Damp and moisture meters
A tide mark shows only behind a wardrobe on an outside wall. Why is that a poor match for a house-wide rising-damp diagnosis?
Because the mark is local to a cold, unventilated spot, not a pattern around the house. A tide mark only behind a wardrobe on an outside wall fits still air against a cold face, which is a condensation pattern. The survey has recorded where the mark is, and where it is not. It has not diagnosed rising damp through the house. Rising damp would be expected at the base of walls more widely, not only in the one place furniture blocks the air. Copying this mark onto every room overstates a cupboard-shaped stain.
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?
Outside walls run colder than internal ones. A wardrobe set against them stops the room air washing the plaster, so moisture in the air condenses and leaves a tide line that ends at the furniture. Take the wardrobe away in your mind and the pattern is explained. Rising damp does not know where the wardrobe stands. It would mark exposed skirtings as well. The survey saw one hidden patch. That is a poor match for a house-wide label, and a meter used only there would copy the same mistake.
Ask the surveyor to confirm the tide mark was not found on the exposed walls. Tell the solicitor the note is local, behind one wardrobe, so it should not be written up as rising damp in the building. Do not accept an injection quote priced for every wall on the back of this patch. If the mark matters, move the furniture, ventilate that corner, and see whether the pattern matches the cold outside wall the survey described.
What should you ask your surveyor?
- Was the tide mark limited to the plaster behind that wardrobe?
- Did exposed skirtings on the same wall stay clear?
- Have you avoided calling this house-wide rising damp?
What are the typical next steps?
- Keep the tide mark as a local patch behind the wardrobe.
- Do not stretch it into a house-wide rising-damp diagnosis.
- Compare it with the exposed walls before anyone specifies treatment.
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
If the wardrobe wall is an outside wall, must it be injected?
No. Being an outside wall explains why that face is cold, which fits condensation behind furniture. The survey has not specified injection, and a local tide mark is a poor match for rising damp that would need that kind of claim.
Does a clear chimney breast elsewhere rule condensation in?
It supports the local reading. A dry breast means the mark did not travel the house. Condensation behind one wardrobe can still be real on a cold wall without every other surface showing the same tide. The report leaves the wardrobe tide mark where it is, without a second finding.