Marlow, Buckinghamshire
Positive input ventilation (PIV) in Marlow
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Marlow and SL6, SL7 and SL8.
- From £875 inc VAT per home
- Free survey
Condensation in Marlow homes usually has one of two answers: better extract fans, or PIV as well.
We cover Marlow and the surrounding SL6, SL7 and SL8 postcodes as part of our work across Buckinghamshire. Surveys for new installations are free on the UK mainland, with a written quote afterwards.
PIV in Marlow at a glance
- Town
- Marlow, Buckinghamshire
- Postcode districts
- SL6, SL7 and SL8
- Nearby
- Maidenhead (4 miles), High Wycombe (4 miles) and Burnham (5 miles)
- Price region
- South East
- 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.
Wall-mounted PIV for flats
Draws air from outside through an outside wall. Suits flats and homes with no loft space.
PIV with fan upgrades
PIV plus humidity-controlled extract fans in the kitchen and bathroom for the most stubborn condensation.
Guide prices in Marlow
| 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 |
These ranges use our South East rates. Prices include VAT at 20%. You get a fixed written price before any work is booked.
When to get it looked at
- Streaming windows on most mornings in winter
- Black mould on window reveals and in corners of bedrooms
- Musty smell in wardrobes or behind furniture
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). It sets extract rates for kitchens, bathrooms and utilities and asks for mechanical ventilation to be commissioned and recorded.
Questions from Marlow
Do you cover Marlow and nearby?
Yes. We cover Marlow and nearby places including Maidenhead, High Wycombe, Burnham and Henley-on-Thames. Send your postcode and we will confirm.
Can PIV be fitted in a flat?
Yes. Flats without loft space use a wall-mounted PIV unit that draws air from outside through an outside wall.
How long does PIV installation take?
A loft unit is normally fitted in two to four hours, including the diffuser and electrical connection.
What is the price of a PIV unit in Marlow?
Guide prices for Marlow 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 Marlow?
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 Marlow home at the same visit, because PIV works best with them working.
PIV near Marlow
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