Damp and moisture meters
Render is cracked at one window corner and sound on the rest of the wall. Why should the whole elevation not be written up from that corner?
The whole elevation should not be written up from that corner because the rest of the wall was sound. The crack sits at one window corner, a point where render often splits as the opening moves a little. The survey has recorded that local crack and a wall that is otherwise sound. It has not decided that the elevation has failed, and it has not specified re-rendering the whole face from one corner. A crack at an opening is not a map of the wall. The survey has also not decided that the crack is harmless.
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?
Window openings concentrate small movements, and a hard render coat cracks at the corner rather than stretching with them. One crack there can sit in a coat that is still attached and uncracked on the rest of the elevation the survey looked at. Writing the whole wall from that corner would pretend the sound render was the same defect. It is not what was seen. The survey has not hacked the coat off, has not tested the backing, and has not traced damp from the crack to the inner face.
Ask the solicitor to note a crack at one window corner, not a failed elevation. If someone proposes to render the whole wall, that proposal is theirs, not this report. A damp specialist can be asked, separately, whether this corner is letting water in. The survey has not made the crack a whole-wall finding. Keep any later quote tied to the corner that is actually cracked, and to the sound render that was not.
What should you ask your surveyor?
- Was the crack confined to one window corner?
- Did the rest of that elevation read as sound?
- Have you avoided writing the whole wall up from that single corner?
What are the typical next steps?
- Treat the crack as local to one window corner.
- Do not re-render the elevation on this note alone.
- Ask separately whether the corner crack is admitting water.
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 crack is only a hairline, can it be ignored?
The survey has not told you to ignore it. It has said the crack is at one corner and the rest of the wall is sound. A fine crack can still be watched or filled locally. That is not a failed wall, and it is not a promise the crack will stay as it is.
Does sound render elsewhere prove the backing is dry?
No. Sound render means the coat was not cracked on the rest of the wall as seen. The survey has not tested the backing and has not proved the wall dry. It has only refused to write the whole elevation from one corner. What lies behind the sound coat was not the finding.