Air conditioning for extensions and kitchen-diners in Marlborough
For a kitchen-diner in Marlborough, we place the indoor unit clear of the hob and plan the outdoor unit at the rear. In the South West, a system that heats well through damp winters is often as valuable as summer cooling.
In Marlborough, a side wall of a single-storey extension is usually the neatest place for the indoor unit. Our Wiltshire coverage takes in Marlborough, about 10 miles from Swindon. Coverage includes SN8.
Prices in Marlborough
Guide prices around Marlborough run from £1,450 to £4,450 per space including VAT. That is close to the UK middle for this kind of work. What moves a quote in Marlborough up or down is mostly pipe length, how high the outdoor unit goes, and whether a new electrical circuit is needed. On our South West England figures, the Large single option (one 5–7 kW unit for a large glazed space) is about £2,050–£2,850.
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 Marlborough 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. We book surveys in Marlborough at a time that suits you, including early evenings by arrangement, and send the written quote afterwards.
What is included
Included as standard in Marlborough:
- Placement clear of the hob and oven
- One or two units sized for the whole space
- Free survey with glazing and roof heat-gain check
- Pressure test, vacuum and commissioning
- Hidden routes during the build, or neat surface routes after
Nearby
Nearby, we also cover Swindon (10 miles), Calne (12 miles) and Devizes (12 miles). See all services in Marlborough or air conditioning for extensions and kitchen-diners across Wiltshire.