Air conditioning for extensions and kitchen-diners in Cardiff
Wet South Wales winters make a heat pump's quiet, even heating and dehumidifying mode useful well beyond summer. For a kitchen-diner in Cardiff, we place the indoor unit clear of the hob and plan the outdoor unit at the rear.
An extension in Cardiff with a roof lantern or large glazed doors can overheat quickly on a sunny afternoon. We cover Cardiff and the rest of South Glamorgan, including Barry and Penarth. Postcode districts we cover here include CF10, CF11, CF14, CF15, CF23 and CF24.
Prices in Cardiff
Our South and Mid Wales guide price for air conditioning for extensions and kitchen-diners is £1,345–£4,095 per space, VAT included. It is a touch below the UK middle, as trade rates in South and Mid Wales tend to be. Concealed pipework, access equipment for high walls and any electrical work are what push prices towards the upper figure. On our South and Mid Wales figures, the Large single option (one 5–7 kW unit for a large glazed space) is about £1,895–£2,595.
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 1 June 2026, Welsh permitted development rules for outdoor units closely match England's: up to 1.5 m³, two units on a detached home, one on other homes, and MCS 020a noise compliance. Listed buildings need consent, and conservation areas have extra restrictions on units facing a road.
The survey
A survey in Cardiff 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 Cardiff at a time that suits you, including early evenings by arrangement, and send the written quote afterwards.
What is included
Included with air conditioning for extensions and kitchen-diners in Cardiff:
- Hidden routes during the build, or neat surface routes after
- Placement clear of the hob and oven
- Handover of the remote or app
- Free survey with glazing and roof heat-gain check
- One or two units sized for the whole space
Nearby
We also cover Penarth (3 miles), Dinas Powys (3 miles) and Caerphilly (7 miles). See all services in Cardiff or air conditioning for extensions and kitchen-diners across South Glamorgan.