Water Supply Industry Interpretations and Advice

  • Area of Interest : Installation
  • Topic : Stop valves
  • Title : Provision and location of common or separate supply stop valves in buildings
  • Clause Reference : Schedule 2 paragraph 11: G10.3 & G10.4
  • Reference Number : I12
  • Decision Date : June 2002

A stop valve is required either inside or immediately outside the premises on the supply pipe to comply with the Guidance Clauses G10.3 and G10.4 and Diagram G10.4a.

The addition of an external stop valve on the supply pipe to the premises, fitted at the boundary of the property, should be considered good practice, but not mandatory.