Subsidence, settlement and heave
A crack leaves the retaining wall and continues into the house plinth. What has that continuous crack not yet proved about which element moved first?
The continuous crack has not proved which element moved first. It leaves the retaining wall and continues into the house plinth, so the survey can record one crack crossing from wall to plinth. Continuity shows the two are linked at the surface. It does not show whether the retaining wall moved and tore into the plinth, whether the house moved and the crack ran outward, or whether both responded to the same ground. Sequence was not established. The inspection has not named a first movement.
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 crack that does not stop at the joint is more informative than a crack that stays in one material, but only about connection. The plaster or masonry line is shared. The order of events is not written in that line. The survey did not have dated readings, did not open the junction, and did not level the wall against the plinth. Association of British Insurers material on subsidence is about the building’s support.
Ask a structural engineer to look at the junction as a linked crack whose cause is still open, and ask the solicitor to keep any past insurance paper separate until that cause is clearer. Do not let a seller’s guess about which part moved become the survey’s finding. The inspection recorded continuity. It did not decide whether the retaining wall or the house plinth moved first.
What should you ask your surveyor?
- Did the crack run unbroken from the retaining wall into the plinth?
- What evidence of sequence, if any, was actually available?
- Were levels or dated readings taken, or was this a single visit?
What are the typical next steps?
- Treat the crack as continuous, not as proof of which part moved first.
- Ask an engineer to investigate the junction before you name a cause.
- Keep any insurance story separate until it matches the crack.
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 the retaining wall leans and the plinth does not, did the wall move first?
A lean in the wall and a plumb plinth would be a clue, not a proof of sequence, and the survey has not established even that contrast as the cause. The finding is a crack that continues from one into the other. Which element moved first remains unproved. One visit cannot order the movements.
Does the crack’s width at the plinth show the house is the problem?
Width shows where the crack is open on the day. It does not show which element moved first, and the survey did not measure a history of that width. A wider gap at the plinth can be the way the crack finished, not a verdict on the house. Sequence is still unsettled.