Subsidence, settlement and heave
The gable bows and the front wall the surveyor checked is plumb. Why should the bow not be copied onto the front foundations?
The bow should not be copied onto the front foundations because the front wall the surveyor checked is plumb. The gable is the wall that bows. The front is a different elevation, and it was checked as upright. Transferring the gable's bow onto those foundations invents a movement the inspection did not find. The survey has recorded a bowing gable and a plumb front. It has not decided that one mechanism explains both, and it has not said the front foundations have moved. A defect stays on the wall where it was seen.
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?
Gables bow for reasons that need not touch the front wall. Roof thrust or a lack of restraint can push the gable out of line while the front remains upright. Foundations, if they were the cause, would more often show in the wall that stands on them. Here the surveyor checked the front and found it plumb. That check is evidence about the front. It is not a blank page on which the gable's bow can be redrawn.
Describe the gable bow to the solicitor as a gable bow, and the front as plumb where it was checked. If a specialist looks at movement, ask them to start from those two findings rather than from a single storey you have merged. Do not tell an insurer the front foundations have subsided because the gable is out of line. The survey has not made that link. Any monitoring or opening up would be a further instruction, aimed at the wall that actually bows.
What should you ask your surveyor?
- Which wall bows, and which wall did you check as plumb?
- Have you linked the gable bow to movement in the front foundations?
- What cause, if any, have you left undecided?
What are the typical next steps?
- Keep the bow on the gable and the plumb check on the front.
- Do not tell an insurer the front foundations have moved.
- If a specialist is asked, give them the two findings separately.
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
Could the front still be moving below ground while it looks plumb?
The survey has not said that. The front wall that was checked is plumb, and the bow that was seen is the gable. Guessing at hidden foundation movement under a plumb wall copies the bow onto a place the inspection did not put it. The cause of the gable bow remains undecided.
Should both walls be monitored because one bows?
Not on the survey's instruction. The note distinguishes a bowing gable from a plumb front. Monitoring, if someone advises it, is a separate decision about the wall that is out of line. The report has not asked for the front foundations to be watched as if they shared the bow.