UK · Updated 2026 · Buying guide
Cheap Insulation Board UK: PIR, EPS and Rockwool at Trade Clearance Prices
Insulation is the fastest-moving surplus category in the UK. Every over-ordered PIR sheet, damaged Rockwool bat and end-of-line EPS pallet ends up somewhere — usually a skip. SurplusBuilder connects that stock to self-builders and small trades who don't need pristine merchant packaging.
2026 surplus insulation prices vs merchant
| Product | Merchant £/m² | Surplus £/m² | Saving |
|---|---|---|---|
| PIR 100mm | £22.50 | £8.90 | 60% |
| PIR 50mm | £12.80 | £5.10 | 60% |
| EPS 100mm | £9.40 | £3.80 | 60% |
| Rockwool RWA45 50mm | £11.20 | £4.50 | 60% |
What 'seconds' actually means
Most surplus PIR is A-grade with a corner ding, foil scuff or slightly split label. Performance is identical. Reject anything with delamination, wet foil or a musty smell — that indicates water damage.
Where to buy surplus insulation in the UK
- Manchester — largest PIR surplus flow in the North
- Bristol — self-build hub, high EPS turnover
- London — Rockwool acoustic bats from fit-outs
Frequently asked questions
+Is surplus PIR still A-rated?
Yes. Thermal performance is set by the foam chemistry, not the packaging. Provided the sheet is dry and un-crushed, lambda values are unchanged.
+Can I use surplus insulation on Building Control jobs?
Yes, if the product is BBA-certified and you retain the batch label. Ask the seller for a photo of the label before you buy.