Non-standard construction
What did the visit record about the words possible mundic, about concrete-block walls, and about cores this home survey did not drill?
The visit recorded the words possible mundic, concrete-block walls, and the fact that this home survey did not drill cores. Possible mundic is a comment, not a laboratory result. The walls were seen as concrete block, which is why the comment comes up in the south west. RICS guidance on the mundic problem is for surveyors in that region. Cornwall Council describes a core test and does not provide it. A home survey does not drill cores or award Class A, B or C. The report has not turned the comment into a class.
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?
Concrete block can be made with ordinary aggregate or, in parts of the south west, with material that the mundic guidance is concerned with. The difference is not visible. The words possible mundic flag that uncertainty. They do not sample anything. Because this survey did not drill cores, there is no specimen and no class behind the sentence. The council's description of a core test is not a test the council carries out for you. The record is wording plus a wall type, with the decisive step left undone.
Tell the solicitor the phrase was possible mundic and that no cores were drilled. If a buyer or a lender wants a class, that class has to come from a core test this report does not contain. Cornwall Council describes the test and does not provide it. Do not upgrade the comment into Class A, B or C, and do not delete it as if the walls had been cleared. The survey stopped at the words and the visible block.
What should you ask your surveyor?
- Were the words possible mundic a comment rather than a test result?
- Did you see concrete-block walls without taking cores?
- Is the class still unawarded because no cores were drilled?
What are the typical next steps?
- Keep possible mundic as a comment, not a class.
- Tell the solicitor this home survey drilled no cores.
- Do not tell a lender the walls were cleared or classed.
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 concrete block in the south west always need a class in the survey?
No. The visit recorded possible mundic as words, and concrete-block walls as what was seen. It did not drill cores. RICS guidance is for surveyors in the south west, and a home survey does not itself award Class A, B or C. Not every note of block is a completed test. This one is not.
Can the comment be removed if the walls look even?
No. Even blockwork does not erase the words possible mundic, and it does not replace cores this home survey did not drill. Looks are not a class. Cornwall Council describes a core test and does not provide it. The comment stays a comment until a proper test, which is not this report, says otherwise.