Chesham, Buckinghamshire
Positive input ventilation (PIV) in Chesham
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Chesham and HP5, HP6 and HP7.
- From £875 inc VAT per home
- Free survey
Condensation in Chesham homes usually has one of two answers: better extract fans, or PIV as well.
Whether the property is in the middle of Chesham or one of the villages around it, the process is the same: a look at the building, a written price, then fitting and testing on the agreed day.
PIV in Chesham at a glance
- Town
- Chesham, Buckinghamshire
- Postcode districts
- HP5, HP6 and HP7
- Nearby
- Amersham on the Hill (2 miles), Amersham (2 miles) and Berkhamsted (4 miles)
- Price region
- South East
- Survey
- Free survey (UK mainland)
How we approach PIV in Chesham
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.
Heated PIV
A heater module tempers the incoming air in cold weather. Useful in homes where people feel draughts.
Wall-mounted PIV for flats
Draws air from outside through an outside wall. Suits flats and homes with no loft space.
Guide prices in Chesham
| 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
- Washing dried indoors makes everything worse
- You have no loft but still need whole-flat ventilation (wall unit)
- Streaming windows on most mornings in winter
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 Chesham
What area around Chesham do you work in?
All of Buckinghamshire. Near Chesham that includes Amersham on the Hill, Amersham, Berkhamsted and Chorleywood.
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.
Do you cover Chesham and nearby?
Yes. We cover Chesham and nearby places including Amersham on the Hill, Amersham, Berkhamsted and Chorleywood. Send your postcode and we will confirm.
What is the price of a PIV unit in Chesham?
Guide prices for Chesham 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.
Get a PIV guide price for your Chesham home online, then confirm it on a free survey.
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