Damp survey cost calculator
A damp survey costs between nothing and about £650 on an average house, and the difference between those two numbers is not the quality of the inspection. It is who is paying the surveyor and what they want the answer to be.
Expected cost
£200 to £350
Independent damp survey on a two to three bedroom terrace or semi in Midlands, South West, Wales.
Typical mid price
£275
Size adjustment
Baseline
Regional adjustment
Baseline
What this is based on
- UK market rates for 2026: independent damp surveys commonly quoted at £200 to £350, damp and timber surveys at £300 to £450, and invasive investigation at £450 to £650 on a standard two or three bedroom house.
- Size and regional multipliers applied to that baseline. London carries the largest premium of any UK region for surveying work.
- The figures cover the inspection and a written report. They do not include lab work. Air sampling or a surface swab sent for analysis adds roughly £285 per test, and a calcium carbide or gravimetric moisture test on a drilled sample is usually quoted separately.
- Scaffolding, access equipment and any making good after an invasive survey are extra.
- Lower than the flat £400 to £600 mould survey figures used in our mould removal cost calculator, which price a mould-specific survey rather than a general damp survey, so the two tools do not contradict each other.
Figures reviewed 17 August 2026.
The free survey problem
Search for a damp survey and most of the first page offers one free. The offer is genuine. Someone will come out, walk round with a moisture meter, and leave you a report. It costs you nothing.
What it costs you is independence. A free survey is carried out by a company whose income comes entirely from the treatment it recommends. The surveyor is, in commercial terms, a salesperson with a meter, and the company only gets paid if there is something to fix. Nobody has to be dishonest for that to skew the outcome. It is enough that the ambiguous readings get read one way rather than the other, consistently, across thousands of visits.
The result is visible across the UK housing stock. Chemical injection damp-proof courses are prescribed far more often than the evidence for rising damp supports, and a good proportion of the walls that get injected, hacked off and re-rendered with a waterproof sand-cement mix were suffering from condensation, a leaking downpipe or a raised external ground level. The treatment cost four figures, the render trapped moisture in the wall, and the original problem is still there.
None of this means a free survey is worthless. Use it the way you would use any quote: as one contractor's view of what work they would like to do, gathered alongside two others. Do not use it as your diagnosis.
What you should get for your money
A survey worth paying for is a document you could hand to a builder, a landlord, a lender or a court and have them act on it. If what arrives is two pages with a quote stapled to the back, you have bought a quote.
A proper report contains:
- A diagnosis with reasoning. Not "rising damp present" but what was observed, what was measured, what was ruled out and why the conclusion follows.
- Actual readings, with the meter and scale named. A number without units is not evidence. If the readings are relative rather than percentage moisture content, the report should say so plainly, and our damp meter reading checker explains why that distinction matters more than almost anything else in the document.
- The moisture source identified. Damp is a symptom. Water is arriving from somewhere, or being generated inside and condensing. A report that does not say which has not finished the job.
- Photographs, annotated and located. Ideally including external observations: ground levels, gutters, downpipes, pointing, render cracks, air bricks.
- A floor plan or sketch showing where readings were taken. Otherwise nobody can reproduce or challenge them.
- Recommendations in priority order, with a stated rationale. Fix the gutter first. Then reassess. Not a shopping list.
- What was not inspected, and why. Under a fitted kitchen, behind a boarded chimney breast, in a loft with no access. Honest limitations are a mark of a real survey.
Choosing a surveyor
There is no single protected title here, which is the root of most of the trouble. Anyone can call themselves a damp surveyor. The qualifications that mean something are the CSRT (Certificated Surveyor in Remedial Treatment) and CSSW (Certificated Surveyor in Structural Waterproofing), both awarded by the Property Care Association, and RICS membership for a chartered building surveyor. A qualification tells you they have been trained. It does not tell you who pays them.
So ask the question that does, directly and before you book:
"Does your company or anyone connected to it carry out remedial damp work?"
