What will damp proofing cost?
A starting figure before you call a damp specialist. Pick the type of damp, how much of the property is affected and your region, and we give you an indicative UK price range with the usual extras broken out. A budget to plan around before the quotes come in. Free, no sign-up. The right first step is to find the cause — a leak, failed pointing, poor ventilation — because treating the symptom without the cause just wastes money.
A guide, not a quote. The ranges are typical 2025/26 UK prices — the specialist's labour, materials and a normal job, inclusive of VAT — drawn from published industry averages. They exclude any major structural repair, underpinning, a full basement conversion, or fixing the source defect itself (a roof, gutter or plumbing leak). Every property is different: the only real number is a written, fixed-price quote after a proper diagnosis, and you should get at least three. Nothing you type leaves your browser.
The type of damp sets the fix — and find the cause first.
Four kinds of damp, four different fixes. Rising damp is moisture wicking up from the ground where the original damp-proof course has failed or been bridged — the fix is a new chemical DPC injected into the wall, plus replastering. Penetrating damp is rain getting through the wall, usually via cracked render, failed pointing or a defect, and is fixed by repairing the wall, not by injecting anything. Condensation (and the black mould that comes with it) is warm, moist indoor air meeting cold surfaces — a ventilation problem, fixed with extractors or a PIV unit. A wet basement or cellar is waterproofed by tanking or a membrane system — specialist, often-structural work in a different price bracket.
Diagnosis matters more than treatment. Damp work attracts a lot of mis-selling. Firms that sell chemical DPCs have an incentive to diagnose rising damp, which is in truth far less common than it's claimed — bridged DPCs, high external ground levels, leaks and condensation are routinely misread as rising damp. Pay an independent, non-selling surveyor (ideally CSRT-qualified) to find the real cause before you commit to any treatment, and get at least three quotes.
Replastering is part of the rising-damp job. A chemical DPC on its own rarely fixes the look of the wall — the old plaster is contaminated with hygroscopic ground salts that keep drawing moisture and staining through. It normally has to be hacked off and renewed to about a metre, which is why we include it by default. Skip it and the damp marks can come straight back through the old plaster.
Condensation is ventilation, not chemicals. If the problem is misted windows, mould in corners and on cold walls, no amount of injected DPC will help. The lasting fix is moving the moist air out — a good bathroom and kitchen extractor, or a whole-house PIV unit — plus heating and airing the home. It's far cheaper than "damp proofing", so be wary of anyone who wants to inject a wall for it.
Basements are a specialism of their own. Waterproofing a below-ground room is governed by BS 8102 and should start with a proper waterproofing design by a qualified surveyor. Costs vary enormously with how wet the ground is and whether structural repair is needed, so treat any basement figure here as very rough indeed.
Keep your home's damp history in one place.
Stead holds the survey, the treatment date and any guarantee — many DPC treatments carry a 20–30 year guarantee worth keeping — so the paperwork's to hand for a claim or a sale, and you can prove what was done and when.