Party walls and boundaries
A bathroom extends over the neighbour's passage and the ceiling under it was not seen. What support is unverified?
The support of the bathroom floor over the neighbour's passage is unverified. The room extends over that passage, and the ceiling under it was not seen, so the joists or beams that carry the floor were not inspected from below. The bathroom above can look ordinary while the bearing is hidden. The survey has not opened the ceiling and has not calculated the support. It has not decided that any particular statute applies and has not served a notice. What holds that floor up remains an open question.
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?
A floor over someone else's passage is a projection. The structure may be joists back to the main wall, a beam, or something altered when the bathroom was formed. None of that is visible from standing in the bathroom if the soffit is on the neighbour's side and was not accessed. Tiles, a sturdy feel underfoot, and modern fittings say nothing about the ends of the timbers. The survey records the arrangement it could see. The unseen soffit is a limit, not a hidden pass.
Tell the solicitor the underside was not inspected, and ask how access to the passage might be obtained if the support has to be seen. Party-wall rules are a separate process the survey has not started. Do not tell a lender the projection was proved. If an engineer is needed, that is a new instruction after the soffit can be seen, or with an explicit limit if it cannot. The bathroom suite is not the structure.
What should you ask your surveyor?
- Was the ceiling under the bathroom left unseen?
- Has the support of that floor been calculated?
- Did the survey serve a notice about the projection?
What are the typical next steps?
- Treat the support over the passage as unverified.
- Tell the solicitor the soffit was not inspected.
- Do not describe the bathroom fittings as the structure.
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 a new bathroom suite mean the floor was strengthened?
No. New fittings show a refit of the room. They do not show a new beam or a checked bearing, and the ceiling under the floor was not seen. The survey has not found papers for structural work. Ask the solicitor whether any approval exists. A fresh suite can sit on an old, unseen support.
What if the neighbour refuses access to the passage?
Then the soffit stays unseen, and the survey's limit remains true. Refusal does not turn the hidden structure into a pass, and it does not let the surveyor invent the joists. Tell the solicitor. Any later right of access is a legal question. The report has not created one, and the support stays unverified.