Timber decay and woodworm
The report mentions a sole plate next to the sleeper wall. Has wet rot the floorboards cover been tested, or only named?
Wet rot that the floorboards cover has been named, not tested. The report places a sole plate next to the sleeper wall, the usual damp junction at the bottom of a timber ground floor, but the boards were not lifted over that rot. A home survey cannot say how far the timber has softened while the boards still hide it. The sole plate and the sleeper wall were identified as far as they could be seen. The covered rot was not probed, and it has not been shown to be either slight or extensive.
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?
The sole plate is the horizontal timber at the foot of the posts, and a sleeper wall is the low masonry that carries joists clear of the ground. Moisture collects where they meet. Wet rot is fungal decay in timber that stays damp. If the boards still cover the spot, the surveyor may see a stained edge or the face of the plate at a hatch, and still not see the rot the sentence is about. Naming the risk is not a measurement of lost section.
Tell the solicitor the rot under the boards is untested, so a price for a new sole plate would be a guess this report does not support. A timber specialist can lift an agreed board and probe the plate beside the sleeper wall. Until then the survey has not decided that the plate has failed, and it has not decided that the floor is clear. A dry room above is not a test of the timber the boards are hiding. Get the covered length inspected before anyone specifies a repair.
What should you ask your surveyor?
- How much of the sole plate was actually visible beside the sleeper wall?
- Were any boards lifted, or is the wet rot entirely covered?
- Did you see fungal growth, or only a damp risk at that junction?
What are the typical next steps?
- Treat the covered wet rot as named and not measured.
- Agree a board lift with a timber specialist before a repair is specified.
- Tell the solicitor the sole plate under the floor was not probed.
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
Is a sleeper wall the same thing as the sole plate?
No. The sleeper wall is masonry carrying the joists, and the sole plate is timber at the bottom of the frame beside it. The report mentions them together because they meet at a damp junction. Seeing one does not prove rot in the other. The wet rot under the boards was named and was not tested.
Can the room smell ordinary while the plate is decayed?
Yes. The boards cover the junction, so the room can look ordinary while the plate beside the sleeper wall is damp. The survey did not lift those boards and did not test the rot it named. A dry surface is not a clear result for the hidden timber. The covered length stays unknown.