UK · Updated 2026 · Explainer
Part Z & Embodied Carbon: Using Surplus Reclaimed Sash Windows in Glasgow
Whole-life carbon assessments are becoming mandatory on Glasgow projects. Reclaimed and surplus sash windows is the fastest lever for reducing A1–A3 embodied carbon in Scotland. This 2026 guide shows the numbers and the evidence you need.
Embodied carbon savings
Reclaimed sash windows typically avoids 60–95% of the A1–A3 embodied carbon of a new equivalent. On a mid-size Glasgow 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 Glasgow
- Yard invoice with weight/quantity
- Photos and batch references
- Manufacturer EPD comparison for baseline
- Site delivery notes
Cost of sash windows vs carbon benefit
| Grade | Typical price | Notes |
|---|---|---|
| Job-lot / bulk | £180 per window | Merchant clearance, palletised |
| Standard graded | £515 per window | Sorted, ready-to-fit stock |
| Heritage / premium | £850 per window | 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.
+Are draughty sashes energy-efficient?
Refurbished with Reddiseals or Slimlite they achieve U-values under 1.6 W/m²K.
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