Air conditioning for extensions and kitchen-diners in Llanelli
An extension in Llanelli with a roof lantern or large glazed doors can overheat quickly on a sunny afternoon. South Wales summers can be warm and humid, and winters damp, so a reversible system earns its keep all year.
In Llanelli, a side wall of a single-storey extension is usually the neatest place for the indoor unit. Llanelli is about 13 miles from Carmarthen and falls within our Dyfed coverage. Homes in SA15 are all within our coverage.
Prices in Llanelli
For Llanelli, 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. 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. For reference, the Large single option in Llanelli (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 Llanelli cover heat gain, pipe routes, electrics, access and noise to the nearest neighbour, so surprises on the day are rare. A survey in Llanelli 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.
What is included
Included as standard in Llanelli:
- One or two units sized for the whole space
- Hidden routes during the build, or neat surface routes after
- Free survey with glazing and roof heat-gain check
- Pressure test, vacuum and commissioning
- Handover of the remote or app
Nearby
Neighbouring places we cover include Gorseinon (5 miles), Swansea (10 miles) and Ammanford (11 miles). See all services in Llanelli or air conditioning for extensions and kitchen-diners across Dyfed.