availability within practical transport distances.

Key Players

Established Leaders

• One Click LCA — Market-leading whole-building LCA software integrated with Revit, Rhino, and IFC; used on over 50,000 projects across 170 countries.
• Building Transparency (EC3) — Nonprofit maintaining the world's largest open-access EPD database and the EC3 calculator.
• Holcim — Global cement and concrete producer; committed to reducing cementitious GWP 20 percent by 2030 and publishing plant-level EPDs.
• Heidelberg Materials — Major producer offering ECOPact low-carbon concrete with 30 to 100 percent lower GWP than conventional mixes.

Emerging Startups

• Tangible Materials — AI-powered platform that automates EPD collection and GWP benchmarking during procurement.
• 2050 Materials — Data platform aggregating building material environmental data for early-stage design decisions.
• CarbonCure Technologies — CO₂ mineralization technology injected into fresh concrete, reducing GWP by 5 to 15 percent per mix.
• Brimstone — Developing carbon-negative Portland cement from calcium silicate rock, eliminating process emissions from limestone calcination.

Key Investors/Funders

• Breakthrough Energy Ventures — Backed Brimstone, CarbonCure, and other low-carbon materials startups with combined investments exceeding $200 million.
• U.S. General Services Administration (GSA) — Federal procurement policy driving Buy Clean requirements across $15+ billion in annual construction spending.
• LETI (London Energy Transformation Initiative) — Industry network publishing embodied carbon targets and design guidance adopted by the Greater London Authority.

Examples

Skanska USA (multiple projects). Skanska has integrated embodied carbon measurement into its standard project delivery workflow. On the Seattle Civic Tower project, the team used One Click LCA to benchmark structural systems at schematic design and substituted supplementary cementitious materials (SCMs) in concrete mixes, achieving a 32 percent reduction in structural embodied carbon relative to the baseline. Skanska's internal EC target requires all projects to measure and reduce embodied carbon, demonstrating that a corporate mandate combined with tool access enables lean project teams to deliver results without adding specialized headcount (Skanska, 2025).

Lendlease (Barangaroo South, Sydney). Lendlease required whole-building LCA and product-specific EPDs across the Barangaroo South precinct. The procurement team set GWP ceilings for concrete and structural steel, evaluated bids on both price and carbon performance, and verified EPD claims at delivery. The precinct achieved an embodied carbon intensity 22 percent below the Australian industry average. Lendlease has since rolled out its Embodied Carbon Reduction Framework across global operations, providing standardized specification language that small project sustainability teams can deploy without external consultants (Lendlease, 2024).

City of Vancouver (rezoning policy). Vancouver's rezoning policy, in effect since 2017 and updated in 2025, requires applicants to submit a WBLCA for all buildings above a size threshold. The policy includes a benchmark target of 350 kgCO₂e/m² for residential mid-rise and encourages design teams to pursue reductions through material substitution and structural optimization. By 2025, over 300 projects had been assessed, and the average submitted embodied carbon was 15 percent below the benchmark, indicating that measurement mandates drive voluntary improvement even without hard caps (City of Vancouver, 2025).

Microsoft (campus retrofits and new construction). Microsoft's 2024 Embodied Carbon Policy requires all new campus construction and major renovations to achieve embodied carbon levels at or below the 20th percentile of the CLF/EC3 database. The corporate real estate team of fewer than ten people manages implementation by embedding GWP requirements in master specifications and using EC3 for bid evaluation. Early results show average GWP reductions of 30 percent for concrete and 25 percent for structural steel relative to industry averages (Microsoft, 2025).

Action Checklist

• Establish a baseline. Run a WBLCA on a recent or representative project using One Click LCA, Tally, or equivalent tool. Record total embodied carbon (kgCO₂e/m²) for stages A1 to A5.
• Set a reduction target. Benchmark against CLF, RICS, or LETI published ranges for your building type. A 20 to 30 percent reduction from baseline is achievable for most project types using available materials.
• Integrate LCA at concept design. Require a preliminary embodied carbon estimate at the end of schematic design. Compare structural system options (steel frame vs. mass timber vs. concrete) and select based on both performance and GWP.
• Write performance-based specifications. Use EC3 percentile thresholds to set maximum GWP values for concrete, steel, aluminum, and insulation. Include language requiring product-specific EPDs with bids.
• Engage suppliers early. Hold a pre-bid meeting to communicate embodied carbon requirements. Ask suppliers to identify their lowest-GWP products and confirm EPD availability.
• Verify at delivery. Require batch-specific EPDs or mill certificates at material delivery. Compare actual GWP to specification limits and flag non-conformances.
• Track and report. Update the WBLCA at design development, construction documents, and as-built stages. Report final embodied carbon alongside operational carbon in sustainability disclosures.
• Build a material database. Maintain an internal log of EPDs, supplier GWP data, and pricing for materials specified on past projects. This institutional knowledge accelerates specification writing on future projects.
• Advocate for policy. Share project data with industry groups like CLF and Building Transparency. Lean teams multiply their impact when anonymized data contributes to public benchmarks.

