Air conditioning for extensions and kitchen-diners in Chelmsford
For a kitchen-diner in Chelmsford, we place the indoor unit clear of the hob and plan the outdoor unit at the rear. Long sunny spells in the East of England put conservatories and top-floor rooms under real pressure.
In Chelmsford, a side wall of a single-storey extension is usually the neatest place for the indoor unit. Chelmsford sits around 17 miles from Southend-on-Sea, inside our Essex area. Coverage includes CM1.
Prices in Chelmsford
Budget around £1,595–£4,995 per space including VAT for air conditioning for extensions and kitchen-diners in and around Chelmsford. The East of England is one of the dearer parts of the UK for trades, which shows in the range. 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. Typical Large single work (one 5–7 kW unit for a large glazed space) lands around £2,295–£3,195 in this area.
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
At the survey we look at how each room is used, where the sun hits it and how the pipes can reach the outside wall, then put it all in a written quote. Surveys in Chelmsford cover heat gain, pipe routes, electrics, access and noise to the nearest neighbour, so surprises on the day are rare.
What is included
Included with air conditioning for extensions and kitchen-diners in Chelmsford:
- One or two units sized for the whole space
- Hidden routes during the build, or neat surface routes after
- Pressure test, vacuum and commissioning
- Free survey with glazing and roof heat-gain check
- Handover of the remote or app
Nearby
Neighbouring places we cover include Billericay (8 miles), Witham (9 miles) and Maldon (9 miles). See all services in Chelmsford or air conditioning for extensions and kitchen-diners across Essex.