Subsidence, settlement and heave
What did the visit record about a diagonal crack, about a drain joint below it, and about an insurance claim this inspection is not?
It recorded a diagonal crack and a drain joint below it as things noted on site, and it recorded that this inspection is not an insurance claim. The crack is a pattern associated with movement, but pattern is not a cause. The joint was not tested. No camera survey, no water test and no monitoring were done. The survey has not decided that the drain caused subsidence, and it has not accepted, rejected or valued any claim. Those decisions sit outside the report.
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?
Diagonal cracks often run from openings as masonry shears when support is lost or when soil moves. A drain joint underneath can leak and soften the ground, or it can be a coincidence of an old joint and an unrelated crack. Telling those stories apart needs the drain investigated and the crack monitored or explained by someone instructed to do that. This visit saw the line of the crack and the position of the joint. It did not join them into a proved mechanism.
Tell the solicitor this inspection is not a claim and ask them to obtain any existing insurance correspondence, previous monitoring and drain reports. A drainage contractor can test the joint, and a structural engineer or loss adjuster works in the claim world if a claim is live. Do not ask the survey to become that claim. Tell a lender the cause is unproved: crack noted, drain not tested, no insurance decision made.
What should you ask your surveyor?
- Was the diagonal crack only recorded, not monitored?
- Was the drain joint below it left untested?
- Has this inspection stayed outside any insurance claim?
What are the typical next steps?
- Keep the crack, the untested drain and the claim as three separate things.
- Ask the solicitor for existing insurance and drain papers.
- Do not describe this survey as a subsidence claim decision.
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 diagonal crack always mean subsidence?
No. The word describes a direction. Shrinkage, lintel movement, thermal change and loss of support can all leave a diagonal line. This visit did not monitor the crack and did not test the drain below it. Subsidence has not been decided. The pattern is a reason to keep the cause open, not a finished label.
Should a lender be told a claim is already accepted?
No. This inspection is not an insurance claim and it did not see the insurer's decision. A crack and a drain joint are site notes. Ask the solicitor for the claim papers if a claim exists. Until those papers say otherwise, nobody should tell a lender that liability has been accepted or that repairs are agreed.