Damp proofing questions, answered

It depends on the job, but as a general guide, Checkatrade's own data puts the Ammanford average at £1,400, with most jobs between £962 and £2,076. A simple single-room job costs less; a full ground-floor treatment with replastering costs more. See our cost guide for a full breakdown by job type.

No. Damp doesn't stop you selling a property, but you do need to disclose it on the TA6 property information form if you're aware of it. It's also one of the more common things a mortgage valuation or homebuyer's survey picks up, so it's worth getting a proper diagnosis, and ideally a plan to fix it, before a buyer's own survey finds it first.

There's no dedicated UK-wide grant that covers damp proofing specifically. Some wider home-improvement or energy-efficiency schemes occasionally fund related work, like insulation or ventilation upgrades, but eligibility rules change regularly. Check gov.uk or your local council directly rather than relying on older information, since schemes get added and withdrawn often.

For mild condensation, yes: better ventilation, an extractor fan, and not drying washing on radiators genuinely help. Rising and penetrating damp are different. Both need a proper diagnosis first, since treating the wrong type of damp is one of the most common reasons DIY fixes don't last, and a damp-proof course needs specialist equipment to install correctly.

Yes, provided the underlying cause is actually dealt with. A correctly installed damp-proof course, along with replastering where the wall has absorbed salts, should stop rising damp coming back. When it does return, it's almost always because the original diagnosis was wrong, for example treating rising damp when the real cause was penetrating damp from a specific outside defect.

There are DIY damp-proofing creams, injection kits and damp-proof paints sold for home use. They can help with minor condensation, but they don't fix rising or penetrating damp at the source, because the actual cause, a failed damp-proof course or water getting in from outside, is still there underneath. Treating the symptom rather than the cause is the most common reason damp comes back after a DIY attempt.

Occasionally, if it's caught very early and the plaster hasn't absorbed much in the way of salts. In most established cases, the plaster near the base of the affected wall has to be removed and replaced, because the salts drawn up with the moisture stay behind in the old plaster even once a new damp-proof course is in and the wall has dried out.

It depends which type. Condensation responds quickly to more ventilation, an extractor fan, or a dehumidifier. Rising and penetrating damp don't have a fast fix: a damp-proof course needs to be injected and the wall then needs weeks to dry out before you'd see much visible improvement. Be cautious of anyone promising an overnight fix for rising damp specifically.

A musty smell that doesn't clear with airing, black mould on walls or ceilings, wallpaper peeling or plaster crumbling, paint flaking or bubbling, and damp patches or tide marks on internal walls. Which signs you see can be a useful clue to the type: a tide mark low on the wall points toward rising damp, while a patch that only appears after heavy rain is more likely penetrating damp.