Air conditioning for extensions and kitchen-diners in Rickmansworth
Low rainfall and long summer days in the East of England make south-facing rooms the first to overheat. In Rickmansworth, a side wall of a single-storey extension is usually the neatest place for the indoor unit.
An extension in Rickmansworth with a roof lantern or large glazed doors can overheat quickly on a sunny afternoon. Our Hertfordshire coverage takes in Rickmansworth, about 4 miles from Watford. We cover WD3 and the streets around them.
Prices in Rickmansworth
Air conditioning for extensions and kitchen-diners in Rickmansworth typically comes in at £1,595–£4,995 per space including VAT, based on East of England rates. That is above the UK middle, mainly because labour and access cost more in the East of England. Quotes move with the length of the pipe run, where the outdoor unit can sit and how much electrical work the job needs. Typical Large single work (one 5–7 kW unit for a large glazed space) lands around £2,295–£3,195 in this area.
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
We book surveys in Rickmansworth at a time that suits you, including early evenings by arrangement, and send the written quote afterwards. The free survey is where the real price is set: room measurements, pipe and drain routes, electrical checks and the outdoor unit position, all written into your quote.
What is included
Included as standard in Rickmansworth:
- Placement clear of the hob and oven
- Hidden routes during the build, or neat surface routes after
- One or two units sized for the whole space
- Free survey with glazing and roof heat-gain check
- Pressure test, vacuum and commissioning
Nearby
Neighbouring places we cover include Watford (4 miles), North Watford (5 miles) and Bushey (5 miles). See all services in Rickmansworth or air conditioning for extensions and kitchen-diners across Hertfordshire.