Ducted air conditioning in Carshalton
The urban heat island effect means London bedrooms can stay uncomfortably warm on summer nights. For a renovation in Carshalton, the best time to plan ducted cooling is before the plasterers arrive.
Ducted systems suit Carshalton loft conversions and new extensions where ceilings are being boarded anyway. Our London coverage takes in Carshalton, about 9 miles from central London. We cover SM5 and the streets around them.
Prices in Carshalton
Ducted air conditioning in Carshalton typically comes in at £7,195–£19,745 per system including VAT, based on London rates. London is one of the dearer parts of the UK for trades, which shows in the range. Quotes move with the length of the pipe run, where the outdoor unit can sit and how much electrical work the job needs. As an example, the Zoned option (motorised dampers or two units for separate floors or room groups) would typically be £9,845–£14,445 here.
Single zone
One ducted unit serving two or three rooms from a loft or void.
Zoned
Motorised dampers or two units for separate floors or room groups.
Whole home
Multiple ducted units with linear slot diffusers and smart control.
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
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. On a survey in Carshalton 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 as standard in Carshalton:
- Wall controller or app control
- Free survey with ceiling-void and loft inspection
- Concealed fan unit and outdoor unit sized to the zone
- Access hatch and condensate route planned in
- Insulated ductwork, plenums and grilles
Nearby
We also cover Sutton (2 miles), Mitcham (2 miles) and Morden (2 miles). See all services in Carshalton or ducted air conditioning across London.