Knightsbridge and Belgravia, Greater London
Positive input ventilation (PIV) in Knightsbridge and Belgravia
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Knightsbridge and Belgravia and SW1X, SW7 and W1K.
- From £950 inc VAT per home
- Free survey
PIV can suit Knightsbridge and Belgravia houses and flats because it treats the whole home from one quiet unit.
Customers in Knightsbridge and Belgravia 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. We survey first, free of charge for new installations on the mainland, then send a fixed written quote.
PIV in Knightsbridge and Belgravia at a glance
- Town
- Knightsbridge and Belgravia, Greater London
- Postcode districts
- SW1X, SW7 and W1K
- Nearby
- West End of London (1 mile), Hyde Park (1 mile) and Bayswater (1 mile)
- Price region
- London
- Survey
- Free survey (UK mainland)
PIV for Knightsbridge and Belgravia 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.
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 Knightsbridge and Belgravia
| 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.
Common reasons people call
- You have no loft but still need whole-flat ventilation (wall unit)
- Streaming windows on most mornings in winter
- Black mould on window reveals and in corners of bedrooms
Rules that apply in England
English building work follows Approved Document F (2021 edition) for ventilation rates, installation and commissioning. 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 Knightsbridge and Belgravia
Is the survey free in Knightsbridge and Belgravia?
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.
How long does PIV installation take?
A loft unit is normally fitted in two to four hours, including the diffuser and electrical connection.
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.
How do I get a price for a PIV unit in Knightsbridge and Belgravia?
Use the guide price tool, the form on this page, live chat, WhatsApp or call 0800 088 6341. A postcode and a couple of photos help us give you a useful answer first time.
What area around Knightsbridge and Belgravia do you work in?
All of Greater London. Near Knightsbridge and Belgravia that includes West End of London, Hyde Park, Bayswater and Lancaster Gate.
Get a PIV guide price for your Knightsbridge and Belgravia home online, then confirm it on a free survey.
PIV near Knightsbridge and Belgravia
More services in Knightsbridge and Belgravia
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.