If you are building multiple domestic or commercial properties on a site that will have new road access you will probably need a new water main. This main, and the services to each property, can either be laid by ourselves or by accredited self-lay providers under Section 51.

We support mains laid by self-lay providers (SLP) and adopt independently installed mains and services once they are commissioned.

A national code of practice for the self-laying of water mains is now available. This sets out the requirements from the initial application and proposal through to entering into a formal agreement and completion of the work on site, with subsequent adoption by the water company.

The first step with any prospective self-lay project is confirmation that the SLP / contractor has the appropriate level of competence to carry out the work.

The Water Industry Registration Scheme (WIRS) has been put in place by the water industry to effectively assess and monitor the performance of all SLPs and contractors, hence accreditation under this scheme is now the accepted method of assessment.

Close liaison and clear and timely communication between all parties is fundamental to successful progression and completion of the self lay process.

This scheme is operated by Lloyds Register EMEA. To see a full list of accredited SLPs and contractors, or apply for accreditation yourself, please visit the Lloyds Register website.

For more information about self-lay, please contact Martin Croutear in our Developer Services Team on 0330 303 0119 or email

As a SLP customer of ours, you deserve the highest standard from us. Most of the time we achieve this but sometimes we get it wrong.


SLF - B0 Point of connection application (Capacity check) (PDF)
SLF - B1 Self-Lay water main connection application form (PDF)
SLF - B2 Conversion from Section 41 to Section 51 form (PDF)
SLF - B3 Guidance notes for use with form SLF - B1 (PDF)
SLF - C1 Contaminated Land Assessment part 2 (PDF)
SLF - C2 Risk assessment for material (water pipes) (PDF)
SLF - D1 Acceptance form of S51 offer (PDF)
SLF - F3 Source of water application form (PDF)
SLF - F4 Notification to start constructing a new water main (PDF)
SLF - F5 Application for on-site self-lay water connections (PDF)
SLF - F6 Application for services off an existing SW main (PDF)
SLF - F7 Notification of commencement of service connections (PDF)
SLF - G7 Notification of pre-inspection for routine mains connection (PDF)
SLF - H1-Policy Appendix Two - Inline Mains Connection (PDF)
Notification of proposed works (Water Regulations consent) form

Policy documents

SL - A1 Self-Lay Policy SW Supplementary Document (PDF)
SL - A1 Policy Appendix One – Commissioning and Handover (PDF)
SL - A1 Policy Appendix One - Commissioning Advice Form 1 (PDF)
SL - A1 Policy Appendix One - Commissioning Certificate Form 2 (PDF)
SL - A1 Policy Appendix One - Work Inspection Report Form 3 (PDF)
SL - A1 Policy Appendix Three (SL-A3) - Schedule of permissible materials (PDF)
SL - A1 Policy Appendix Four - Connection Drgs (PDF)
SL - A1 Policy Appendix Five - EG of Net Asset Payment (PDF)
SL - A4 Meter location and installation guide (PDF)
SLS - A6 Levels of service for Self-Lay (PDF)
SL - E1 Agreement for mains and services (PDF)
SL - E2 Agreement for services only (PDF)
SL - F1 Pre-start meeting agenda (PDF)
SL - F2 Site guide (PDF)

Process charts

S51 Construction (PDF)
S51 Application (PDF)
S51 Mains vesting and asset payment procedure (PDF)
S51 Point of connection application (PDF)
S51 Routine inline mains connection procedure (PDF)
S51 Service Pipe Installation (PDF)
S51 SLP design (PDF)
S51 SW design (PDF)
S51 Terms acceptance (PDF)