Feltham, Greater London
Positive input ventilation (PIV) in Feltham
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Feltham and TW4, TW13 and TW14.
- From £950 inc VAT per home
- Free survey
PIV can suit Feltham houses and flats because it treats the whole home from one quiet unit.
Work in Feltham follows the rules for England and finishes with a written record of what was fitted and how it was set up.
PIV in Feltham at a glance
- Town
- Feltham, Greater London
- Postcode districts
- TW4, TW13 and TW14
- Nearby
- Hanworth (2 miles), Cranford (2 miles) and Ashford (2 miles)
- Price region
- London
- Survey
- Free survey (UK mainland)
What the work involves
Loft air is usually a little warmer and drier than outside air, and the unit filters it before it comes down into the house. Many units have a temperature sensor that reduces the flow or switches to a heater module on cold days, so the incoming air does not feel like a draught.
Heated PIV
A heater module tempers the incoming air in cold weather. Useful in homes where people feel draughts.
Wall-mounted PIV for flats
Draws air from outside through an outside wall. Suits flats and homes with no loft space.
Guide prices in Feltham
| Work | Guide price |
|---|---|
| Positive input ventilation (PIV) loft unit, supplied and fitted (per home) | £950–£1,675 inc VAT |
| Wall-mounted PIV unit for a flat (core drilled through an outside wall) (per flat) | £1,200–£2,025 inc VAT |
| Heater module or heated PIV unit (extra over a standard unit) (extra) | £175–£355 inc VAT |
London rates shown. Prices include VAT at 20%. The fixed price is confirmed in writing after we have seen the job.
Common reasons people call
- The house feels stuffy and damp rather than cold
- Washing dried indoors makes everything worse
- You have no loft but still need whole-flat ventilation (wall unit)
Rules that apply in England
English building work follows Approved Document F (2021 edition) for ventilation rates, installation and commissioning. It sets extract rates for kitchens, bathrooms and utilities and asks for mechanical ventilation to be commissioned and recorded.
Questions from Feltham
What area around Feltham do you work in?
All of Greater London. Near Feltham that includes Hanworth, Cranford, Ashford and Hounslow.
How long does PIV installation take?
A loft unit is normally fitted in two to four hours, including the diffuser and electrical connection.
How much does PIV cost to install?
A loft-mounted PIV unit usually costs £795 to £1,395 including VAT supplied and fitted, and £995 to £1,695 for a wall-mounted unit in a flat. A heater module adds around £145 to £295.
Do you cover Feltham and nearby?
Yes. We cover Feltham and nearby places including Hanworth, Cranford, Ashford and Hounslow. Send your postcode and we will confirm.
What is the price of a PIV unit in Feltham?
Guide prices for Feltham use London rates: positive input ventilation (PIV) loft unit, supplied and fitted is typically £950 to £1,675 inc VAT per home. We confirm a fixed price in writing before any work starts.
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PIV near Feltham
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