Air conditioning for extensions and kitchen-diners in Borehamwood
The East of England is one of the sunniest and driest parts of the UK, which makes glazed rooms and lofts hard to keep cool. In Borehamwood, a side wall of a single-storey extension is usually the neatest place for the indoor unit.
An extension in Borehamwood with a roof lantern or large glazed doors can overheat quickly on a sunny afternoon. Borehamwood is about 5 miles from Watford and falls within our Hertfordshire coverage. Postcode districts we cover here include WD6.
Prices in Borehamwood
Our East of England guide price for air conditioning for extensions and kitchen-diners is £1,595–£4,995 per space, VAT included. That is above the UK middle, mainly because labour and access cost more in the East of England. Concealed pipework, access equipment for high walls and any electrical work are what push prices towards the upper figure. For reference, the Large single option in Borehamwood (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
Since 29 May 2025, England's permitted development rules allow larger outdoor units (up to 1.5 m³) and no longer require a 1 m gap to the boundary, provided the MCS 020(a) noise check is met. Listed buildings and pitched-roof installs still need permission.
The survey
On a survey in Borehamwood 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. At the survey we look at how each room is used, where the sun hits it and how the pipes can reach the outside wall, then put it all in a written quote.
What is included
Included with air conditioning for extensions and kitchen-diners in Borehamwood:
- Placement clear of the hob and oven
- Hidden routes during the build, or neat surface routes after
- Pressure test, vacuum and commissioning
- Free survey with glazing and roof heat-gain check
- Handover of the remote or app
Nearby
Nearby, we also cover Barnet (3 miles), Bushey (4 miles) and Hadley Wood (5 miles). See all services in Borehamwood or air conditioning for extensions and kitchen-diners across Hertfordshire.