Air conditioning for extensions and kitchen-diners in Heston
For a kitchen-diner in Heston, we place the indoor unit clear of the hob and plan the outdoor unit at the rear. In London, heat soaks into brick and concrete during the day and comes back out at night, which is when it is hardest to sleep.
An extension in Heston with a roof lantern or large glazed doors can overheat quickly on a sunny afternoon. Heston sits around 11 miles from central London, inside our London area. We cover TW5 and the streets around them.
Prices in Heston
Our London guide price for air conditioning for extensions and kitchen-diners is £1,895–£5,845 per space, VAT included. 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. On our London figures, the Large single option (one 5–7 kW unit for a large glazed space) is 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 Heston 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 Heston 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 Heston:
- Handover of the remote or app
- Free survey with glazing and roof heat-gain check
- Pressure test, vacuum and commissioning
- Placement clear of the hob and oven
- Hidden routes during the build, or neat surface routes after
Nearby
We also cover Hounslow (1 mile), Isleworth (2 miles) and Southall (2 miles). See all services in Heston or air conditioning for extensions and kitchen-diners across London.