Yes, if your extension or proposed building work is over or within 3 metres of a public sewer or lateral drain, you’ll need to let us know.

You’ll need to check our guidance notes to ensure you meet the criteria and if so, complete the Declaration of works form online and return to us by email.

If you’re unable to meet the criteria, you can complete the Enquiry to build over/close to public drainage form.

We’ll review your application and advise you within 10 working days if we can agree (in principal). If we’re not able to agree there are further details of an alternative process (sewer diversion) within our guidance notes.

We won’t permit building over or close to a public sewer within a new development or redevelopment site.

We also won’t permit building over a sewer rising main.