Chislehurst, Greater London
Positive input ventilation (PIV) in Chislehurst
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Chislehurst and BR7, DA14 and SE9.
- From £950 inc VAT per home
- Free survey
PIV is often a good fix for Chislehurst homes with condensation on every window.
Chislehurst is about 115 miles from our base in Great Barr, Birmingham. We book Chislehurst visits by appointment and confirm the date in writing. The survey is free for new installations on the UK mainland, and the quote that follows is fixed and in writing.
PIV in Chislehurst at a glance
- Town
- Chislehurst, Greater London
- Postcode districts
- BR7, DA14 and SE9
- Nearby
- Bickley (2 miles), Sidcup (2 miles) and Eltham (2 miles)
- Price region
- London
- Survey
- Free survey (UK mainland)
PIV for Chislehurst homes
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.
Wall-mounted PIV for flats
Draws air from outside through an outside wall. Suits flats and homes with no loft space.
PIV with fan upgrades
PIV plus humidity-controlled extract fans in the kitchen and bathroom for the most stubborn condensation.
Guide prices in Chislehurst
| 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.
Signs it is time to call us
- Black mould on window reveals and in corners of bedrooms
- Musty smell in wardrobes or behind furniture
- The house feels stuffy and damp rather than cold
Rules that apply in England
In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). It sets extract rates for kitchens, bathrooms and utilities and asks for mechanical ventilation to be commissioned and recorded.
Questions from Chislehurst
What area around Chislehurst do you work in?
All of Greater London. Near Chislehurst that includes Bickley, Sidcup, Eltham and Orpington.
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.
Do you cover Chislehurst and nearby?
Yes. We cover Chislehurst and nearby places including Bickley, Sidcup, Eltham and Orpington. Send your postcode and we will confirm.
What is the price of a PIV unit in Chislehurst?
Guide prices for Chislehurst 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.
Send a photo of your loft hatch area and landing ceiling for a quicker Chislehurst quote.
PIV near Chislehurst
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