Great Bookham, Surrey
Positive input ventilation (PIV) in Great Bookham
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Great Bookham and KT22, KT23 and KT24.
- From £875 inc VAT per home
- Free survey
Condensation in Great Bookham homes usually has one of two answers: better extract fans, or PIV as well.
Customers in Great Bookham can get a guide price online in a couple of minutes. It uses South East rates, which is what we would charge for the same job anywhere in Surrey. Surveys for new installations are free on the UK mainland, with a written quote afterwards.
PIV in Great Bookham at a glance
- Town
- Great Bookham, Surrey
- Postcode districts
- KT22, KT23 and KT24
- Nearby
- Leatherhead (2 miles), Dorking (4 miles) and Ashtead (4 miles)
- Price region
- South East
- Survey
- Free survey (UK mainland)
PIV for Great Bookham 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.
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 Great Bookham
| Work | Guide price |
|---|---|
| Positive input ventilation (PIV) loft unit, supplied and fitted (per home) | £875–£1,525 inc VAT |
| Wall-mounted PIV unit for a flat (core drilled through an outside wall) (per flat) | £1,100–£1,875 inc VAT |
| Heater module or heated PIV unit (extra over a standard unit) (extra) | £160–£325 inc VAT |
South East 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
- 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 Great Bookham
Do you cover Great Bookham and nearby?
Yes. We cover Great Bookham and nearby places including Leatherhead, Dorking, Ashtead and Cobham. Send your postcode and we will confirm.
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.
What is the price of a PIV unit in Great Bookham?
Guide prices for Great Bookham use South East rates: positive input ventilation (PIV) loft unit, supplied and fitted is typically £875 to £1,525 inc VAT per home. We confirm a fixed price in writing before any work starts.
Is the survey free in Great Bookham?
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.
We will check the existing fans in your Great Bookham home at the same visit, because PIV works best with them working.
PIV near Great Bookham
More services in Great Bookham
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