Air conditioning for extensions and kitchen-diners in Harpenden
Low rainfall and long summer days in the East of England make south-facing rooms the first to overheat. An extension in Harpenden with a roof lantern or large glazed doors can overheat quickly on a sunny afternoon.
For a kitchen-diner in Harpenden, we place the indoor unit clear of the hob and plan the outdoor unit at the rear. Harpenden lies roughly 11 miles from Watford, and we cover it as part of Hertfordshire. That includes the AL5 postcode district.
Prices in Harpenden
In the East of England, our guide range for air conditioning for extensions and kitchen-diners is £1,595–£4,995 per space, including VAT. Prices here sit above the national middle, reflecting East of England labour rates and parking and access costs. 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 Harpenden (one 5–7 kW unit for a large glazed space) usually comes to about £2,295–£3,195.
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
England's rules let most houses fit an outdoor unit without a planning application, as long as the size, number and MCS 020(a) noise conditions are met. Flats, listed buildings and roof-mounted units are treated differently.
The survey
We book surveys in Harpenden at a time that suits you, including early evenings by arrangement, and send the written quote afterwards. On a survey in Harpenden 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
Included with air conditioning for extensions and kitchen-diners in Harpenden:
- One or two units sized for the whole space
- Pressure test, vacuum and commissioning
- Free survey with glazing and roof heat-gain check
- Placement clear of the hob and oven
- Hidden routes during the build, or neat surface routes after
Nearby
If you are just outside Harpenden, we also work in St Albans (5 miles), Luton (5 miles) and Hemel Hempstead (6 miles). See all services in Harpenden or air conditioning for extensions and kitchen-diners across Hertfordshire.