Drainage and septic tanks
The seller said septic tank and the cover the surveyor lifted looks like a cesspit with no outlet. Why must those two words not be swapped in the legal pack?
The seller's word septic tank and the cover that looks like a cesspit with no outlet must not be swapped in the legal pack. They are different descriptions. What the surveyor lifted looked like a holding tank with no outlet, which is not the same as a septic tank. The visit has not proved the installation beyond that look, and it does not grant a discharge consent. Do not invent a distance from any binding rule, and do not let one word overwrite the other.
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 cesspit stores sewage to be taken away. A septic tank is a different arrangement and is expected to have an outlet onwards. Calling the cover a septic tank because the seller did, or calling it a cesspit in a legal answer that then gets copied back as a septic tank, is the swap to avoid. The pack should keep the surveyor's limit: it looked like a tank with no outlet.
The solicitor needs the distinction, the absence of an outlet as far as it could be seen, and a clear statement that treatment and discharge were not tested. Emptying records, if they exist, belong in that legal pack too. They are not a survey finding. Nothing in the condition comment sets a charge, a distance or a consent.
What should you ask your surveyor?
- What did you actually see when the cover was lifted: an outlet, or no outlet?
- Are you refusing to adopt the seller's words septic tank as your description?
- Did you test how the tank discharges, or only look at the cover?
What are the typical next steps?
- Keep cesspit and septic tank as different words in the legal pack.
- Do not swap in the seller's label over the cover the surveyor described.
- Do not treat the survey as a discharge consent or as a measured distance.
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 there is no outlet, is it proved to be a cesspit?
Not proved. It looked like a tank with no outlet. The legal pack should keep that limit and still must not call it a septic tank.
Can an emptying invoice decide the name?
No. An invoice is not the outlet, and it is not a survey. It does not authorise you to swap the surveyor's description for a different word.