UK · Updated 2026 · Explainer
Part Z & Embodied Carbon: Using Surplus Reclaimed Oak Beams in Colchester
Whole-life carbon assessments are becoming mandatory on Colchester projects. Reclaimed and surplus oak beams is the fastest lever for reducing A1–A3 embodied carbon in East of England. This 2026 guide shows the numbers and the evidence you need.
Embodied carbon savings
Reclaimed oak beams typically avoids 60–95% of the A1–A3 embodied carbon of a new equivalent. On a mid-size Colchester 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 Colchester
- Yard invoice with weight/quantity
- Photos and batch references
- Manufacturer EPD comparison for baseline
- Site delivery notes
Cost of oak beams vs carbon benefit
| Grade | Typical price | Notes |
|---|---|---|
| Job-lot / bulk | £85 per m | Merchant clearance, palletised |
| Standard graded | £203 per m | Sorted, ready-to-fit stock |
| Heritage / premium | £320 per m | 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 finish a reclaimed oak beam?
Wire-brush, then apply Osmo Polyx-Oil or hard-wax oil. Avoid heavy varnish.
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