Other Limited Scope Contractors

When planning a plumbing project, you may find it necessary to hire specialist approved contractors.

These approved Limited Scope Contractors include:

  • Catering Installers: Approved Catering Installers can install commercial kitchen equipment

  • Point of Use Installers: Approved Point of Use Installers can install cold water chillers or water coolers connected directly to the mains

  • Reduced Pressure Zone (RPZ) Valve Testers: For commissioning and testing RPZ backflow prevention valves.

  • Water Supply Pipe Installers: Approved to work on the supply pipe from the external stop tap, up to the internal stop tap. Please see the separate page on Water Supply Pipe Installers for more detail.

These contractors are not approved WaterSafe plumbers, but are recognised by the water company schemes: APLUS, TAPS, WaterMark and WIAPS to work in these areas.

They will ensure all their work complies with the Water Fittings Regulations and Byelaws.

Catering installers

Approved catering installers have passed an assessment certifying their ability to install commercial catering equipment, such as vegetable cleaners and dishwashers.

Point of Use Installers

These contractors are certified to install cold water chillers or water coolers connected directly to the mains, in compliance with the Water Fittings Regulations and Byelaws.

Reduced Pressure Zone Testers

Reduced Pressure Zone Testers are trained and authorised to test Reduced Pressure Zone valves, otherwise known as RPZ valves or Type BA backflow protection devices.

These devices stop water flowing in the wrong direction.

By law, these devices must be tested at least once a year to ensure they are working properly to protect the water supply.

The installation, commissioning, and testing of RPZ valves should only be carried out by accredited and approved testers, in accordance with the Water Suppliers’ Approved Installation Method AIM-08-01.

Water Supply Pipe Installer

Please see the separate page on Water Supply Pipe Installers for more detail.





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WaterSafe Approved Contractors' Scheme Operators

Anglian WaterAssociation of Plumbing & Heating ContractorsCIPHESevern TrentSNIPEFThames WaterWIAPS