Selling a house with damp

Yes, you can sell a house with damp. The most useful thing you can do first is find out what kind of damp it is and what's causing it, because that decides whether you're looking at a cheap fix or a big job, and what a buyer will knock off the price. Then answer the buyer's questions honestly and hand over any paperwork you have.

This guide covers the types of damp, getting a proper diagnosis, what you have to disclose in England and Wales, how buyers and lenders react, and your options for selling.

What type of damp is it?

Government guidance on damp and mould describes four main types:

Type	What it is	Typical signs	Usual fix
Condensation	Moisture from cooking, showers and drying washing settling on cold surfaces. The most common type.	Black mould on walls and window frames, steamed-up windows, musty smell	Better ventilation, heating and extractor fans
Penetrating damp	Water getting in from outside through faults in walls, roofs, windows or floors	Patches that grow after rain, often on outside walls or ceilings	Repair the fault: gutters, downpipes, roof, pointing, render or seals
Rising damp	Moisture rising from the ground through walls and floors, usually in older homes, often where the damp-proof course has failed	A "tide mark" low on ground-floor walls, crumbling plaster, salts	Specialist investigation and repair
Leaks and floods	Water from burst or leaking pipes, overflowing baths or sinks, neighbours or flooding	Sudden staining, often below bathrooms and kitchens	Fix the leak, then dry out the structure

The guidance notes that rising damp should be confirmed by testing, not assumed. Several types can also happen at once, for example a blocked gutter causing penetrating damp that then shows up as mould.

Get the cause diagnosed before you decide

Damp is easy to misread, and the wrong treatment can cost a lot and fix nothing. The government guidance says an in-person inspection is better than judging from photos, and lists things worth checking:

• Outside: blocked or broken gutters and downpipes, cracked render, failed window seals, and soil or paving piled up above the damp-proof course (known as "bridging").
• Inside: poor insulation, cold walls, broken extractor fans and heating that isn't working well.

If the cause isn't obvious, ask a qualified surveyor to look. An independent surveyor who isn't selling a treatment can give you a more neutral view. RICS home surveys come in three levels, and a Level 3 survey is the most detailed.

Damp also matters for health. The same guidance links damp and mould to breathing problems, asthma and infections, especially for children, older people and anyone with a lung condition or a weakened immune system. If someone vulnerable is living in the house while you sell, it's worth tackling the cause now rather than later.

Do you have to tell buyers about damp?

Your solicitor will ask you to complete the Law Society's TA6 property information form. Since 30 March 2026, firms in the Law Society's Conveyancing Quality Scheme have had to use the 6th edition for new sales. It asks, among other things, about:

• warranties for work done, including damp-proofing and timber treatment
• whether the property has flooded
• insurance claims and any difficulty getting insurance

After the buyer's survey, their solicitor will often send further questions about anything it flagged, and damp is one of the most common.

Your answers must be honest and as complete as you can make them. If you genuinely don't know something, "not known" is a proper answer. Under the Misrepresentation Act 1967, a buyer who relied on a false answer may be able to claim compensation from you, and in serious cases a court can set the sale aside. Painting over damp to hide a problem you know about is a bad idea: if it comes out, it's strong evidence that you misled the buyer.

Our guide to the TA6 property information form explains each section in more detail.

How buyers and lenders see damp

Most buyers expect some condensation in an older home. What worries them is damp they can't explain, because it might mean rot in floor timbers, a failing roof or a bigger repair bill.

When a buyer needs a mortgage, the lender's valuer may note damp and the lender may then:

• ask for a specialist damp and timber report
• hold back part of the loan until the work is done (a "retention")
• lower the valuation to reflect the cost of repairs

None of this usually kills a sale on its own, but it adds weeks and gives the buyer a reason to renegotiate. Having a clear diagnosis and a quote ready can stop that happening late in the sale, when it's most stressful.

Fix it or sell as it is?

Situation	Usually worth fixing first?
Condensation and mould	Often yes. Clean the mould, improve ventilation and heating, and fix extractor fans.
Penetrating damp from gutters, downpipes or a small roof leak	Often yes, as long as the repair is straightforward. Let the wall dry out before redecorating.
Rising damp confirmed by testing	Get quotes, then compare the cost with what buyers are likely to knock off.
Damp with rot, structural damage or an unknown cause	Often better to sell as it is, with the facts and any quotes disclosed.

Two things to avoid. First, don't redecorate over damp just before viewings: a buyer's surveyor will check for damp, and fresh paint on a damp wall raises suspicion. Second, don't pay for expensive treatments before the cause is clear.

If you already have damp-proofing paperwork

If damp-proofing or timber treatment was done in the past, find the paperwork. Some treatments came with a warranty that may pass to a new owner, so check its terms and whether the company needs to be told about the sale. Your solicitor will ask for it when you fill in the TA6, and a buyer's lender may want to see it too.

Your options for selling

Route	Price	Speed	Good for
Estate agent	Usually the highest, if buyers and their lenders are comfortable	Often several months	Minor damp with a known cause, or damp you've fixed
Auction	Can work well for homes needing major work, but there are fees and no certain price	Weeks once listed	Serious damp, rot or unknown causes
Cash buying company	Usually below market value	Can complete in weeks	Owners who want a certain, quick sale without repairs

When an estate agent is likely to be better: if the damp is minor, the cause is known, and you can fix it or show buyers a sensible quote, the open market usually gets you the most money.

When a quick sale can make sense: if the damp is widespread, the cause is unclear, you can't fund the work, or a sale has already fallen through after a survey. You'll usually accept less for speed and certainty, so it doesn't suit someone whose priority is the highest price.

If you'd like a comparison, we buy homes as they are, including those with damp, and make an offer within 24 hours. We pay your legal fees, and there's no obligation to accept. Our offer is below market value, and we'll explain how we worked it out. You can read more about below market value offers first.

A checklist for selling a house with damp

• The type and cause of the damp identified, ideally by an independent surveyor
• Quotes for the work, so buyers aren't left guessing
• Simple fixes done: gutters cleared, extractor fans working, mould cleaned
• Any damp-proofing or timber treatment warranties found and handed to your solicitor
• TA6 answered honestly, with "not known" only where you genuinely don't know
• An Energy Performance Certificate ordered before you market the house (it lasts 10 years)
• A realistic price, checked against sold prices for similar homes (see how to get a house valuation)

If damp is one of several problems, our guide to selling a house that needs work helps you weigh up renovating against selling as it is.