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