Air conditioning for extensions and kitchen-diners in Chatham
The South East sees some of the UK's warmest summer days, and south-facing rooms and conservatories feel it first. In Chatham, a side wall of a single-storey extension is usually the neatest place for the indoor unit.
An extension in Chatham with a roof lantern or large glazed doors can overheat quickly on a sunny afternoon. Our Kent coverage takes in Chatham, about 8 miles from Maidstone. That includes the ME4 postcode district.
Prices in Chatham
Budget around £1,745–£5,445 per space including VAT for air conditioning for extensions and kitchen-diners in and around Chatham. That is above the UK middle, mainly because labour and access cost more in South East England. Concealed pipework, access equipment for high walls and any electrical work are what push prices towards the upper figure. 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
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
On a survey in Chatham 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. 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
Here is what is included on every job in Chatham:
- Placement clear of the hob and oven
- Handover of the remote or app
- One or two units sized for the whole space
- Pressure test, vacuum and commissioning
- Hidden routes during the build, or neat surface routes after
Nearby
Close to Chatham, our coverage also includes Gillingham (1 mile), Rochester (1 mile) and Strood (2 miles). See all services in Chatham or air conditioning for extensions and kitchen-diners across Kent.