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embodied-carbon-esg

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.

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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

SourceCoverageLicense
ÖKOBAUDAT (DE)building materialsopen
INIES (FR) FDESproductsopen
ICE Database (UK)embodied carbonfree registration
EPD libraries (ECO Platform)manufacturer EPDsvaries

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

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