Air conditioning for extensions and kitchen-diners in Horsham
An extension in Horsham with a roof lantern or large glazed doors can overheat quickly on a sunny afternoon. Summers in the South East are among the warmest in the country, so cooling often comes first, with efficient winter heating as a bonus.
For a kitchen-diner in Horsham, we place the indoor unit clear of the hob and plan the outdoor unit at the rear. Horsham is about 7 miles from Crawley and falls within our West Sussex coverage. That includes the RH12 postcode district.
Prices in Horsham
Air conditioning for extensions and kitchen-diners in Horsham typically comes in at £1,745–£5,445 per space including VAT, based on South East England rates. Prices here sit above the national middle, reflecting South East England labour rates and parking and access costs. The biggest variables are the pipe route, access for the outdoor unit and the state of the consumer unit, all of which the survey settles. On our South East England figures, the Large single option (one 5–7 kW unit for a large glazed space) is about £2,495–£3,495.
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
A survey in Horsham 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 Horsham at a time that suits you, including early evenings by arrangement, and send the written quote afterwards.
What is included
What a job in Horsham covers:
- Free survey with glazing and roof heat-gain check
- Handover of the remote or app
- Placement clear of the hob and oven
- Hidden routes during the build, or neat surface routes after
- Pressure test, vacuum and commissioning
Nearby
Close to Horsham, our coverage also includes Crawley (7 miles), Horley (11 miles) and Haywards Heath (11 miles). See all services in Horsham or air conditioning for extensions and kitchen-diners across West Sussex.