Cheam, Greater London
Positive input ventilation (PIV) in Cheam
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Cheam and SM1, SM2 and SM3.
- From £950 inc VAT per home
- Free survey
We fit loft and wall-mounted PIV units across Cheam, after checking the house first.
Customers in Cheam 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 Cheam at a glance
- Town
- Cheam, Greater London
- Postcode districts
- SM1, SM2 and SM3
- Nearby
- Sutton (1 mile), Ewell (2 miles) and Belmont (2 miles)
- Price region
- London
- Survey
- Free survey (UK mainland)
How we approach PIV in Cheam
It does not replace extract fans: kitchens and bathrooms still need their own extract to remove steam at source. On survey we check the loft, the landing position and the existing fans, and we tell you if PIV is not the right answer.
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 Cheam
| 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
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 Cheam
Do you cover Cheam and nearby?
Yes. We cover Cheam and nearby places including Sutton, Ewell, Belmont and Worcester Park. Send your postcode and we will confirm.
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.
What is the price of a PIV unit in Cheam?
Guide prices for Cheam 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 Cheam?
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.
Tell us whether your Cheam home has a loft and we can price a PIV unit before visiting.
PIV near Cheam
More services in Cheam
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.