Outbuildings and conservatories
The conservatory sits over the line of the foul drain and the cover is now inside a cupboard. What cannot be rodded easily?
The foul drain under the conservatory cannot be rodded easily from that cover. The conservatory sits over the line, and the cover is now inside a cupboard, so the chamber is boxed in by joinery and by the building above the pipe. Rodding needs a clear, reachable opening in line with the run. This one is obstructed. The survey did not rod the drain and did not camera it. It records an impractical access, not a clear pipe.
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?
A foul drain relies on chambers you can open to clear blockages. Moving a cover into a cupboard, then building a conservatory over the line, leaves the old rodding point stranded. You may not get rods down the length, and you may not even lift the cover without stripping the cupboard. Another chamber might exist off the line, but this visit did not establish one as a workable eye for the length under the conservatory. The unseen run stays untested.
Ask the solicitor whether any build-over agreement exists for the conservatory on the foul drain, and whether another rodding point is documented. A drainage firm can advise on access once the cupboard is dealt with. The home survey has not created that agreement and has not tested the pipe. Do not describe the drain as clear because the rest of the house was used on the day. Easy rodding from this cover is what has been lost.
What should you ask your surveyor?
- Where is the cover now, relative to the cupboard and the conservatory?
- Which length of foul drain is left without easy rodding?
- Does the report say any other chamber serves that same length?
What are the typical next steps?
- Treat the covered length as not easily rodded.
- Ask whether a build-over agreement exists.
- Do not describe the foul drain as tested or clear.
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 a flowing WC prove the buried length is sound?
No. A WC that flushes shows water left the pan. It does not rod the length under the conservatory, and it does not prove that run is sound. The cover is inside a cupboard and was not a practical rodding point. The survey did not test the drain. What cannot be rodded easily remains that obstructed length.
Can the cupboard shelf be called a rodding eye?
No. A shelf or a cupboard floor over the cover is the obstruction, not a rodding eye. The cover needs to be reachable and in line with the drain. Inside the cupboard, under the conservatory, it is not an easy access. The survey has not cleared the foul drain and has not invented a better eye.