Air conditioning for extensions and kitchen-diners in Chiswick
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. An extension in Chiswick with a roof lantern or large glazed doors can overheat quickly on a sunny afternoon.
In Chiswick, a side wall of a single-storey extension is usually the neatest place for the indoor unit. We cover Chiswick as part of London, roughly 6 miles from central London. We cover W4 and the streets around them.
Prices in Chiswick
For Chiswick, expect roughly £1,895 to £5,845 per space, VAT included, adjusted for typical London rates. That is above the UK middle, mainly because labour and access cost more in London. What moves a quote in Chiswick up or down is mostly pipe length, how high the outdoor unit goes, and whether a new electrical circuit is needed. For reference, the Large single option in Chiswick (one 5–7 kW unit for a large glazed space) usually comes to 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
For most houses in Chiswick, the outdoor unit is permitted development if it passes the MCS 020(a) noise check (37 dB(A) or less at the nearest neighbouring window) and stays within the size and number limits. We run that check on survey.
The survey
A survey in Chiswick 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. 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.
What is included
Here is what is included on every job in Chiswick:
- Placement clear of the hob and oven
- Pressure test, vacuum and commissioning
- Handover of the remote or app
- Free survey with glazing and roof heat-gain check
- Hidden routes during the build, or neat surface routes after
Nearby
Close to Chiswick, our coverage also includes Acton (1 mile), Barnes (1 mile) and Shepherds Bush (2 miles). See all services in Chiswick or air conditioning for extensions and kitchen-diners across London.