FAQ

What is the minimum team size needed to implement embodied carbon targets? A single sustainability professional embedded in the design or procurement team can manage embodied carbon measurement and specification if they have access to an LCA tool and a structured workflow. Most successful lean implementations assign one person to own the WBLCA model and EPD review process, while design and procurement colleagues incorporate carbon performance into their existing scope evaluation and bid analysis responsibilities.

How do you set a target when benchmark data varies widely? Start with the CLF Benchmark Study or RICS Whole Life Carbon Assessment guidance for your building type and region. Use the median as a baseline and set the target at the 20th to 40th percentile. As your team gains experience and local supply chains mature, ratchet the target downward. Avoid setting targets so aggressive that they exclude all local suppliers, which can increase transport emissions and costs.

What do you do when a supplier cannot provide an EPD? If a supplier lacks a product-specific EPD, request an industry-average EPD from the relevant trade association or use a conservative estimate from the EC3 database. Include a contract clause requiring the supplier to obtain a product-specific EPD within 12 to 18 months. For high-volume materials like concrete and steel, inability to provide an EPD in 2026 is increasingly a signal of lagging sustainability maturity and may warrant selecting an alternative supplier.

Does reducing embodied carbon increase construction costs? Not necessarily. A 2025 analysis by the Carbon Leadership Forum found that projects achieving 10 to 20 percent embodied carbon reductions typically saw less than 1 percent cost impact, and some realized net savings through material efficiency and waste reduction (CLF, 2025). Cost premiums tend to appear only at the most aggressive reduction levels (above 40 percent) or in markets with limited low-carbon supply. Early integration at concept design, where structural optimization can reduce total material quantities, is the most cost-effective reduction pathway.

How do you handle embodied carbon in renovation versus new construction? Renovation inherently conserves much of the embodied carbon locked in the existing structure. Teams should account for this benefit using a "carbon payback" framework: compare the embodied carbon of new materials against the avoided emissions from retaining the existing building. The RICS methodology for refurbishment projects includes guidance on setting boundaries and benchmarks that reflect the carbon advantage of adaptive reuse over demolition and rebuild.

Sources

• Architecture 2030. (2024). New Buildings: Embodied Carbon. Architecture 2030.
• WorldGBC. (2024). Bringing Embodied Carbon Upfront: Coordinated Action for the Building and Construction Sector. World Green Building Council.
• CLF. (2025). Embodied Carbon Benchmark Study: North American Building Data and Specification Guidance. Carbon Leadership Forum.
• European Commission. (2025). Revised Construction Products Regulation: Lifecycle Environmental Declarations. European Commission.
• GLA. (2025). London Plan Guidance: Whole Life-Cycle Carbon Assessments for Major Developments. Greater London Authority.
• Building Transparency. (2025). EC3 Database Statistics and User Impact Report. Building Transparency.
• One Click LCA. (2025). Global LCA Platform Usage and Integration Report. One Click LCA.
• GSA. (2025). Low Embodied Carbon Pilot: Federal Buy Clean Procurement Requirements. U.S. General Services Administration.
• Skanska. (2025). Embodied Carbon Reduction in Practice: Seattle Civic Tower and Portfolio Results. Skanska USA.
• Lendlease. (2024). Embodied Carbon Reduction Framework: Barangaroo South and Global Rollout. Lendlease.
• City of Vancouver. (2025). Rezoning Policy: Whole-Building LCA Results and Benchmark Performance. City of Vancouver.
• Microsoft. (2025). Embodied Carbon Policy for Campus Construction: Implementation and Results. Microsoft Corporate Real Estate.