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Self-lay of water mains and services

Self lay a water main

We understand that some Developers prefer to use a Self-lay provider (SLP) to install self lay mains and/or service connections. 

If you choose to go down the self-lay route, there are 3 options:

  • Self-lay mains.
  • Self-lay services only.
  • Self-lay mains and services.

The scheme is administered by Lloyds Register so that you can safely choose a SLP.

The work must be completed by a SLP which is accredited by the Water Industry Registration Scheme (WIRS).

For more information on Self-lay, contact the water mains team on 0345 60 66 087 (Option 2, then option 2)

If you are a non household customer or applying for a temporary building supply, at the point of connection you will need to have selected a retailer.

To read more and for guidance on selecting a retailer go to

We are fully prepared to assist Developers when using SLP’s as an alternative to us constructing new mains.

Please refer to the Water UK Self-lay 'Code of Practice' here.


InFlow logo

To apply to self-lay mains and/or services, please log in to InFlow

Apply here

You will find our handy user guide for water 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 2.

Further information

Need help with your application or want further information?


Call: 0345 60 66 087 and choose option 2  (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