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Building over or near to a public sewer

sewer manhole

During the building of any development you'll need to make sure that there are no public sewers located in the area of planned works.

Before making an application to build over or near to a sewer:

  1. Establish if there is a public sewer in the vicinity of your proposed works.
  2. Find out why we need to know that you are planning a build over, or near to a sewer.
  3. Find out about our build over/near to requirements.
  4. Assess your proposals against our standard criteria.

You will need to make an application if you do not comply with our standard criteria. Please note that diverting the sewer should be considered where feasible. It is unlikely that we will permit you to build over a strategic public sewer.

Under no circumstances will we permit building over a sewer or lateral drain where:

  • The sewer is a pressurised, i.e. a pumping/rising main.
  • A manhole/chamber will be inside a building.
  • An entirely new dwelling/building is proposed.

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To apply for a build over consultation or agreement, please log in to our portal InFlow

Apply here

You will find our handy user guide for drainage services here

You can also access InFlow by copying this link and pasting into your browser:

If you experience any technical problems with InFlow, or you require more information, please get in touch by email: or call us on 0345 60 66 087, option 3.

Need help with your application or want further information?


Call: 0345 60 66 087, Option 3  (8.30am to 4.30pm Monday to Thursday; 8.30am to 4.00pm Friday)



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Registered in England No. 2366656. Registered Office: Lancaster House, Lancaster Way, Ermine Business Park, Huntingdon, Cambridgeshire. PE29 6XU