Air conditioning for extensions and kitchen-diners in Sunbury-on-Thames
For a kitchen-diner in Sunbury-on-Thames, we place the indoor unit clear of the hob and plan the outdoor unit at the rear. Hot spells reach the South East early, which makes spring the easiest time to arrange an installation.
An extension in Sunbury-on-Thames with a roof lantern or large glazed doors can overheat quickly on a sunny afternoon. We cover Sunbury-on-Thames as part of Surrey, roughly 8 miles from Woking. Postcode districts we cover here include TW16 and TW17.
Prices in Sunbury-on-Thames
For Sunbury-on-Thames, expect roughly £1,745 to £5,445 per space, VAT included, adjusted for typical South East England rates. That is above the UK middle, mainly because labour and access cost more in South East England. What moves a quote in Sunbury-on-Thames up or down is mostly pipe length, how high the outdoor unit goes, and whether a new electrical circuit is needed. For reference, the Large single option in Sunbury-on-Thames (one 5–7 kW unit for a large glazed space) usually comes to 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
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. On a survey in Sunbury-on-Thames 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.
What is included
What a job in Sunbury-on-Thames covers:
- Free survey with glazing and roof heat-gain check
- 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
Nearby, we also cover Walton-on-Thames (1 mile), Hanworth (2 miles) and Ashford, Surrey (3 miles). See all services in Sunbury-on-Thames or air conditioning for extensions and kitchen-diners across Surrey.