The short answer
A focused, independent damp survey in the UK typically costs £150–£350. Price depends on property size and age, location, how many problems are being investigated, and whether timber (rot and woodworm) is included. “Free” surveys from damp-proofing firms cost nothing up front but are sales visits, not impartial diagnoses. A paid independent survey is cheap insurance against being sold the wrong cure — which can run into thousands.
A damp survey is one of the lowest-cost, highest-value steps you can take when damp appears. For a modest fee you get a written diagnosis that can save you from an unnecessary — and far more expensive — remedial job. Here is what surveys cost in 2026, what drives the figure, and how to read the difference between a free and a paid survey.
Survey costs at a glance
- Focused damp survey £150–£350
- With timber / rot report Towards the upper end
- RICS Home Survey (buying) Priced separately, by property
- “Free” contractor survey £0 up front — but a sales visit
- Best value Independent paid survey, fixed fee
What you typically pay
For a standalone, independent damp survey of a typical UK home, expect to pay roughly £150–£350 in 2026. The fee covers the inspection and a written report; it does not include any remedial work. A combined damp and timber survey — adding checks for wet rot, dry rot and woodworm in floors, joists and roof timbers — sits towards the upper end of that range or a little above, because it takes longer and covers more of the structure. The figure buys you a professional’s time on site, the interpretation of moisture readings, and a document you can rely on when commissioning work.
What changes the price
- Property size and age — a large or older building takes longer to inspect and read accurately, with more walls, more floors and more potential defects.
- Location — fees in London and the South East tend to be higher, reflecting surveyors’ overheads and travel.
- Scope — one damp patch versus a whole-house investigation, and damp-only versus damp-and-timber, change both time and price.
- Access — concealed areas, raised suspended floors, restricted access or the need for sample testing (calcium-carbide or laboratory analysis) all add time.
- Report depth — a brief letter of findings costs less than a full report with photographs, moisture profiles and a phased remedial specification.
| Survey type | Typical 2026 cost | What’s included |
|---|---|---|
| Focused damp survey | £150–£350 | Diagnosis of one damp problem + written report |
| Damp & timber survey | Upper end of range | Damp plus rot and woodworm |
| “Free” contractor survey | £0 | Inspection by a firm selling the treatment |
Free versus paid — the real cost
A “free survey” from a damp-proofing company is not the bargain it appears. The inspector is paid by selling remedial work, so the incentive runs towards finding a chemical cure. The cost arrives later, when you are quoted for a damp-proof course or extensive replastering you may not need. RICS and the PCA both highlight misdiagnosis — typically condensation sold as rising damp — as the sector’s most expensive error. An independent survey, by contrast, is bought from someone with no stake in the outcome, so the diagnosis is impartial and the report is genuinely yours to use.
Putting the fee in perspective
What changes the price
Several factors move a survey fee within the £150–£350 band. Property size and number of affected rooms matter most: a one-bed flat with a single damp wall sits at the lower end, while a large period house with multiple elevations sits higher. Including a timber inspection for rot and woodworm adds to the fee but is sensible in older or previously treated properties. Travel to remote locations, the depth of report you need — a short letter versus a detailed photographic report with a schedule of works — and whether you want the surveyor to specify remedial works all push the figure up. A genuinely independent surveyor charges a fee precisely because they sell no treatment; a free “survey” from a contractor costs nothing because its purpose is to quote for work. The fee buys impartiality, which is the whole point of paying for one.
Treat the survey fee as the entry cost to spending wisely. A focused survey at the lower end of the range can prevent a four-figure remedial bill for the wrong cure; even at the upper end, with timber included, it is a fraction of the cost of injected DPCs, replastering or rebuilding work. For the figures behind the cures themselves, see our pages on damp-proofing cost and mould removal cost. This page is general information, not a quotation or site-specific survey, and not legal advice; always confirm the fee and scope in writing before instructing a surveyor.
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Frequently asked questions
How much is a damp survey in 2026?
A focused, independent damp survey typically costs £150–£350 in the UK. A combined damp and timber survey sits at the upper end because it covers rot and woodworm too.
Why are some damp surveys free?
Free surveys are usually offered by firms that also sell damp-proofing. They cost nothing up front but are sales visits, so the diagnosis may be skewed towards work the firm can carry out.
Is a paid survey worth it?
Almost always. A few hundred pounds for an impartial diagnosis is cheap against the £2,000–£5,000 a needless whole-house damp-proofing job can cost.
Does the survey fee include any work?
No. The fee covers the inspection and written report only. Any remedial work is quoted and priced separately, ideally by getting like-for-like quotes against the report.
Sources & further reading
- RICS — Investigation of moisture and its effects in traditional buildings
- Property Care Association (PCA) — guidance on commissioning a damp survey
- gov.uk — Housing Health and Safety Rating System (HHSRS): damp and mould
This guide is general information, not a site-specific survey, medical advice or legal advice. Damp and mould should be assessed by a qualified surveyor, and health concerns discussed with a GP or the NHS.