Building and Developing

How to replace an existing supply

All you need to know about replacing existing water supply or sewer connection pipework.

There are several reasons you may want to replace an existing water supply, including:

  • splitting from a shared supply
  • replacing lead pipes
  • increased demand.


You can only replace your existing water supply pipes if the property:

  • is occupied
  • has an existing, active water account
  • is not undergoing a change of use
  • is not undergoing renovation by a developer who is selling it.
Replacing water pipes

If you want to replace your water pipes, you are responsible for installing the private pipework.

You will need to lay a new 25mm pipe, leading from the home to the property boundary.

We will connect that private pipework to the same water main as the existing supply, using a 25mm pipe.

You can apply to the lead replacement scheme to arrange a replacement of existing lead pipes.

You can apply to the shared supply separation scheme if you want to leave a shared supply.  

Compulsory applications for replacement sewer connections

You must apply for a replacement sewer connection if you are:

  • making changes to our existing sewer connection
  • changing sewer flows
  • using an existing connection.

You can't connect to a public sewer without our approval.

Replacing a connection to our sewer network

Replacing a sewer connection is a six stage process.

Get in touch

Call us: 0800 707 6600