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Damp proofing cost: what it really costs in 2026
Per metre, by treatment.
£80 – £280 /m
A damp-proof course injection starts around £80 per metre of wall. Membrane systems run about £160/m, and full tanking £280/m.
Price by spec
| Option | What it means | Typical price |
|---|---|---|
| DPC injection | Rising damp in walls | £80 /m |
| Membrane system | Persistent damp, uneven walls | £160 /m |
| Tanking | Below-ground or severe cases | £280 /m |
What actually happens
- Independent survey — find the actual cause first
- Skirting off and plaster hacked back to brick
- Treatment applied: injection, membrane or tank coat
- Walls left to dry (longer than you'd think)
- Re-plastered with salt-resistant render
- Skirting and decoration once fully dry
Popular choices
Cavity drain membranesBreathable lime plaster on period homesImproved ventilation alongside treatment
Regulations to know
- No specific regulations — but beware: most 'rising damp' is actually condensation or a leak, which injection won't fix
- Use a PCA-member surveyor and get an insurance-backed guarantee
Tips from the trade
- Pay for an independent survey, not a free one from the company selling the treatment
- Fix gutters, ground levels and ventilation first — half of damp jobs need no chemicals at all
Plan this project properly
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Start planning on QomePrices on this page are approximate, region-adjusted guide figures built from cross-checked UK cost data. They exist to inform you, not to bind anyone. Actual prices are whatever you and your tradesperson agree, and a difference between a Qome guide figure and a real quote is not a fault in either.