Welling, Greater London
Positive input ventilation (PIV) in Welling
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Welling and DA6, DA15 and DA16.
- From £950 inc VAT per home
- Free survey
If your Welling flat has no loft, a wall-mounted PIV unit does the same job through an outside wall.
For positive input ventilation (PIV) in Welling, 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 Welling at a glance
- Town
- Welling, Greater London
- Postcode districts
- DA6, DA15 and DA16
- Nearby
- Abbey Wood (2 miles), Plumstead (2 miles) and Bexley (2 miles)
- Price region
- London
- Survey
- Free survey (UK mainland)
PIV for Welling homes
PIV works well in houses and flats with general condensation on windows and cold walls. It does not replace extract fans: kitchens and bathrooms still need their own extract to remove steam at source.
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 Welling
| 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.
Signs it is time to call us
- Musty smell in wardrobes or behind furniture
- The house feels stuffy and damp rather than cold
- Washing dried indoors makes everything worse
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 Welling
What area around Welling do you work in?
All of Greater London. Near Welling that includes Abbey Wood, Plumstead, Bexley and Sidcup.
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.
Do you cover Welling and nearby?
Yes. We cover Welling and nearby places including Abbey Wood, Plumstead, Bexley and Sidcup. Send your postcode and we will confirm.
What is the price of a PIV unit in Welling?
Guide prices for Welling 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.
Tell us whether your Welling home has a loft and we can price a PIV unit before visiting.
PIV near Welling
More services in Welling
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.