Damp and moisture meters
Is a wet concrete ground floor the same finding as rising damp in the walls?
No. A solid floor can be damp because the slab has no effective barrier, because a screed is bridging, or because a leak is under it. Rising damp is a wall term. A home survey can note a damp floor finish, blown tiles or a high reading. It does not prove which barrier is missing, and it does not test the slab.
Last reviewed 24 October 2026. Written for buyers in England and Wales unless this answer says otherwise. No named surveyor has signed this page. It is general guidance, not a report on your house, and not legal advice.
What is the fuller explanation?
The two defects are often next to each other in an older house, which is why reports blur them. A damp skirting can be the wall, the floor, or both. The Property Care Association’s approach is to separate the paths of water. Government guidance does not say a damp solid floor is cured by injecting the walls. A visual survey cannot see the membrane under the concrete.
Lifting the floor is not part of the home survey. If the rating depends on the floor, ask what was visible at the edges and at any air bricks. A quote to tank a whole ground floor is a specialist design, not a sentence you can price from the survey alone. No figure is stated here.
What should you ask your surveyor?
- Is the damp comment about the floor, the walls, or both?
- Could you see the edge of the slab, or only the finish?
- Are you recommending investigation of the floor rather than a wall injection?
What are the typical next steps?
- Do not accept a wall-injection quote as the repair for a wet slab.
- Ask what finishes would have to come up before anyone can see the slab.
- Keep a plumbing leak on the list until it has been ruled out.
Costs vary with the building and with who you instruct. Where this page does not cite a published figure, ask the surveyor, a relevant specialist, or your solicitor for a written quote. Do not treat a forum average as the price.
Also asked about this
Does a timber floor on joists have the same problem?
No. That floor has a void. Blocked air bricks are a different comment from a solid slab.
Can vinyl hide a wet slab?
Yes. A tidy sheet is not a dry floor. The survey should say if it could not see under it.