UK · Updated 2026 · Explainer
Part Z & Embodied Carbon: Using Surplus Reclaimed Yellow Stock Bricks in Doncaster
Whole-life carbon assessments are becoming mandatory on Doncaster projects. Reclaimed and surplus yellow stocks 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 yellow stocks typically avoids 60–95% of the A1–A3 embodied carbon of a new equivalent. On a mid-size Doncaster 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 Doncaster
- Yard invoice with weight/quantity
- Photos and batch references
- Manufacturer EPD comparison for baseline
- Site delivery notes
Cost of yellow stocks vs carbon benefit
| Grade | Typical price | Notes |
|---|---|---|
| Job-lot / bulk | £780 per 1,000 | Merchant clearance, palletised |
| Standard graded | £1,590 per 1,000 | Sorted, ready-to-fit stock |
| Heritage / premium | £2,400 per 1,000 | 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 do I clean lime-mortar off?
Brick acid diluted 1:10, brushed on and rinsed. Never sandblast.
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