Air conditioning for extensions and kitchen-diners across Oxfordshire
An extension in Oxford with a roof lantern or large glazed doors can overheat quickly on a sunny afternoon. In Oxford, a side wall of a single-storey extension is usually the neatest place for the indoor unit. 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 Oxfordshire
Air conditioning for extensions and kitchen-diners in Oxfordshire 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. Longer or hidden pipe runs, high-level brackets and electrical upgrades are the usual reasons a quote lands at the top of the range. 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
Since 29 May 2025, England's permitted development rules allow larger outdoor units (up to 1.5 m³) and no longer require a 1 m gap to the boundary, provided the MCS 020(a) noise check is met. Listed buildings and pitched-roof installs still need permission.
The survey
A survey in Oxfordshire 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 Oxfordshire at a time that suits you, including early evenings by arrangement, and send the written quote afterwards.
What is included
Included with air conditioning for extensions and kitchen-diners across Oxfordshire:
- Free survey with glazing and roof heat-gain check
- One or two units sized for the whole space
- Handover of the remote or app
- Pressure test, vacuum and commissioning
- Placement clear of the hob and oven
- Hidden routes during the build, or neat surface routes after
Towns in Oxfordshire
Pick your town for local details, or see every service in Oxfordshire.