Timber decay and woodworm
A growth in the cellar might be dry rot and it was not sampled. Why is a photograph not an identification?
A photograph is not an identification because it only records appearance. The cellar growth might be dry rot and it was not sampled, so the survey has not named the fungus. Other growths can look similar in a picture. The photo is a visual note. It is not a laboratory result. The survey has not identified the growth with certainty and has not mapped any spread from it. Doubt remains the finding.
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?
Naming a fungus needs the growth itself, not a flat image in poor cellar light. A photograph cannot be turned, cannot show strands behind a skirting, and cannot separate lookalikes. The report already says the growth might be dry rot, which is doubt rather than a concluded name. Sampling was the step that would narrow that doubt, and it was not done. The picture keeps the appearance. It does not finish the diagnosis.
Tell the solicitor there is an unsampled growth that might be dry rot, not a confirmed outbreak. A timber specialist can sample it and can say whether nearby timber is affected. The survey has not done that and has not condemned the cellar wood from the photograph. Do not tell a lender that dry rot has been identified. If you want the fungus named, a sample still has to be taken.
What should you ask your surveyor?
- Where in the cellar is the growth, and what timber is nearest?
- Were strands seen leaving it, or only the body in the photo?
- What would a specialist need before naming the fungus?
What are the typical next steps?
- Describe the growth as unsampled and not identified.
- Ask a timber specialist to sample it before anyone names dry rot.
- Do not tell the lender the cellar has confirmed dry rot.
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
Has the photograph condemned the cellar timber?
No. The photograph does not identify the growth, and the survey has not condemned the joists or boards from it. Nearby timber was not shown to be decayed by an unsampled fungus. A specialist sample would name the growth and, separately, test the wood. The picture is a record of how the growth looked, nothing more.
Can the photograph map spread through the masonry?
No. A picture of a surface growth cannot map a path through masonry. The survey did not trace strands and did not sample the growth, so spread beyond the frame is unproved. This visit has not demonstrated travel through the wall. The identification itself is still open, and the photo does not close it.