Do I Need a Drain Survey for an Extension?

Can You Build Extensions Over Drains?

When you're planning an extension, one of the key considerations is whether it can be built over drains. Building on or over existing drains can result in issues with the existing drainage infrastructure, and can create a hazard for your property. The answer to this question will depend on your local authority's guidelines, as each one will have their own specific regulations. Generally speaking, however, you won't need special permission if the work is done properly and won't damage the drain. However, it is important to remember that safety should be your primary concern, and any guidelines should be strictly adhered to.

Does a Building Survey Cover Drains?

A building survey will normally cover essential aspects of the house, such as structural integrity, but a building surveyor won't normally check the drainage system. This is because they don't look inside the manhole chamber or examine the entire length of the pipework. A full CCTV drain survey should be conducted to ensure the drains remain operational and undamaged when constructing an extension. The surveyor will be able to identify any points of potential damage, or signs of root infiltration, which may affect the integrity of the drains. It is important to note that a pre-purchase home buyers survey will not include a detailed inspection of the drainage system.

Do Surveyors Look at Drains?

Surveyors will not look at drains at all when conducting a building survey. To make sure that the drains won't be damaged by any excavation work, a separate specialist drain survey should be carried out. Drain surveys involve using specialised cameras to inspect the shape of the pipework, as well as clear blockages and identify any points of potential risk. A survey like this will also check for areas with poor levels of insulation, or places where the pipe is too small or has been mislaid. If any problems are identified, the surveyor will inform you of the necessary repairs or modifications.

Do You Need Planning Permission for Drainage?

The answer will depend on the type of work you are carrying out. Generally speaking, planning permission is not required for most domestic draining works, such as repairs or replacements. However, if your work involves laying new drains or redirecting existing ones, then planning permission is likely to be required. It is important to consult with your local authority to establish the specific requirements in your area. Additionally, it may be necessary to obtain consent from the relevant water authority if you are installing a new drain or altering an existing one.

Who Surveys the Drains?

When it comes to surveying the drains, it is important to employ the services of a specialist. It is recommended to use the services of a certified drainage engineer who will carry out a CCTV drain survey to ensure that the system is suitable for the work being undertaken. A good engineer will have the right equipment and knowledge to identify any potential risks and make sure that the necessary repair or modifications are carried out. Ultimately, this will help to reduce the risk of any future drainage issues and save you time and money in the long run.