Air conditioning for extensions and kitchen-diners in Sevenoaks
Hot spells reach the South East early, which makes spring the easiest time to arrange an installation. In Sevenoaks, a side wall of a single-storey extension is usually the neatest place for the indoor unit.
For a kitchen-diner in Sevenoaks, we place the indoor unit clear of the hob and plan the outdoor unit at the rear. Sevenoaks lies roughly 14 miles from Maidstone, and we cover it as part of Kent. That includes the TN13 postcode district.
Prices in Sevenoaks
Air conditioning for extensions and kitchen-diners in Sevenoaks typically comes in at £1,745–£5,445 per space including VAT, based on South East England rates. South East England is one of the dearer parts of the UK for trades, which shows in the range. Quotes move with the length of the pipe run, where the outdoor unit can sit and how much electrical work the job needs. For reference, the Large single option in Sevenoaks (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
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
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. On a survey in Sevenoaks the engineer looks at room size, glazing, the route for pipes and drains, the electrics and where the outdoor unit can sit quietly, then the written quote follows.
What is included
Included with air conditioning for extensions and kitchen-diners in Sevenoaks:
- Pressure test, vacuum and commissioning
- Placement clear of the hob and oven
- Hidden routes during the build, or neat surface routes after
- Handover of the remote or app
- One or two units sized for the whole space
Nearby
Neighbouring places we cover include Tonbridge (6 miles), Swanley (9 miles) and Tunbridge Wells (10 miles). See all services in Sevenoaks or air conditioning for extensions and kitchen-diners across Kent.