---

name: "embodied-carbon-esg" description: "Estimate embodied carbon and produce ESG/climate reporting for construction: LCA per work item, material-based carbon factors, EU taxonomy and CSRD alignment. Use when a project needs carbon estimates or sustainability reporting."

Embodied Carbon & ESG for Construction (2026)

Why it matters now

From 2026 the EU CSRD (Corporate Sustainability Reporting Directive) and EU Taxonomy force contractors and developers to report embodied carbon (A1–A5 life-cycle modules), not just operational energy. Estimators need carbon numbers next to price numbers at the BOQ line level.

Method

Carbon = quantity × carbon factor, applied per material resource line — exactly parallel to quantity × unit price = cost.

work item → components[] → material lines → quantity × EF (kg CO₂e / unit) → line carbon
BOQ roll-up: Σ line carbon = project embodied carbon (A1–A3) + transport/waste (A4–A5)

Data sources for factors

Source	Coverage	License
ÖKOBAUDAT (DE)	building materials	open
INIES (FR) FDES	products	open
ICE Database (UK)	embodied carbon	free registration
EPD libraries (ECO Platform)	manufacturer EPDs	varies

The CWICR bases already carry per-resource quantity and unit — attach an EF (kg CO₂e/unit) column for the materials and the roll-up is automatic.

What to compute per project

• A1–A3 embodied carbon per BOQ section and per trade (from material lines).
• A4–A5 transport + site waste assumptions (distance bands, waste rates per material).
• kg CO₂e / m² and / m³ intensity benchmarks for early design.
• Hotspot report: top 10 carbon lines (usually concrete, steel, aluminium, insulation).

EU Taxonomy / CSRD alignment

• Map each work item to the taxonomy activity (construction of new buildings 7.1, renovation 7.2, …).
• Report DNSH (Do No Significant Harm) screening: circularity, waste, water for the top materials.
• Keep the evidence trail: factor source + version per line (auditors ask).

Honest limits

• Carbon factors are regional and versioned — never mix databases without noting it.
• BIM takeoff gives geometry; carbon needs material takeoff (from CWICR resource_name + resource_quantity).
• Early-phase estimates are ±30–50%; label them as such.

Resources

• ÖKOBAUDAT: https://oekobaudat.de
• ICE Database: https://circularecology.com/embodied-carbon-footprint-database.html
• EU CSRD: https://finance.ec.europa.eu/capital-markets-union-and-financial-markets/company-reporting-and-auditing/company-reporting/corporate-sustainability-reporting_en