Wall-mounted air conditioning in Westminster
A single wall-mounted unit is often all a bedroom or sunny living room in Westminster needs. 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.
Where a home in Westminster faces the street, the outdoor unit usually goes at the rear, out of sight. Westminster sits within our London area. Coverage includes SW1A, SW1E, SW1H, SW1P, SW1V and SW1W.
Prices in Westminster
For Westminster, expect roughly £1,495 to £3,895 per room, 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. As an example, the Popular option (quieter mid-range unit with Wi-Fi control and better seasonal efficiency for a living room) would typically be £2,045–£2,845 here.
Essential
Reliable 2.5–3.5 kW unit for a bedroom or study, standard pipe run, basic remote.
Popular
Quieter mid-range unit with Wi-Fi control and better seasonal efficiency for a living room.
Premium
Design-led or very quiet model, larger capacity or concealed pipework through a 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
The free survey is where the real price is set: room measurements, pipe and drain routes, electrical checks and the outdoor unit position, all written into your quote. Surveys in Westminster cover heat gain, pipe routes, electrics, access and noise to the nearest neighbour, so surprises on the day are rare.
What is included
Here is what is included on every job in Westminster:
- Core-drilled wall penetration and sealed sleeve
- Nitrogen pressure test and deep vacuum before commissioning
- Insulated copper pipework, drain and interconnecting cable
- Handover of the remote, Wi-Fi app (where fitted) and filter cleaning
- Free site survey and room heat-gain check
Nearby
Neighbouring places we cover include Chelsea (2 miles), Battersea (2 miles) and Brixton (3 miles). See all services in Westminster or wall-mounted air conditioning across London.