New water mains


If you're building multiple properties on a site that will have a new road, then you'll probably need a new water main.

Most new development sites which have a new road need a new water main, which we'll then connect to our existing network. The new main will serve the site and each property will then be connected to the new main via their own individual service pipe.

There are two ways you can get a new water main:

  • Self lay – This is where the new water main would be laid (and sometimes designed) by an accredited self-lay contractor instead of Welsh Water.
  • Requisitioning – This is where we’d design and lay the new water main ourselves.

Self-lay

You can choose to have your new water main laid (and sometimes designed) by an accredited self-lay contractor instead of us. Once your self-lay contractor has laid the pipes, we’ll check that they meet our terms and will adopt them into our network.

If you choose a self-lay contractor:

  • before any work starts, you’ll need to enter into a legal agreement with us, the landowner and the self-lay provider (SLP)
  • the SLP will also need to be Water Industry Registration Scheme (WIRS) accredited. More information on WIRS can be found here. Occasionally, we may accept companies that are not fully accredited, but we reserve the right to assess an SLP’s competency if it isn’t WIRS accredited
  • you need to keep us updated on the progress of the work

More information can be found by reading:

If you think self-lay is the best option for you, you can apply to self-lay your water mains here.

How much will it cost?

  • The charge for this service is £2000+VAT per application, which is to be paid at the time of making an application and is non-refundable. You can pay this using a valid credit or debit card.
  • Once we’ve identified how much your works will cost, we’ll then deduct the £2000+VAT application fee from your final bill, so you’ll just have to pay the difference.

Where can I find more information?

  • Water UK has a helpful code of practice which you can download here.
  • Lloyds Register has a useful search tool for Water Industry Registration Scheme (WIRS) accredited self-lay contractors.

Don’t forget

  • Even if you apply to self-lay your water mains, you will still need to apply for new water connections to each property.

Requisitioning

Requisitioning involves Welsh Water designing and laying the water main.

Our specialist engineers will be able to take you through the whole process, from designing the new water main through to construction.

If you aren’t sure how to fill out the form or have any questions, take a read of our guidance notes.

How much will it cost?

  • The charge for this service is £2000+VAT per application, which is to be paid at the time of making an application and is non-refundable. You can pay this using a valid credit or debit card.
  • Once we’ve completed the works, we’ll then deduct the £2000+VAT application fee from your final bill, so you’ll just have to pay the difference.

Don’t forget

  • Even if you are requisitioning new water mains from us, you will still need to apply for new water connections to each property.