Chiswick, Greater London
Positive input ventilation (PIV) in Chiswick
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Chiswick and W3, W4 and W6.
- From £950 inc VAT per home
- Free survey
PIV can suit Chiswick houses and flats because it treats the whole home from one quiet unit.
We cover Chiswick and the surrounding W3, W4 and W6 postcodes as part of our work across Greater London. We survey first, free of charge for new installations on the mainland, then send a fixed written quote.
PIV in Chiswick at a glance
- Town
- Chiswick, Greater London
- Postcode districts
- W3, W4 and W6
- Nearby
- Acton (1 mile), Barnes (1 mile) and Kew (2 miles)
- Price region
- London
- Survey
- Free survey (UK mainland)
How we approach PIV in Chiswick
It does not replace extract fans: kitchens and bathrooms still need their own extract to remove steam at source. On survey we check the loft, the landing position and the existing fans, and we tell you if PIV is not the right answer.
PIV with fan upgrades
PIV plus humidity-controlled extract fans in the kitchen and bathroom for the most stubborn condensation.
Loft-mounted PIV
The most common option for houses with a loft. Usually fitted in half a day.
Guide prices in Chiswick
| 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 |
These ranges use our London rates. Prices include VAT at 20%. You get a fixed written price before any work is booked.
Common reasons people call
- Streaming windows on most mornings in winter
- Black mould on window reveals and in corners of bedrooms
- Musty smell in wardrobes or behind furniture
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 Chiswick
Is the survey free in Chiswick?
For new installations on the UK mainland, yes. The survey is free and the quote that follows is fixed and in writing. Servicing, testing and repair visits are charged, and we confirm the cost before booking.
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.
Does PIV really stop condensation?
PIV reduces condensation in most homes because it dilutes moist air and keeps it moving, but it works best alongside working extract fans in the kitchen and bathroom. Leaks, rising damp or a cold bridge need fixing separately.
How do I get a price for a PIV unit in Chiswick?
Use the guide price tool, the form on this page, live chat, WhatsApp or call 0800 088 6341. A postcode and a couple of photos help us give you a useful answer first time.
What area around Chiswick do you work in?
All of Greater London. Near Chiswick that includes Acton, Barnes, Kew and Mortlake.
Tell us whether your Chiswick home has a loft and we can price a PIV unit before visiting.
PIV near Chiswick
More services in Chiswick
Get a guide price in two minutes
Answer a few questions for a price range, or send photos and we will come back to you with a written quote.