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Thames Build Over Agreement

Ensure you are prepared to start works


Building Over or Near a Sewer?

When building extensions, build-over agreements are very common. If your proposed extension or foundation work is over or within 3 metres from a public sewer or lateral drain, you must notify Thames Water. A build over agreement is a Thames Water seal of approval for the building work you intend to have done over or near a Thames Water public sewer. It ensures that the sewer has the necessary clearance from your new foundation. It's possible that you don't need a full build over the agreement. The website link provided below will help you determine if one is required. The online application is £299 and can be purchased here.



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