Subsidence, settlement and heave
Concrete sleepers hold up the patio and the bottom sleeper has rotated outward. Has the survey calculated the soil behind it, or only recorded the rotation?
Only the rotation was recorded. The concrete sleepers hold up the patio, and the bottom sleeper has rotated outward, which is the movement the survey wrote down. Nobody on that visit calculated the soil behind the wall: not the pressure of the ground, not how wet it is, and not whether the sleepers were meant to hold that patio. A home survey describes the tilted course it can see. It has not decided the cause, and it has not produced a retaining-wall design.
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 sleeper wall is a stack of concrete beams used as a small retaining face. When the bottom one rotates outward, the ground and the patio above are no longer sitting on a plumb stack. The survey can photograph that lean and say which sleeper moved. It cannot, from that photograph, weigh the soil, test its strength, or say how much of the patio is loading the wall. Those are ground calculations. They were not done, and a sentence about rotation does not contain them.
Keep the rotation as a condition note and pass the bank to a retaining-wall engineer if the patio matters to the purchase. The solicitor can ask the seller whether any design or past repair of these sleepers exists, and can keep that reply separate from the survey. Do not describe the soil as checked because a sleeper looks out of line. The inspection recorded a rotation. It did not calculate the ground behind it.
What should you ask your surveyor?
- What of the bottom sleeper’s rotation did you record, and from where?
- Did you calculate the soil behind the sleepers, or only describe the lean?
- Which part of the patio loading sat outside this visual inspection?
What are the typical next steps?
- Treat the note as a recorded rotation, not a soil calculation.
- Ask the seller, through the solicitor, for any design or repair paper.
- Instruct a retaining-wall engineer if the bank must be checked.
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 hairline crack in one sleeper mean the soil has failed?
No. A hairline crack is a mark in the concrete, not a calculation of the ground behind the wall. The survey recorded the outward rotation of the bottom sleeper and did not weigh the soil or test it. A crack and a rotation can sit in the same note without either of them being a ground investigation.
If the patio slabs are level, has the sleeper stopped moving?
Level slabs do not date the rotation and do not show that movement has stopped. The survey saw the bottom sleeper turned outward on the day of the visit. It took no earlier reading and it did not calculate the soil. A level patio can sit above a sleeper that has already rotated, so the slabs are not a monitoring record.