Air conditioning for extensions and kitchen-diners in Barnet
An extension in Barnet with a roof lantern or large glazed doors can overheat quickly on a sunny afternoon. Many London homes are flats or tall terraces, where heat rises to the top floor and the bedrooms bear the brunt of a hot spell.
For a kitchen-diner in Barnet, we place the indoor unit clear of the hob and plan the outdoor unit at the rear. We cover Barnet as part of London, roughly 11 miles from central London. Coverage includes EN5.
Prices in Barnet
For Barnet, expect roughly £1,895 to £5,845 per space, VAT included, adjusted for typical London rates. Prices here sit above the national middle, reflecting London labour rates and parking and access costs. Concealed pipework, access equipment for high walls and any electrical work are what push prices towards the upper figure. As an example, the Large single option (one 5–7 kW unit for a large glazed space) would typically be £2,695–£3,745 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
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 Barnet cover heat gain, pipe routes, electrics, access and noise to the nearest neighbour, so surprises on the day are rare.
What is included
Included as standard in Barnet:
- One or two units sized for the whole space
- Free survey with glazing and roof heat-gain check
- Handover of the remote or app
- Placement clear of the hob and oven
- Pressure test, vacuum and commissioning
Nearby
If you are just outside Barnet, we also work in Hadley Wood (2 miles), Potters Bar (3 miles) and Borehamwood (3 miles). See all services in Barnet or air conditioning for extensions and kitchen-diners across London.