Air conditioning for extensions and kitchen-diners in Windsor
Summers in the South East are among the warmest in the country, so cooling often comes first, with efficient winter heating as a bonus. An extension in Windsor with a roof lantern or large glazed doors can overheat quickly on a sunny afternoon.
In Windsor, a side wall of a single-storey extension is usually the neatest place for the indoor unit. Windsor lies roughly 16 miles from Reading, and we cover it as part of Berkshire. That includes the SL4 postcode district.
Prices in Windsor
In South East England, our guide range for air conditioning for extensions and kitchen-diners is £1,745–£5,445 per space, including VAT. That is above the UK middle, mainly because labour and access cost more in South East England. Quotes move with the length of the pipe run, where the outdoor unit can sit and how much electrical work the job needs. As an example, the Large single option (one 5–7 kW unit for a large glazed space) would typically be £2,495–£3,495 here.
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
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 Windsor 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
Included as standard in Windsor:
- One or two units sized for the whole space
- Pressure test, vacuum and commissioning
- Hidden routes during the build, or neat surface routes after
- Placement clear of the hob and oven
- Free survey with glazing and roof heat-gain check
Nearby
If you are just outside Windsor, we also work in Slough (2 miles), Egham (4 miles) and Staines (5 miles). See all services in Windsor or air conditioning for extensions and kitchen-diners across Berkshire.