Party walls and boundaries
How should a buyer separate a bulge, the party wall in the loft and a neighbour's alteration this side did not open when all three are mentioned together?
Separate the shape, the wall and the unseen work next door. A bulge in the party wall in the loft was noted from this side. A neighbour's alteration was not opened and was not inspected. The bulge may be the wall itself, a lining, or the effect of something done next door, and this visit cannot see that something. The survey recorded a distortion on this side. It has not decided the cause and it has not entered the neighbour's roof.
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?
Party walls in lofts are often bare brick or block on this side and lined or altered on the other. A bulge can be a leaning leaf, a pushed-out joint, stored load, or a chase and beam cut next door. Those mechanisms are not sorted by feel from this loft. The survey did not open the neighbour's alteration and did not measure the bulge over time. One visit's view is this side of the masonry only. Cause and the other roof stay out of reach.
Tell the solicitor there is a bulge on this side of the party loft and that the neighbour's side was not opened. Party-wall rights of access are a legal question, not a finding that the survey already exercised. A structural engineer can advise on this side. Tell a lender the cause is undecided and next door was not inspected. Do not accuse a neighbour of a specific alteration the report did not see.
What should you ask your surveyor?
- Was the bulge only recorded from this side of the loft party wall?
- Did the visit leave the neighbour's alteration unopened?
- Has the cause of the bulge been left undecided?
What are the typical next steps?
- Keep the bulge, the party wall and next door's work apart.
- Ask the solicitor about access before anyone infers an alteration.
- Do not tell a lender the neighbour's roof was inspected.
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 bulge in the loft mean the bedroom wall below has failed?
Not on this note alone. A loft bulge is at roof level. The rooms below were not diagnosed by that shape, and the neighbour's side was not opened. Look at what the report actually says about the walls underneath. Do not export one loft distortion into a whole-house structural failure the survey did not describe.
Is the bulge a party-wall notice?
No. A notice is a formal step in the party-wall process, served with the paperwork that regime requires. This survey did not serve one and did not open the neighbour's alteration. The bulge is a site observation on this side. Ask your solicitor what, if anything, should be sent. The loft note is not already a notice.