Drainage and septic tanks
The seller says the septic tank is shared with the cottage next door. What right to use it has the survey not read in a deed?
The survey has not read any deed, so it has not found a right to use the shared tank. The seller says the septic tank is shared with the cottage next door. That is their account of an arrangement. A home survey can note the tank it saw and the fact of the claim. It cannot open the title, interpret an easement, or say the cottage must keep accepting the flow. The right, if it exists, is a legal sentence in a document the inspection did not read.
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 drainage only works, in practice, if the paper matches the pipes. The surveyor may see one tank and two houses nearby. That geography is not a grant of rights, a split of emptying costs, or a duty to maintain. Septic tanks are not cesspools and not treatment plants, and the survey only records what was seen of this one. Who may connect, who pays, and what happens if the neighbour objects are questions for the solicitor and the deeds. They are not answered by standing on the cover.
Ask the solicitor to look for an express right, a deed of grant, or a mention on the titles of both cottages, and to tell you if nothing of that kind is there. Do not write to the neighbour as if the survey had confirmed the share. If the tank type or its condition also matters, keep that as a separate drainage question. The legal gap is specific: the right to use the neighbour's, or the jointly used, tank has not been read in any deed.
What should you ask your surveyor?
- Did you record the shared-tank claim as the seller's, not as a right you found?
- Which deed or title wording was actually in the papers you saw?
- Have you left the right to use the tank with the solicitor?
What are the typical next steps?
- Treat the shared-tank story as the seller's account.
- Ask the solicitor to read the deeds for a right to use it.
- Do not tell the neighbour the survey has confirmed the arrangement.
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 both houses have manholes in one garden, is the right proved?
No. Two covers in one garden show drainage furniture. They do not show a deed. The survey has still not read a right for the cottage next door, or for you, to use the tank. The deed was never in the inspection.
Does paying toward emptying create the legal right?
Not by itself. A history of sharing cost, if the seller describes one, is still not the deed. The survey has not read a right, and a payment story does not become one. Shared payments do not rewrite the title.