Westminster, Greater London
Positive input ventilation (PIV) in Westminster
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Westminster and SW1, SW1E and SW1H.
- From £950 inc VAT per home
- Free survey
PIV is often a good fix for Westminster homes with condensation on every window.
Customers in Westminster can get a guide price online in a couple of minutes. It uses London rates, which is what we would charge for the same job anywhere in Greater London. The survey is free for new installations on the UK mainland, and the quote that follows is fixed and in writing.
PIV in Westminster at a glance
- Town
- Westminster, Greater London
- Postcode districts
- SW1, SW1E and SW1H
- Nearby
- Vincent Square (under a mile), Pimlico (1 mile) and St James's (1 mile)
- Price region
- London
- Survey
- Free survey (UK mainland)
What the work involves
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.
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 Westminster
| 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 |
Guide prices using London rates. Prices include VAT at 20%. A guide price is not a quote: we confirm a fixed price in writing first.
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
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 Westminster
What area around Westminster do you work in?
All of Greater London. Near Westminster that includes Vincent Square, Pimlico, St James's and West End.
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 Westminster and nearby?
Yes. We cover Westminster and nearby places including Vincent Square, Pimlico, St James's and West End. Send your postcode and we will confirm.
What is the price of a PIV unit in Westminster?
Guide prices for Westminster 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.
Get a PIV guide price for your Westminster home online, then confirm it on a free survey.
PIV near Westminster
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