Drainage
What do drainage defects mean in a home survey?
Approved Document H is the building-regulations document for drainage in England. RICS Level 1 does not lift inspection covers as standard. Levels 2 and 3 include a more extensive drainage-chamber inspection than Level 1. None of those surveys is a CCTV survey unless the surveyor says they carried one out.
Last reviewed 24 October 2026. Written for buyers in England and Wales unless a source says otherwise. No named surveyor has signed this page. It is general guidance, not a report on your house, and not legal advice.
What does a home survey actually do with the drains?
It depends on the level you bought. RICS Level 1 does not lift inspection chamber covers to drains or septic tanks. Levels 2 and 3 include a more extensive drainage-chamber inspection than Level 1: where covers can be lifted safely, the surveyor looks in the chamber. Level 3 can also include watching normal everyday use, where that is possible. None of those visits is a CCTV survey unless the surveyor says they did one. A chamber that is seized, paved over, or too heavy to lift should be reported as not inspected.
| Service | Drains |
|---|---|
| Level 1 | Does not lift inspection covers as standard |
| Level 2 and Level 3 | A more extensive look at drainage chambers than Level 1, still visual |
| CCTV | Not included unless the surveyor says they did one |
| Building regulations | Not a certificate that the system meets Approved Document H |
What is Approved Document H, and what is it not?
Approved Document H is the building-regulations document for drainage and waste disposal in England. It covers foul water drainage above and below ground, and the standards used when drainage work is carried out under those regulations. It is not a survey of an existing house, and it is an English document. If you are buying in Wales, do not treat it as the Welsh building regulations. Your solicitor and, where work is proposed, a building-control body are the route for whether past drainage work was signed off.
The RICS Level 3 description says the surveyor does not investigate the drainage installation or whether it meets current regulations. They also do not carry out specialist tests. A comment that a chamber was dirty, that a gully was blocked, or that the surveyor could not find a cover, is a condition note. It is not a statement that the run between chambers is intact, and it is not an approval under Approved Document H.
When might drains matter to damp or to movement?
A leaking drain can keep ground wet beside a wall, which is one way penetrating damp and timber decay get a supply of water. It is not the same mechanism as condensation, and it is not something a moisture meter on the plaster can prove. Gutters and downpipes discharge into the same system. A blocked gully at the foot of a downpipe is often the first place a surveyor can see trouble, without having seen the pipe underground.
If the report also mentions movement, or trees close to the house, read those sentences beside the drainage note. Do not upgrade them into a single cause. A home survey has not traced roots and has not surveyed the pipe with a camera. The useful step is the investigation the surveyor actually named. In England and Wales that may be a drains specialist with CCTV, agreed before exchange if the survey has said the structure may be affected. It is a different instruction from the home survey you have already had.
What should you ask if the report mentions drainage?
Ask which chambers were opened, what was in them, and what was not seen. Shared drains, a septic tank, and a cover in a neighbour’s garden are legal and practical limits as well as technical ones. Your solicitor should hear about those.
- Which covers did you lift, and which could you not open?
- What did you see in the chamber: flow, debris, a broken benching, or standing water?
- Are you recommending a CCTV survey, or only recording a visual limit?
- Is any damp or movement linked to the drains, or is that still only a possibility?
- Are the drains shared, and did you see the outfall or the treatment plant?
Common questions
Does a Level 1 survey lift drain covers?
No. RICS Level 1 does not lift inspection chamber covers to drains or septic tanks. The surveyor may still comment on gullies and covers they can see without lifting them. Underground pipes are outside that inspection.
If you booked a Level 2 or Level 3, have the drains been camera-surveyed?
Not unless the surveyor says they did a CCTV survey. Levels 2 and 3 include a more extensive look at drainage chambers than Level 1. Looking in a chamber is not the same as sending a camera down the pipe.
What if the inspection cover could not be lifted?
Then that chamber was not inspected, and the report should say so. A seized or buried cover is a limit, not a clean bill of health. If the rest of the evidence worries the surveyor, the next step is still a separate look, not a guess about the hidden pipe.
Does the survey mean the drains pass Approved Document H?
No. Approved Document H is the English building-regulations document for drainage and waste disposal. The Level 3 description says the survey does not investigate whether drainage meets current regulations. Wales is a separate building-regulations system.
The report mentions a slow gully or a smell. Is that a collapsed drain?
Not on its own. A blocked gully, a flat fall or debris in a chamber can cause a smell or slow emptying without a collapse further down the run. It is a reason to clear and look, and a reason for CCTV only if the surveyor has said the risk justifies it.
Do nearby trees mean the drains are damaged?
No. Trees can be relevant, and a surveyor may mention them beside a drainage note or a movement note. That is a prompt to investigate if the report asks for it. It is not a finding that roots have entered the pipe.
Should you renegotiate before you know what is wrong underground?
A price cut for an unseen pipe is a guess. If the survey recommends a CCTV survey or a lifted cover they could not move, get that done before exchange or decide you will accept the unknown. The home survey has already said it is not a camera inspection.
Sources
Key facts
- Approved Document H
- Approved Document H is the England document for drainage and waste disposal. A home survey does not certify that the drains meet it.
- Level 1
- RICS Level 1 does not lift inspection chamber covers to drains or septic tanks. That limit is written into the scope.
- Levels 2 and 3
- Levels 2 and 3 include a more extensive drainage-chamber inspection than Level 1. They are still a visual look, not a camera survey of the pipes.
- Not CCTV
- None of the three home survey levels is a CCTV drainage survey unless the surveyor says they did one.
- Regulations
- The Level 3 description says the survey does not investigate whether drainage meets current regulations.