Greenwich, Greater London
Positive input ventilation (PIV) in Greenwich
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Greenwich and SE3, SE7, SE10 and SE12.
- From £950 inc VAT per home
- Free survey
Condensation in Greenwich homes usually has one of two answers: better extract fans, or PIV as well.
We cover Greenwich and the surrounding SE3, SE7, SE10 and SE12 postcodes as part of our work across Greater London. Surveys for new installations are free on the UK mainland, with a written quote afterwards.
PIV in Greenwich at a glance
- Town
- Greenwich, Greater London
- Postcode districts
- SE3, SE7, SE10 and SE12
- Nearby
- New Cross (1 mile), Blackheath (1 mile) and Brockley (1 mile)
- Price region
- London
- Survey
- Free survey (UK mainland)
What the work involves
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.
Loft-mounted PIV
The most common option for houses with a loft. Usually fitted in half a day.
Heated PIV
A heater module tempers the incoming air in cold weather. Useful in homes where people feel draughts.
Guide prices in Greenwich
| 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.
When to get it looked at
- 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
In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). For homes, it sets minimum extract rates such as 15 litres a second for a bathroom and 30 or 60 for a kitchen, and expects mechanical systems to be airflow-tested.
Questions from Greenwich
What area around Greenwich do you work in?
All of Greater London. Near Greenwich that includes New Cross, Blackheath, Brockley and Ladywell.
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.
Will PIV make my house cold?
Most units temper or reduce the flow when the incoming air is cold, and a heated unit warms it. Placed correctly on the landing, the air spreads gently rather than blowing on anyone.
Do you cover Greenwich and nearby?
Yes. We cover Greenwich and nearby places including New Cross, Blackheath, Brockley and Ladywell. Send your postcode and we will confirm.
What is the price of a PIV unit in Greenwich?
Guide prices for Greenwich 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 Greenwich quote.
PIV near Greenwich
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