Belvedere, Greater London
Positive input ventilation (PIV) in Belvedere
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Belvedere and DA17, DA18 and SE2.
- From £950 inc VAT per home
- Free survey
PIV can suit Belvedere houses and flats because it treats the whole home from one quiet unit.
For positive input ventilation (PIV) in Belvedere, send us the postcode, a few photos and a rough idea of the rooms involved. We will tell you what we would fit and roughly what it costs before arranging a visit.
PIV in Belvedere at a glance
- Town
- Belvedere, Greater London
- Postcode districts
- DA17, DA18 and SE2
- Nearby
- Thamesmead (2 miles), Abbey Wood (2 miles) and Rainham (3 miles)
- Price region
- London
- Survey
- Free survey (UK mainland)
How we approach PIV in Belvedere
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. Flats without a loft use a wall-mounted unit that draws air from outside through a cored hole.
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 Belvedere
| 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
- 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
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 Belvedere
Do you cover Belvedere and nearby?
Yes. We cover Belvedere and nearby places including Thamesmead, Abbey Wood, Rainham and Welling. Send your postcode and we will confirm.
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 much does PIV cost to run?
A standard PIV unit uses very little electricity, comparable to a low-energy light bulb on normal speed. A heated unit costs more in cold spells because the heater switches on when loft air is cold.
What is the price of a PIV unit in Belvedere?
Guide prices for Belvedere 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.
Is the survey free in Belvedere?
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.
Send a photo of your loft hatch area and landing ceiling for a quicker Belvedere quote.
PIV near Belvedere
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Answer a few questions for a price range, or send photos and we will come back to you with a written quote.