Damp and moisture meters
Mould is on the external wall behind a wardrobe and the rest of the room is clean. Why is that a cold-surface and furniture note?
Because the mould is on a cold external wall that the wardrobe has covered, while the rest of the room is clean. Air does not wash the wall behind a large piece of furniture, so that surface stays colder and can grow mould from ordinary room moisture. The open parts of the room, which are warmer and aired, can stay unmarked. The survey has recorded mould in that hidden spot and a clean room elsewhere. It has not diagnosed rising damp, a leak, or a defect in the wall construction. The note is the cold face and the furniture that blanked it.
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?
External walls lose heat. Where a wardrobe stands tight against one, the plaster behind it stays colder, and moisture in the air can condense there. Mould follows that damp surface. A clean rest of the room fits a local cold spot rather than water through the whole room. The survey recorded the mould behind the furniture. It did not trace a pipe or a gutter into that patch.
Tell the solicitor the mould is behind the wardrobe on an external wall and that the rest of the room was clean. Moving the furniture off the wall, and airing the room, is ordinary management of a cold surface. It is not a damp-proofing contract the survey has specified. If the mark returns once the wall can breathe, ask a damp specialist to look, as a new instruction. Do not read this as rising damp because one covered patch is marked.
What should you ask your surveyor?
- Was the mould limited to the external wall behind the wardrobe?
- Was the rest of that room clean on the day of the visit?
- Have you diagnosed a leak or rising damp, or a cold surface behind furniture?
What are the typical next steps?
- Read the mould as a cold face blanked by the wardrobe.
- Do not extend it into rising damp for the whole room.
- If it persists once the wall is clear, ask for a separate look.
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 is removed and the mould is wiped, has the cause gone?
Not proved. Wiping removes the growth you can see. The cold external wall and the habit of standing furniture against it can bring mould back. The survey has not specified a damp treatment and has not said the wall is defective in its construction. The note remains a cold-surface and furniture note.
Should the whole room be tanked because of this patch?
No. The rest of the room is clean, and the survey has not specified tanking or any other damp-proofing. The mould sits where the wardrobe covered an external wall. A local cold spot is not a specification for treating every wall in the room.