Notification: Overview

What is a material change of use?

A material change of use is defined in the water fittings regulations in England, Wales and Northern Ireland, byelaws in Scotland.

It is a change in the purpose for which a premises is used or the circumstances in which water within that premises will be used, specifically the introduction of new systems or appliances which are categorised as posing a fluid category 4 or 5 risk. 

For example:

  1. The conversation of a house into a business premises or private business to a public building. 
  2. A change of business use
  3. The installation of a new rainwater harvesting system, new high risk catering equipment or any new installation in healthcare.~


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Uncontrolled if downloaded. This is informative, non-statutory guidance and intended for general guidance purposes only; it is subject to change.

Compliance with this information should not be relied upon as guaranteeing no enforcement action will be taken by water undertakers. Water Regs UK accepts no liability for loss, indirect or consequential loss arising from or in connection with this guidance document.