Multi-split air conditioning in Westminster
Twin and triple systems suit Westminster homes where bedrooms sit above the kitchen and one rear wall can take the outdoor unit. In London, heat soaks into brick and concrete during the day and comes back out at night, which is when it is hardest to sleep.
Multi-split is a good fit for Westminster flats and maisonettes where only a balcony or one rear wall is available. We cover Westminster as part of London. Postcode districts we cover here include SW1A, SW1E, SW1H, SW1P, SW1V and SW1W.
Prices in Westminster
For Westminster, expect roughly £3,245 to £10,245 for 2–4 rooms, VAT included, adjusted for typical London rates. Prices here sit above the national middle, reflecting London labour rates and parking and access costs. What moves a quote in Westminster up or down is mostly pipe length, how high the outdoor unit goes, and whether a new electrical circuit is needed. On our London figures, the Triple option (three rooms with mixed indoor styles and Wi-Fi control throughout) is about £4,395–£7,195.
Twin
Two rooms on one outdoor unit, wall-mounted indoor units, standard routes.
Triple
Three rooms with mixed indoor styles and Wi-Fi control throughout.
Quad
Four or five rooms, longer concealed runs or a ducted unit in a loft void.
Guide prices show VAT at 20%. HMRC treats most fixed air conditioners and air-to-air heat pumps installed in homes as energy-saving materials, zero-rated until 31 March 2027 when we supply and fit them. If your installation qualifies, your quote shows 0% VAT and a lower price. Servicing, repairs, cleaning and controls are charged at 20%.
Planning and permissions
In England, most houses can have an outdoor unit under permitted development if it is no larger than 1.5 m³, meets the MCS 020(a) noise limit of 37 dB(A) at the nearest neighbour's window, and there are no more than two on a detached house or one on other houses. Listed buildings need consent.
The survey
A survey in Westminster usually takes one to two hours. We measure the rooms, check the walls and the consumer unit, agree the outdoor unit position with you and photograph the pipe routes. We book surveys in Westminster at a time that suits you, including early evenings by arrangement, and send the written quote afterwards.
What is included
What a job in Westminster covers:
- One outdoor unit sized to the combined load
- Commissioning and a walk-round of every room's controls
- An indoor unit and controls for every room
- Pressure test, vacuum and refrigerant charge calculated for the pipe lengths
- Planned pipe routes through lofts, floors or trunking
Nearby
Neighbouring places we cover include Chelsea (2 miles), Battersea (2 miles) and Brixton (3 miles). See all services in Westminster or multi-split air conditioning across London.