Drainage and septic tanks
Where a report pairs pitch-fibre pipe with the lawn run, what stays open about deformation a camera has not yet seen?
What stays open is the shape of the pitch-fibre pipe under the lawn, because a camera has not yet seen it. The report pairs that material with the lawn run. Pitch-fibre pipe can deform as it ages, but deformation on the hidden length has not been inspected. The survey may have recognised the material at a chamber. It has not filmed the lawn run, has not decided the pipe has collapsed, and has not decided it is still round. The pairing is a reason to look. It is not the look.
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?
Pitch-fibre drains were laid as a light pipe and can oval and blister with age. That behaviour is why the material is worth naming when it appears at a manhole. The lawn run is the buried length between chambers, which a visual survey does not see. A camera is what shows deformation, open joints or a collapse, and the question is clear that the camera has not been used yet. Recognising the pipe at one end does not describe the middle. The suspicion stays a suspicion.
Ask a drainage firm for a camera survey of the lawn run before anyone digs it up or lines it. The home survey has not done that survey and has not specified a repair. Tell the solicitor the pitch-fibre was identified and the hidden shape was not seen, so a collapse should not be stated as fact. Do not excavate the lawn on the pairing alone. If a camera later shows deformation, that is new evidence. Until then keep the material and the unsurveyed run apart.
What should you ask your surveyor?
- Where was the pitch-fibre actually seen, and where was the lawn run only inferred?
- Did the visible end look round, blistered or already deformed?
- Were both chambers at the ends of the lawn run opened?
What are the typical next steps?
- Treat deformation under the lawn as unseen.
- Ask a drainage firm to camera-survey the pitch-fibre run.
- Tell the solicitor collapse has not been established.
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 pitch-fibre pipe always collapse?
No. It can deform with age, which is why it is named, but this lawn run has not been seen by a camera. The survey paired the material with the run and did not decide the pipe has collapsed. Some lengths stay serviceable and some do not. Only the hidden bore will show which this one is.
Can the pipe be lined without a camera survey?
A liner needs a known pipe to go into. The survey has not seen the lawn run and has not specified lining or replacement. A camera survey is what would show deformation, diameter and collapses. Ask a drainage firm for that first. Do not accept a lining price based only on the material name.