Drainage and septic tanks
Fine roots hang at the invert of the chamber. Does that sighting prove a collapse further along the pipe?
The fine roots hanging at the invert do not prove a collapse further along the pipe. They show that roots are in the chamber at the invert the surveyor could see. That is a reason to investigate how the roots are getting in. It is not a survey of the buried run, and it is not a photograph of a broken pipe you have not seen. A camera would be a further instruction, not something this visit included unless it was agreed.
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?
Roots follow moisture and joints. At a chamber they can hang into the flow without the barrel further downstream having collapsed. They can also mark a joint that is open. The sighting itself does not choose. The survey should describe the roots and where they were, and stop before a collapse account that the chamber did not show.
Do not jet, dig or relay on the word collapse when the evidence is fine roots at the invert. If the run needs to be seen, agree a camera and say which length. Silt, a displaced collar or a soft pitch-fibre end would be separate notes. None of them is created by this sighting, and the survey does not grant a consent to discharge.
What should you ask your surveyor?
- Were the roots only at the invert of the chamber, or did they enter from a pipe you could see?
- Could you see a broken joint, or only the roots hanging in the flow?
- Are you stopping short of calling this a collapse?
What are the typical next steps?
- Record roots at the invert as roots, not as a proved collapse.
- Do not dig up the run on this sighting alone.
- If the buried pipe must be seen, agree a camera as a further instruction.
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
Do fine roots mean a tree has destroyed the drain?
No. They mean roots are at the invert that was visible. They do not identify a collapse or a length of broken pipe.
If the WC flushed, are the roots harmless?
A flush does not answer that. Water can pass roots on the day. The roots are still a reason to investigate, not a clearance.