UK · Updated 2026 · How-to
Reclaimed Sash Windows for Energy Retrofit in Cardiff: 2026 Sourcing Guide
Cardiff retrofits — from PAS 2035 refurbs to EnerPHit self-builds — rely on high-spec materials at cost. Surplus and clearance stock delivers the same certified spec at 40–60% less. Here's the 2026 sourcing map for Wales.
Retrofit-relevant sash windows sources
- Merchant clearance on certified stock
- Manufacturer over-orders (PIR, mineral wool, plasterboard)
- Cancelled project surplus in your postcode
- Regional trade Facebook groups
Certification you must preserve
- BBA certificate on insulation and boards
- Batch/lot number for U-value calculations
- Fire rating on partition materials
- Datasheets for PAS 2035 evidence packs
2026 Cardiff pricing
| 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 |
Collection and delivery inside Cardiff
Most Cardiff sellers hold stock inside CF10, CF11 and CF14 and offer South Wales next-day £48–£75. For loads over a tonne of sash windows, a hiab drop is usually more economical than multiple van runs.
Frequently asked questions
+Does surplus sash windows count for PAS 2035?
Yes when spec and certification are preserved. Keep batch numbers and BBA certificates with your evidence pack.
+Are draughty sashes energy-efficient?
Refurbished with Reddiseals or Slimlite they achieve U-values under 1.6 W/m²K.
+Can I use surplus on ECO4-funded work?
Yes — ECO4 assessors care about spec and installation quality, not new-vs-surplus provenance.
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