VCONST13710 | Building materials - Note 22 and Note 23: electrical and gas appliances: general
From HM Revenue & Customs · VAT Construction
Note 22 holds that electrical or gas appliances are excluded from the meaning of ‘building materials’ (VCONST13010), unless the appliance is:
designed to heat space or water (or both) or to provide ventilation, air cooling, air purification, or dust extraction (VCONST13750)
intended for use in a building designed as a number of dwellings and is a door-entry system, a waste disposal unit or a machine for compacting waste (VCONST13760)
a burglar alarm, a fire alarm, or fire safety equipment or designed solely for the purpose of enabling aid to be summoned in an emergency (VCONST13770)
or
a lift or hoist (VCONST13780).