Damp and moisture meters
Does a solid stone wall in an exposed place always fail a moisture-meter check?
No. Many solid stone walls hold some moisture and still do the job they were built for. A meter can read that moisture as “damp” without proving a defect. The survey should say whether rain is getting through, or whether the wall is simply an old solid wall.
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?
Thick stone and earth-mortar walls manage moisture by drying to both sides. A cement render, a waterproof coating or a modern plaster can trap that moisture. A meter on the inner face then reads high because the wall cannot dry, not because a damp-proof course is missing. Some old walls were built without a modern course at all.
RICS points Level 3 at older and unusual construction for this reason. A Level 2 can still comment, but it may not explain how that wall was meant to work. Ask the surveyor whether the reading is a defect or a feature of the construction, and what must not be coated. The Property Care Association’s advice is to understand the wall before applying a tanking product.
What should you ask your surveyor?
- Is this a solid wall, and did you see cement render or a waterproof coating on it?
- Are the high readings general across the wall or in one rain-struck patch?
- Would you have chosen a Level 3 because of this construction?
What are the typical next steps?
- Do not inject or tank a solid stone wall because a meter beeped.
- Ask what the wall is made of, and whether the finish is letting it dry.
- If you plan to insulate the inside, ask a surveyor who understands solid walls before you fix anything to them.
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
Are all stone cottages “damp” in survey language?
No. Some are wet because of failed gutters, high ground or hard cement. Some are performing as built. The report should distinguish those.
Does a lime plaster change the reading?
It can. Lime finishes allow drying and can still show moisture while they do it. That is not the same defect as rotten embedded timber.