Damp Survey Cost Calculator

How much does a damp survey cost?

A damp survey diagnoses why a property is wet – rising damp, penetrating damp, condensation or timber rot – and what to do about it. The cost depends on two things: who does it and how big the property is. An independent damp survey from a chartered surveyor or CSRT-qualified specialist typically costs £250–£650, while damp-proofing contractors often offer a “free” survey – but that is a sales visit designed to sell you remedial work. This calculator gives an indicative price for your situation and, just as importantly, explains why the cheapest survey is not always the one that saves you money.

Independent survey vs free contractor quote

• Independent surveyor – you pay a fee, but the surveyor has no products to sell, so the report tells you the real cause. Often that is condensation or a leaking gutter, not rising damp, and the fix is far cheaper than a chemical damp-proof course.
• Damp-proofing contractor – the “free” survey is a sales appointment. The person inspecting is paid to recommend the treatment their company installs, so a diagnosis of “rising damp needing a new DPC” is common even when the true cause is something else.
• Property size – more walls, floors and rooms mean more time on site, so a large detached house costs more than a one-bed flat.

Worked example

An owner of a 3-bedroom house notices damp patches on a downstairs wall. A local damp-proofing firm offers a free survey and quotes £3,000 for a chemical DPC and re-plastering. Instead, the owner pays around £350–£550 for an independent survey, which finds the cause is a bridged cavity and a leaking downpipe. The real fix costs a few hundred pounds – so the survey fee saves thousands and prevents unnecessary, disruptive work.

Frequently asked questions

How much does a damp survey cost?

An independent damp survey from a chartered surveyor or CSRT-qualified specialist typically costs between about £250 and £650 in the UK, depending on property size. Damp-proofing contractors often offer a free or low-cost survey, but that is tied to selling you remedial work.

Are free damp surveys any good?

A free survey from a damp-proofing company is a sales visit, not an independent diagnosis – the surveyor is paid to recommend the treatment their firm sells, often a chemical damp-proof course. For an unbiased opinion on the real cause, pay for an independent survey from someone with no products to sell.

What is included in a damp survey?

A damp survey inspects walls, floors and timbers for rising damp, penetrating damp, condensation and rot, using moisture meters and sometimes deeper investigation. A good report identifies the true cause, not just the symptom, and recommends proportionate repairs rather than blanket treatment.

Do I need a damp survey to buy a house?

It is not compulsory, but if a mortgage valuation or a home survey flags damp, lenders often want a specialist damp report before releasing funds. Getting an independent one first can also give you room to negotiate the price down.

Does property size change the survey cost?

Yes. A larger house has more walls, floors and rooms to inspect, so surveyors charge more. A small flat sits at the bottom of the range and a large detached house at the top, with mid-size homes in between.

Is a damp survey the same as a full building survey?

No. A full building survey (Level 3) looks at the whole property, while a damp survey focuses only on moisture, timber and rot. If damp is your main concern a targeted damp survey is cheaper; if you are buying an older property a full survey that includes damp may be better value.

Cost figures are indicative UK market ranges for 2026 and vary by surveyor, property and region – they are not a quote. For independent damp and timber expertise, look for RICS or Property Care Association (CSRT) qualified surveyors; general home-buying guidance is at GOV.UK – How to buy a home.