Air conditioning for extensions and kitchen-diners in New Malden
An extension in New Malden with a roof lantern or large glazed doors can overheat quickly on a sunny afternoon. London's dense streets hold heat overnight, so top-floor flats and loft rooms often stay warm long after sunset.
For a kitchen-diner in New Malden, we place the indoor unit clear of the hob and plan the outdoor unit at the rear. New Malden lies roughly 9 miles from central London, and we cover it as part of London. Homes in KT3 are all within our coverage.
Prices in New Malden
In London, our guide range for air conditioning for extensions and kitchen-diners is £1,895–£5,845 per space, including VAT. That is above the UK middle, mainly because labour and access cost more in London. Concealed pipework, access equipment for high walls and any electrical work are what push prices towards the upper figure. For reference, the Large single option in New Malden (one 5–7 kW unit for a large glazed space) usually comes to about £2,695–£3,745.
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 New Malden 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. Surveys in New Malden cover heat gain, pipe routes, electrics, access and noise to the nearest neighbour, so surprises on the day are rare.
What is included
Every job in New Malden includes:
- Pressure test, vacuum and commissioning
- 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
- Free survey with glazing and roof heat-gain check
Nearby
If you are just outside New Malden, we also work in Surbiton (2 miles), Morden (3 miles) and Wimbledon (3 miles). See all services in New Malden or air conditioning for extensions and kitchen-diners across London.