Air conditioning for extensions and kitchen-diners in Holywood
Damp Northern Ireland winters make a heat pump's dehumidifying mode useful well beyond the summer. In Holywood, a side wall of a single-storey extension is usually the neatest place for the indoor unit.
An extension in Holywood with a roof lantern or large glazed doors can overheat quickly on a sunny afternoon. Our County Down coverage takes in Holywood, about 6 miles from Bangor, County Down. Coverage includes BT18.
Prices in Holywood
Air conditioning for extensions and kitchen-diners in Holywood typically comes in at £1,345–£4,095 per space including VAT, based on Northern Ireland rates. It is a touch below the UK middle, as trade rates in Northern Ireland tend to be. What moves a quote in Holywood up or down is mostly pipe length, how high the outdoor unit goes, and whether a new electrical circuit is needed. 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
Planning rules for outdoor units in Northern Ireland differ from Great Britain's, so we check your property with you and the council where needed.
The survey
Surveys in Holywood cover heat gain, pipe routes, electrics, access and noise to the nearest neighbour, so surprises on the day are rare. A survey in Holywood 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
Every job in Holywood includes:
- Placement clear of the hob and oven
- Pressure test, vacuum and commissioning
- Free survey with glazing and roof heat-gain check
- One or two units sized for the whole space
- Hidden routes during the build, or neat surface routes after
Nearby
Neighbouring places we cover include Newtownabbey (4 miles), Belfast (5 miles) and Castlereagh (5 miles). See all services in Holywood or air conditioning for extensions and kitchen-diners across County Down.

