Air conditioning for extensions and kitchen-diners across Hampshire
In Southampton, a side wall of a single-storey extension is usually the neatest place for the indoor unit. An extension in Southampton 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.
Prices in Hampshire
Our South East England guide price for air conditioning for extensions and kitchen-diners is £1,745–£5,445 per space, VAT included. Prices here sit above the national middle, reflecting South East England labour rates and parking and access costs. What moves a quote in Hampshire 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 Hampshire (one 5–7 kW unit for a large glazed space) usually comes to 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
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
We book surveys in Hampshire at a time that suits you, including early evenings by arrangement, and send the written quote afterwards. 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 with air conditioning for extensions and kitchen-diners across Hampshire:
- Free survey with glazing and roof heat-gain check
- Handover of the remote or app
- Hidden routes during the build, or neat surface routes after
- Pressure test, vacuum and commissioning
- Placement clear of the hob and oven
- One or two units sized for the whole space
Towns in Hampshire
Pick your town for local details, or see every service in Hampshire.