Air conditioning for extensions and kitchen-diners across South Glamorgan
In Cardiff, a side wall of a single-storey extension is usually the neatest place for the indoor unit. For a kitchen-diner in Cardiff, we place the indoor unit clear of the hob and plan the outdoor unit at the rear. Humid summer spells in South Wales make dehumidifying and cooling equally welcome.
Prices in South Glamorgan
For South Glamorgan, expect roughly £1,345 to £4,095 per space, VAT included, adjusted for typical South and Mid Wales rates. That sits a little below the UK middle, reflecting typical South and Mid Wales labour rates. 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 South Glamorgan (one 5–7 kW unit for a large glazed space) usually comes to 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
Surveys in South Glamorgan cover heat gain, pipe routes, electrics, access and noise to the nearest neighbour, so surprises on the day are rare. We book surveys in South Glamorgan 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 across South Glamorgan:
- Pressure test, vacuum and commissioning
- Placement clear of the hob and oven
- One or two units sized for the whole space
- Hidden routes during the build, or neat surface routes after
- Handover of the remote or app
- Free survey with glazing and roof heat-gain check
Towns in South Glamorgan
Pick your town for local details, or see every service in South Glamorgan.