Air conditioning for extensions and kitchen-diners in Weymouth
South West summers are milder on the coast, but sheltered towns and south-facing rooms still overheat, and efficient winter heating matters just as much. In Weymouth, a side wall of a single-storey extension is usually the neatest place for the indoor unit.
An extension in Weymouth with a roof lantern or large glazed doors can overheat quickly on a sunny afternoon. Weymouth is about 26 miles from Bournemouth and falls within our Dorset coverage. That includes the DT3 and DT4 postcode districts.
Prices in Weymouth
Guide prices around Weymouth run from £1,450 to £4,450 per space including VAT. That is close to the UK middle for this kind of work. Quotes move with the length of the pipe run, where the outdoor unit can sit and how much electrical work the job needs. 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
For most houses in Weymouth, the outdoor unit is permitted development if it passes the MCS 020(a) noise check (37 dB(A) or less at the nearest neighbouring window) and stays within the size and number limits. We run that check on survey.
The survey
We book surveys in Weymouth at a time that suits you, including early evenings by arrangement, and send the written quote afterwards. On a survey in Weymouth the engineer looks at room size, glazing, the route for pipes and drains, the electrics and where the outdoor unit can sit quietly, then the written quote follows.
What is included
What a job in Weymouth covers:
- Hidden routes during the build, or neat surface routes after
- Placement clear of the hob and oven
- One or two units sized for the whole space
- Handover of the remote or app
- Free survey with glazing and roof heat-gain check
Nearby
We also cover Dorchester (7 miles), Bridport (15 miles) and Wareham (16 miles). See all services in Weymouth or air conditioning for extensions and kitchen-diners across Dorset.