Air conditioning for extensions and kitchen-diners in Westminster
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. For a kitchen-diner in Westminster, we place the indoor unit clear of the hob and plan the outdoor unit at the rear.
In Westminster, a side wall of a single-storey extension is usually the neatest place for the indoor unit. Westminster is part of our London coverage. Postcode districts we cover here include SW1A, SW1E, SW1H, SW1P, SW1V and SW1W.
Prices in Westminster
Air conditioning for extensions and kitchen-diners in Westminster typically comes in at £1,895–£5,845 per space including VAT, based on London rates. Prices here sit above the national middle, reflecting London labour rates and parking and access costs. Longer or hidden pipe runs, high-level brackets and electrical upgrades are the usual reasons a quote lands at the top of the range. On our London figures, the Large single option (one 5–7 kW unit for a large glazed space) is about £2,695–£3,745.
Single unit
One 3.5–5 kW unit for a medium extension.
Large single
One 5–7 kW unit for a large glazed space.
Twin units
Two indoor units on a multi-split for long or L-shaped spaces.
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
England's rules let most houses fit an outdoor unit without a planning application, as long as the size, number and MCS 020(a) noise conditions are met. Flats, listed buildings and roof-mounted units are treated differently.
The survey
Surveys in Westminster cover heat gain, pipe routes, electrics, access and noise to the nearest neighbour, so surprises on the day are rare. On a survey in Westminster the engineer looks at room size, glazing, the route for pipes and drains, the electrics and where the outdoor unit can sit quietly, then the written quote follows.
What is included
Here is what is included on every job in Westminster:
- Handover of the remote or app
- Placement clear of the hob and oven
- Free survey with glazing and roof heat-gain check
- Hidden routes during the build, or neat surface routes after
- Pressure test, vacuum and commissioning
Nearby
If you are just outside Westminster, we also work in Chelsea (2 miles), Battersea (2 miles) and Brixton (3 miles). See all services in Westminster or air conditioning for extensions and kitchen-diners across London.