Drainage and septic tanks
A gulley on a shared terrace drain is blocked and the neighbour's downpipe uses the same run. Can the survey make the neighbour clear it?
No. The survey cannot make the neighbour clear the gulley. It can record that a gulley on a shared terrace drain is blocked and that the neighbour's downpipe uses the same run. That is a description of what was seen. It is not an order, a notice, or a power to compel the neighbour. The block is real as an observation. The duty to clear it is not something this report can impose.
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?
Shared terrace drains often take more than one house, and a blocked gulley can sit where a neighbour's downpipe also discharges. The surveyor can see the blockage and the shared use. They cannot, by writing it down, require the neighbour to do the work or decide the legal share of the drain. Those questions belong with the solicitor and, if needed, with whoever advises on the drainage arrangement. The home survey does not become a demand. It stays a record of a blocked gulley and a shared run.
Tell the solicitor the gulley is blocked and the neighbour's downpipe uses the same run, and ask them how shared drainage is dealt with on this terrace. Do not send the survey to the neighbour as if it were an instruction they must obey. If the gulley needs clearing, arrange that practically. Keep ownership of the run separate from the observation that it is blocked.
What should you ask your surveyor?
- Which gulley is blocked, and whose downpipe shares that run?
- Did you only record the block, or did you direct the neighbour to clear it?
- What about ownership of the run did the survey leave undecided?
What are the typical next steps?
- Tell the solicitor the gulley is blocked and the neighbour's downpipe shares the run.
- Do not send the survey to the neighbour as an order they must obey.
- Keep ownership of the shared drain separate from the fact it is blocked.
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 you clear the gulley yourself, has the survey bound the neighbour to do it?
No. Clearing the gulley yourself may move the water, and it may be sensible, but it does not mean the survey has bound the neighbour to do it or to pay for it. The report recorded a block on a shared run. It did not allocate the job. Any share of cost is outside the visual note.
Does the blocked gulley decide who owns the shared run?
No. A blocked gulley does not decide who owns the shared run. It decides that the gulley was blocked when it was seen, and that the neighbour's downpipe uses the same run. Ownership and responsibility are solicitor questions. The survey has not answered them by describing the blockage.