Age and type of house
A timber-frame semi has a party wall the surveyor could not see inside. What fire and sound separation was not opened up?
The fire separation and the sound separation inside the party wall were not opened up. The surveyor could see the face of the wall in this timber-frame semi, not the build-up between the two homes. Linings, cavity barriers, insulation and joints stayed covered. No fire test and no sound test was done. The survey can say the party wall was not opened. It cannot say the separation is present, complete or missing.
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?
In a timber-frame semi the party wall is a built-up element, not a simple lump of brick you can judge from one side of the paint. The performance people care about, fire and sound, depends on layers and junctions that are hidden once the boards are on. A quiet house on the day of a visit is not a sound test. A lack of scorch marks is not a fire test. The inspection records the limit. It does not invent the layers.
Ask the seller for the party-wall or frame details from the original build, and let your solicitor see what those drawings actually show. Drawings are not the opened wall. If you need the separation inspected, that is a specialist instruction with access into the construction, agreed with whoever owns the other side where that is required. The home survey has not carried out that opening and has not certified either separation.
What should you ask your surveyor?
- Did you see only the surface of the party wall?
- Were any barriers, quilt or joints visible at a hatch or a socket?
- Have you left both fire and sound separation as not tested?
What are the typical next steps?
- Record the party-wall build-up as not opened.
- Ask the solicitor for the original frame or party-wall details.
- Do not treat a quiet visit as a sound test or a fire test.
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 you cannot hear the neighbours, is the sound separation proved?
No. Not hearing a neighbour during a short visit is not a test. The layers inside the party wall were not opened, so sound separation was not inspected and not measured. The fire-separation layers inside that wall were also left unopened.
Does a brick face on the party line mean it is a brick party wall?
Not by itself. A timber-frame semi can show a masonry face while the separation that matters is a built-up wall the surveyor could not see inside. The survey has not renamed that hidden construction. The party wall still has to be named from the build-up, not the paint.