Damp Proofing Cost & Pricing Guide
Damp proofing pricing depends mainly on the extent of the damp, the length of wall affected and whether re-plastering or waterproofing is needed — treating one tide-marked wall costs far less than tanking a whole cellar. The figures below are a starting guide; every job gets a fixed written quote after the survey, before we book a date.
Quick answer
A standard domestic damp survey is free, with DPC injection from £350 per wall, salt-resistant re-plastering from £600 per room and basement tanking from £1500. Every job gets a fixed written quote after the survey — the final figure depends on the extent of the damp, wall length and whether re-plastering is needed.
What affects the price?
- • Extent of the damp — a single tide-marked wall costs far less than damp affecting several rooms.
- • Type of damp — rising, penetrating and condensation damp are diagnosed by survey and treated in different ways.
- • Wall length & re-plastering — DPC injection is priced by length, and salt-resistant re-plastering afterwards adds to the job.
- • Access — clear, easy access to the affected walls is quicker than restricted or awkward areas.
- • Basement waterproofing scale — tanking or membrane systems for cellars are quoted per project after survey.
Damp Proofing Price Guide
Indicative pricing — every job gets a fixed, written quote after a survey. No hidden extras.
Damp survey & report
diagnosis
Free
Free for straightforward jobs; a detailed independent survey report is available for mortgage or purchase cases.
DPC injection (per wall)
rising damp
from £350
Chemical damp-proof course injection to a single affected wall — priced by length and access.
Damp-proof re-plaster
per room
from £600
Salt-resistant re-plastering after treatment, so the wall can be redecorated cleanly.
Basement / cellar tanking
waterproofing
from £1500
Structural waterproofing (tanking or cavity membrane) — quoted per project after survey.
DIY vs Painting Over vs Professional Treatment
How the three common ways of dealing with a damp wall actually compare.
Swipe sideways to see all columns →
| Factor | DIY fix | Painting over it | Professional treatment |
|---|---|---|---|
| Getting the cause right | Easy to misdiagnose — treating condensation as rising damp is common | Ignores the cause entirely — the damp is still there behind the paint | Survey first, so the actual cause is identified before any work |
| How long it lasts | Often returns if the real source isn’t dealt with | Weeks or months — damp and mould bleed back through | Treated at source and backed by a written workmanship guarantee |
| Damage to the property | Risk of making it worse or masking a spreading problem | Damp keeps working on plaster, timber and decoration underneath | Problem stopped before it reaches timber and structure |
| Cost over time | Cheap up front, expensive if the problem spreads | Cheapest short term, most expensive long term | Priced once, fixed properly, guaranteed |
| Suitability for a sale | No report or guarantee to satisfy a buyer or lender | A surveyor will still flag the underlying damp | Independent report and guarantee that help keep a sale moving |
Pricing FAQ
How much does damp proofing cost in your area?
Most single-wall damp-proof course treatments in your area start from around £350, with a full room including salt-resistant re-plastering nearer £600–£1,200 depending on size and access. We always confirm a fixed price in writing after a survey — no hidden extras.
Is there a charge just for a quote?
No. A survey and fixed written quote for standard domestic damp work are free with no obligation to book. Only a formal independent survey report is a separate, paid service, which we agree with you beforehand.
Is the damp survey really free?
For most straightforward domestic jobs, yes — a survey and fixed quote are free with no obligation. A detailed independent report (for a house purchase, mortgage or dispute) is a paid, separate service, which we confirm up front.
Do you provide a report for a house sale or mortgage?
Yes. If a mortgage valuation or buyer’s survey has flagged damp, we can carry out an independent specialist damp survey and provide a written report and quote — often what’s needed to keep a sale moving.
Damp is treated by cause, not by symptom: rising, penetrating and condensation damp look similar but need completely different treatments, which is why every job starts with a proper survey and diagnosis before any work is quoted.
Book a free damp survey today
Tell us about the damp and your postcode — we'll arrange a survey and a fixed written quote.