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Self-laying new mains and services

Pre-planning enquiries

We can provide guidance on the layout or design of your project. This service is for 10 or more properties only.

View pre-planning process

About self-laying mains

You can choose to use a self-lay provider rather than Thames Water to lay mains and service connections.

View self-lay overview

Self-lay application process

It's easy to apply online once you've got all your supporting documents ready. Before you start, find out everything you need to know.

How to apply for self lay

Design and construction specifications

  1. Design and construction guide 2024-25
    .pdf | 754.9 KB

Thames Water SLP policies

  1. Annual contestability summary
    .pdf | 248.6 KB
  2. Minimum information requirements
    .pdf | 186.6 KB
  3. Redress policy
    .pdf | 215 KB

Forms

  1. Point of connection and capacity check request form
    .pdf | 438.9 KB

Additional technical documents

  1. DS-DRG-WN-02250 - Extension spindle details
    .pdf | 301 KB
  2. DS-DRG-WN-02251 - Covers 1 - 150 x 150 and 225 x 225
    .pdf | 459.3 KB
  3. DS-DRG-WN-02252 - Covers 2 - 380 x 230 x 125
    .pdf | 393.8 KB
  4. DS-DRG-WN-2253 - Covers 3 - 600 x 600 and 675 x 675
    .pdf | 417.7 KB
  5. DS-DRG-WN-02254 - Covers 4 - 600 x 450
    .pdf | 412.3 KB
  6. DS-DRG-WN-02255 - Covers 5 - 900 x 600
    .pdf | 416.8 KB
  7. DS-DRG-WN-02270-01 - Standard tee connection setups valves
    .pdf | 333.3 KB
  8. DS-DRG-WN-02270-02 - Standard washout and fire hydrant set up
    .pdf | 337.8 KB
  9. DS-DRG-WN-02275 - Large communication pipe
    .pdf | 342.7 KB
  10. DS-DRG-WN-0300 - Standard fitting legend
    .pdf | 239.2 KB