UK · Updated 2026 · Explainer
Part Z & Embodied Carbon: Using Surplus Reclaimed York Stone Paving in Leeds
Whole-life carbon assessments are becoming mandatory on Leeds projects. Reclaimed and surplus York stone is the fastest lever for reducing A1–A3 embodied carbon in Yorkshire. This 2026 guide shows the numbers and the evidence you need.
Embodied carbon savings
Reclaimed York stone typically avoids 60–95% of the A1–A3 embodied carbon of a new equivalent. On a mid-size Leeds project this can equal 4–12 tonnes CO₂e avoided.
Part Z timeline and what it requires
- Whole-life carbon assessment on all major projects
- Reporting to a central UK register
- Alignment with RICS WLCA methodology
- Evidence of material provenance
Building a compliant evidence pack in Leeds
- Yard invoice with weight/quantity
- Photos and batch references
- Manufacturer EPD comparison for baseline
- Site delivery notes
Cost of York stone vs carbon benefit
| Grade | Typical price | Notes |
|---|---|---|
| Job-lot / bulk | £55 per m² | Merchant clearance, palletised |
| Standard graded | £98 per m² | Sorted, ready-to-fit stock |
| Heritage / premium | £140 per m² | Character grade, hand-picked |
Frequently asked questions
+Is Part Z law yet?
Not yet fully — it's a private-members bill and industry alignment. Adoption on public and BREEAM projects is already widespread.
+How is carbon quantified for surplus?
A1–A3 emissions are usually set to zero for genuine reclaim; A4 (transport) uses actual distance.
+How thick for a driveway?
Minimum 65mm on a full mortar bed. 50mm is fine for footpaths and patios.
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