Air conditioning for extensions and kitchen-diners in Carmarthen
For a kitchen-diner in Carmarthen, we place the indoor unit clear of the hob and plan the outdoor unit at the rear. In South and Mid Wales, efficient heating is often as important as cooling.
An extension in Carmarthen with a roof lantern or large glazed doors can overheat quickly on a sunny afternoon. Carmarthen is one of the main towns we cover in Dyfed, alongside Llanelli and Ammanford. That includes the SA31 postcode district.
Prices in Carmarthen
Air conditioning for extensions and kitchen-diners in Carmarthen typically comes in at £1,345–£4,095 per space including VAT, based on South and Mid Wales rates. That sits a little below the UK middle, reflecting typical South and Mid Wales labour rates. The biggest variables are the pipe route, access for the outdoor unit and the state of the consumer unit, all of which the survey settles. As an example, the Large single option (one 5–7 kW unit for a large glazed space) would typically be £1,895–£2,595 here.
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
The free survey is where the real price is set: room measurements, pipe and drain routes, electrical checks and the outdoor unit position, all written into your quote. We book surveys in Carmarthen 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 Carmarthen:
- Placement clear of the hob and oven
- Hidden routes during the build, or neat surface routes after
- Pressure test, vacuum and commissioning
- One or two units sized for the whole space
- Free survey with glazing and roof heat-gain check
Nearby
Neighbouring places we cover include Llanelli (13 miles), Ammanford (14 miles) and Gorseinon (17 miles). See all services in Carmarthen or air conditioning for extensions and kitchen-diners across Dyfed.