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Carbon calibration you can feel: stack a wall, floor or roof from real cited materials (the same ICE factors Assayer charges whole buildings with) and the needle answers immediately in kgCO2e/m² — then swap materials and watch the meter move. Honest by design — product stage A1–A3 only, every value carries an uncertainty band, and biogenic carbon stored in timber is a separate line, never silently netted. The builder runs in your browser; sign in to ask the AI coach about your own swap idea (it never moves first).

Try the predict-first version ↗
Round

Build (or pick) an assembly and the needle answers straight away. Swap materials and watch the meter move — the ladder below is the calibration to carry away.

The ladder to hold onto: ~10 · ~50 · ~100 · ~500 kgCO2e/m².

Presets
Section — Timber stud wall
exteriorinterior

Total build-up 199 mm · 39 kg/m² of material.

Layers (exterior → interior)
studs + plates (38×140 @ 600 smeared solid)
11 mm OSB sheathing
140 mm batt between studs
12.5 mm inner lining
19 mm timber cladding

Framing convention: studs/rafters/beams are entered as an equivalent solid thickness (or switched to kg/m²) — the same smearing Eco-Architect and Assayer use, so numbers stay comparable across the Toolkit.

The needle
16kgCO2e/m² · band 12–19
1050100500

Product stage A1–A3 only — no transport to site, construction, replacement or end of life. Teaching values with real spread (the grey band); pull a current EPD before quoting one professionally.

Where it sits
  • Softwood (sawn) — studs + plates (38×140 @ 600 smeared solid)2.3 · 15%
  • OSB — 11 mm OSB sheathing3 · 19%
  • Glass wool — 140 mm batt between studs5.1 · 33%
  • Plasterboard — 12.5 mm inner lining2.5 · 16%
  • Softwood (sawn) — 19 mm timber cladding2.7 · 17%

Biogenic line (separate): the timber layers hold ≈ 41 kg of CO2 as wood (EN 16449 form) — stored until end of life, not subtracted from the 16 above. Stored ≠ saved.

Ask the coach

Propose your own swap first — the coach responds to your idea, it never moves first.

Compare bench

Save revealed assemblies here to see them side by side.