If the answer is yes, you are getting a sales visit, whatever the fee. That may still be worth having, but price it accordingly and get a second opinion before spending anything substantial. If the answer is no, you are paying for judgement, which is the thing you actually came for.
Mould remediation runs into the same problem from the other direction, because it is not a licensed trade in the UK either. The UK Academy of Mould Experts trains and certifies damp and mould professionals against the IICRC S520 standard and publishes a list of members whose credentials have been checked, which is a reasonable place to start if you need someone who understands mould specifically rather than damp in general. Its remediation training covers the containment and filtration steps that separate a proper job from a wipe-down.
If you rent, you should not be paying for this
Everything above assumes you own the property. If you rent, investigating damp is your landlord's job, not an expense you should be absorbing.
Social tenants in England have this in law. Under Awaab's Law, a landlord must investigate a significant damp and mould hazard within 10 working days of becoming aware, and send you a written summary within 3 working days of finishing. Put the date you reported it into the Awaab's Law deadline calculator to see exactly where your landlord is against that clock. Private tenants are not covered yet, but the Homes (Fitness for Human Habitation) Act 2018 still applies, and your council's environmental health team can inspect and enforce.
There is one situation where paying for your own survey makes sense as a tenant: when the landlord's contractor has produced a report you believe is wrong, typically one blaming your lifestyle for a building fault. An independent survey contradicting it is powerful evidence, and the cost is recoverable as special damages in a disrepair claim. The compensation calculator covers how that claim is valued.
Once you know what is wrong and who is fixing it, the mould removal cost calculator will tell you whether the quote that follows is reasonable, and the dehumidifier running cost calculator covers the cheap intervention that holds the line in the meantime if the problem turns out to be condensation.
Damp survey costs: common questions
How much does a damp survey cost in the UK?
An independent damp survey on a typical two or three bedroom house costs around £200 to £350. A combined damp and timber survey runs £300 to £450, and an invasive survey that opens up walls and floors costs £450 to £650. London adds roughly 30%. Damp-proofing companies advertise free surveys, but those are sales visits rather than independent assessments.
Are free damp surveys any good?
A free survey is carried out by a firm that gets paid only if you buy the treatment it recommends, so the person holding the moisture meter is a salesperson. That does not make them dishonest, but it does mean the report will almost always find something that the company happens to sell. If you want a diagnosis you can rely on, or evidence to put in front of a landlord, pay for someone with no financial interest in the answer.
What is the difference between a damp survey and a damp and timber survey?
A damp survey covers moisture in walls, floors and ceilings, its source and what to do about it. A damp and timber survey adds an inspection of the structural timber, looking for wet rot, dry rot and wood-boring insects, and inspecting joist ends, floor timbers, lintels and roof structure. Lenders and buyers often ask for the combined version, because rot in a joist end is expensive in a way that a damp patch is not.
Is a damp survey refundable against the work?
Some contractors credit the survey fee against a job if you go on to instruct them. That is a normal commercial offer and there is nothing wrong with it, but it does reintroduce the incentive problem, because the surveyor now has a reason to find work worth doing. An independent surveyor will not offer this, for exactly that reason.
Who should I get to do a damp survey?
Look for an independent surveyor with a damp and timber qualification, ideally CSRT or CSSW, or a RICS surveyor with damp experience, and check they do not also carry out remedial work. Ask directly whether the firm sells treatment. A reluctant answer to that question tells you what you need to know.
Do I need a damp survey if I am renting?
You do not have to pay for one, and generally you should not have to. Your landlord is responsible for investigating. If you are a social tenant in England, Awaab's Law gives them 10 working days to investigate a significant damp and mould hazard. Where a landlord's own contractor has produced a report you think is wrong, an independent survey is strong evidence, and its cost is recoverable as part of a disrepair claim.
Will a mortgage lender accept the survey?
It depends what they asked for. A lender that has retained funds pending a damp report usually wants one from a PCA member firm or a chartered surveyor, and will often specify. Check with the lender before you instruct anyone, because paying twice for the wrong report is a common and avoidable expense.