New build and renovation air conditioning in Feltham
First-fix pipework in Feltham extensions goes in while the joists and studs are open. London's dense streets hold heat overnight, so top-floor flats and loft rooms often stay warm long after sunset.
For new Feltham extensions with flat roofs, the outdoor unit position is best agreed against the architect's drawings. Feltham lies roughly 13 miles from central London, and we cover it as part of London. Postcode districts we cover here include TW13.
Prices in Feltham
For Feltham, expect roughly £495 to £1,195 per indoor position (first fix), VAT included, adjusted for typical London rates. Prices here sit above the national middle, reflecting London labour rates and parking and access costs. 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 First and second fix option (complete install priced per room including units) would typically be £1,895–£3,895 here.
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
Because the pipework is built into the structure, coordination with your builder matters more than planning here; the outdoor unit follows the same rules as any other installation.
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 Feltham cover heat gain, pipe routes, electrics, access and noise to the nearest neighbour, so surprises on the day are rare.
What is included
What a job in Feltham covers:
- Design and setting-out with your builder
- First-fix pipework, drains and cables
- Vacuum, charge and commissioning
- Commissioning records for building control files
- Nitrogen pressure test and labelled tails
Nearby
Neighbouring places we cover include Hanworth (2 miles), Ashford, Surrey (2 miles) and Hounslow (3 miles). See all services in Feltham or new build and renovation air conditioning across London.