Air conditioning for extensions and kitchen-diners in Hatfield
An extension in Hatfield with a roof lantern or large glazed doors can overheat quickly on a sunny afternoon. 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 Hatfield, a side wall of a single-storey extension is usually the neatest place for the indoor unit. Hatfield is about 11 miles from Watford and falls within our Hertfordshire coverage. That includes the AL10 postcode district.
Prices in Hatfield
Air conditioning for extensions and kitchen-diners in Hatfield 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. Longer or hidden pipe runs, high-level brackets and electrical upgrades are the usual reasons a quote lands at the top of the range. For reference, the Large single option in Hatfield (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
For most houses in Hatfield, 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
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. On a survey in Hatfield 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
Here is what is included on every job in Hatfield:
- Free survey with glazing and roof heat-gain check
- One or two units sized for the whole space
- Handover of the remote or app
- Placement clear of the hob and oven
- Hidden routes during the build, or neat surface routes after
Nearby
We also cover Welwyn Garden City (3 miles), St Albans (5 miles) and Potters Bar (5 miles). See all services in Hatfield or air conditioning for extensions and kitchen-diners across Hertfordshire.