Basements and cellars
This cellar runs on under next door's hall. Why is that a title question as well as a damp note?
Because a cellar that continues under next door's hall may cross the title, not only the line of a damp patch. The survey can note the vaults, the moisture and the fact that the space appears to run beyond this house. It cannot decide who owns the underground room, whether this title includes it, or what rights the neighbour has. Damp in the cellar is a condition finding. The extra length under the hall is a question of legal extent. Both should be recorded. Only the solicitor can match the cellar to the plan.
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?
Older cellars often ignore the neat lines of later titles. A bay of brick under the neighbour's hall might belong to this house, to next door, or to an arrangement the eye cannot settle. Damp and support still matter wherever the line sits, because water does not stop at a legal boundary and a wall carrying a hall is more than a stain. The survey describes the structure it could see. It does not lay the title over the vault and it does not award the space to either owner.
Give your solicitor the survey note and ask for a comparison with the title plan and any arrangements about support. Do not tell the neighbour, from the inspection alone, who must deal with the hall. The survey has not served a Party Wall Act notice and has not specified tanking as the cure for a title mismatch. A lender should hear two things: the condition that was seen, and that the legal extent of the underground part is still unresolved.
What should you ask your surveyor?
- How far does the report say the cellar appears to run, without treating that as a title line?
- Is the damp noted under this house, in the part beyond, or in both?
- Does any plan the solicitor holds even show a cellar?
What are the typical next steps?
- Pass the cellar note to your solicitor as a title question as well as a damp note.
- Do not agree who owns the vault from the way the brickwork runs.
- Keep support and party enquiries with the solicitor, separate from the damp description.
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 next door's hall looks sound, can the title question wait?
A sound hall does not decide title. A dry vault and a cracked one can each sit on either owner's land. The survey has not turned the brickwork into a boundary. Your solicitor should still match the cellar to the plan. Condition and ownership are different questions, and a quiet hall does not finish either of them.
Does damp under the neighbour's floor become their repair by default?
Not by a guess from the survey. Responsibility follows the title and any rights in the transfer. The inspection has not split the cost of the damp. It has recorded the space and the moisture. Ask the solicitor who must repair what, once the extent of the cellar is clear.