How Much Does Damp Proofing Cost in the UK?
Damp proofing cost depends on the type of damp and the treatment. A chemical damp-proof course is priced per wall or per metre; tanking a cellar or replastering afterwards adds to it.
A single-wall DPC at the low end; whole-house treatment or basement tanking at the top.
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Cost by job
What affects the price
- •The type of damp — rising, penetrating or condensation each need different (and differently priced) treatments.
- •The number and length of affected walls.
- •Replastering — salt-contaminated plaster usually has to be hacked off and renewed after a DPC, which is a big part of the cost.
- •Access and whether furniture, skirting and floors have to be lifted.
- •Underlying causes — fixing external ground levels, guttering or bridging may be needed first.
Regional price variation
Labour is the biggest regional swing. London and the South East typically run 20–30% above the national average, while the North of England, Scotland and Wales tend to sit 5–15% below it. Material prices are fairly consistent nationwide — it is day rates that move the total. The ranges on this page assume South of England pricing unless stated.
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Frequently asked questions
How much does damp proofing cost in the UK?
Damp proofing costs anywhere from £300 for a single-wall injected damp-proof course to £2,000–£5,000 for whole-house rising damp treatment. Basement tanking can be £3,000–£10,000 or more. Replastering afterwards adds £300–£700 per wall.
How much is a damp-proof course?
A chemical (injected) damp-proof course costs around £70–£120 per metre, or £300–£1,000 per wall, before replastering. A damp survey to confirm the cause first is £150–£350.
Do I need to replaster after damp proofing?
Usually yes. Rising damp leaves salts in the old plaster that keep drawing moisture, so the affected plaster is normally hacked off and renewed after a new DPC. This is often the largest part of the total cost.