New build and renovation air conditioning in Isleworth
For new Isleworth extensions with flat roofs, the outdoor unit position is best agreed against the architect's drawings. London's dense streets hold heat overnight, so top-floor flats and loft rooms often stay warm long after sunset.
Renovations in Isleworth are the easiest jobs to make invisible, because the pipework goes in before the plaster. Isleworth sits around 10 miles from central London, inside our London area. We cover TW7 and the streets around them.
Prices in Isleworth
For Isleworth, expect roughly £495 to £1,195 per indoor position (first fix), VAT included, adjusted for typical 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. Typical First and second fix work (complete install priced per room including units) lands around £1,895–£3,895 in this area.
First fix only
Pipework and drains to each position for a later install.
First and second fix
Complete install priced per room including units.
Ducted design and build
Concealed ducted system designed into the build.
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%.
Working with your builder
On build projects the main thing is timing with your builder and electrician; we fit first-fix pipework before plastering and agree the outdoor unit position early.
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. Surveys in Isleworth cover heat gain, pipe routes, electrics, access and noise to the nearest neighbour, so surprises on the day are rare.
What is included
Every job in Isleworth includes:
- Design and setting-out with your builder
- Commissioning records for building control files
- Second-fix unit installation
- Vacuum, charge and commissioning
- Nitrogen pressure test and labelled tails
Nearby
Nearby, we also cover Hounslow (under a mile), Heston (2 miles) and Richmond (2 miles). See all services in Isleworth or new build and renovation air conditioning across London.