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name: "material-passports-circular" description: "Material passports and circular construction: generate per-element material inventories from BOQ/BIM, mark reuse potential and recycled content, and prepare deconstruction data. Use for circular-economy and EU Taxonomy-aligned projects."

Material Passports & Circular Construction (2026)

Why it matters

The EU Taxonomy and CSRD push construction toward circularity: buildings must be designed for disassembly, materials traceable for reuse. A material passport is a digital record of what is in a building, where, and how it can be reused at end of life.

What a passport contains

Per element (or per BOQ line):

Field	Source
material & volume/mass	BOQ components[] (resource_name, resource_quantity, resource_unit)
location in the building	BIM element link
manufacturer / EPD	procurement records
recycled content %	supplier declaration / EPD
reuse potential at EOL	disassembly class (reusable / recyclable / downcyclable / landfill)
embodied carbon (A1–A3)	embodied-carbon-esg skill

Building the passport from DDC data

# per BOQ line: material inventory from CWICR components
for line in boq:
    for comp in line["components"]:
        if comp["type"] == "material":
            passport.append({
                "element": line["description"],
                "material": comp["name"],
                "quantity": line_quantity * comp["quantity"],
                "unit": comp["unit"],
                "recycled_content": epd_lookup(comp["name"]),   # from EPD library
                "reuse_class": disassembly_class(comp["name"]),  # rule-based
            })

Design-for-disassembly rules to encode

1. Prefer mechanical fixings over wet trades (plaster/glue) at interfaces.
2. Mark structural vs non-structural layers — non-structural is the reuse pool.
3. One material per composite where possible (separate insulation from structure).
4. Record as-built changes — the passport must match the building, not the drawing.

Reporting

• Total mass per material family (concrete, steel, timber, glass, insulation…).
• % recyclable/reusable by mass (EU Taxonomy circularity KPI).
• Hazardous content register (asbestos-free declaration, formaldehyde, VOC).

Resources

• EU Level(s) framework: https://environment.ec.europa.eu/topics/circular-economy/levels_en
• Madaster (material passport platform): https://madaster.com
• EPD libraries: https://www.eco-platform.org