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Do I need a damp survey when buying a house?

Most buyers do not need a separate damp survey. Many do, and the usual trigger is a line in the mortgage valuation or homebuyer report saying that damp readings were found and a specialist should be consulted. This guide explains when a damp survey is worth having, what it adds to the survey you already have, and how to use it before exchange.

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What your homebuyer or building survey does

A RICS Home Survey or similar report is a general inspection of the whole property. The surveyor will usually take some moisture meter readings at low level and note anything high. They are not expected to diagnose the cause in detail, and where readings are high they commonly recommend further investigation by a damp specialist.

That recommendation is the moment buyers are most vulnerable. The specialist is often a treatment firm offering a free survey, and the result is often a quote for injection and replastering that the seller is then asked to pay for or that the buyer takes on.

When a separate damp survey is worth it

In those cases an independent survey tells you what the readings actually mean, what is causing them, and what a proportionate repair would cost, before you are committed.

  • The homebuyer or building survey recommends a damp or timber specialist
  • The property is period, listed, timber framed or built of stone, flint or chalk
  • There are cellars, basements or rooms below ground level
  • You can see tide marks, mould, blown plaster or a musty smell on viewing
  • The seller has had damp proofing done and is offering a guarantee
  • The property is a converted flat where damp might come from another part of the building

What an independent damp survey adds

It identifies the cause, rather than recording that a wall is damp. It separates live problems from historic ones, such as old woodworm or salts left by a long fixed leak. It tells you which repairs are maintenance, which are urgent, and which are not needed at all. And it does that without a sales motive, because we carry out no remedial work.

The report arrives within 24 hours of the visit, which matters when you are working to an exchange date.

Using the report in negotiation

A clear report with photographs and a specification is a strong basis for asking the seller to reduce the price, to carry out a specific repair before completion, or to agree a retention. It is far more persuasive than a generic damp comment, because it states the cause and the proportionate fix.

Equally, a report that finds no significant problem can let you proceed with confidence, and stop a seller being pushed into paying for treatment that the house does not need.

Damp proofing guarantees on a house you are buying

If the seller had damp proofing done, ask for the guarantee and the original survey. Check what it covers, usually rising damp through the treated walls, whether it is transferable, and whether the company or an insurance backed scheme still stands behind it. A guarantee is only useful if the treatment addressed the actual cause. Our survey can tell you whether it did.

Questions

How soon can you survey before exchange?

We reply to every enquiry the same day and usually visit within a few days. The report follows within 24 hours of the visit.

Do I need the seller's permission?

You need access, which is usually arranged through the estate agent. Our survey is non invasive by default, so nothing is disturbed without the owner's agreement.

Will my lender accept your report?

Lenders deal with specialist reports routinely. If the valuer has asked for a damp report, ours gives the cause and the recommended work in a form they can use.

Should I ask the seller to do the damp proofing?

Only if it is the right work. It is often better to agree a price reduction and arrange the proportionate repair yourself, so it is done properly.

Can you survey a flat as well as a house?

Yes. For flats, the report also identifies whether any damp comes from a part of the building that is the freeholder's responsibility.

What does it cost?

Our fees are fixed before the visit and published on our prices page.

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