Thornbury, Gloucestershire
Positive input ventilation (PIV) in Thornbury
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Thornbury and BS32, BS35 and GL12.
- From £825 inc VAT per home
- Free survey
PIV is often a good fix for Thornbury homes with condensation on every window.
For positive input ventilation (PIV) in Thornbury, send us the postcode, a few photos and a rough idea of the rooms involved. We will tell you what we would fit and roughly what it costs before arranging a visit.
PIV in Thornbury at a glance
- Town
- Thornbury, Gloucestershire
- Postcode districts
- BS32, BS35 and GL12
- Nearby
- Stoke Gifford (6 miles), Yate (6 miles) and Mangotsfield (8 miles)
- Price region
- South West
- Survey
- Free survey (UK mainland)
PIV for Thornbury 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.
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 Thornbury
| Work | Guide price |
|---|---|
| Positive input ventilation (PIV) loft unit, supplied and fitted (per home) | £825–£1,450 inc VAT |
| Wall-mounted PIV unit for a flat (core drilled through an outside wall) (per flat) | £1,025–£1,775 inc VAT |
| Heater module or heated PIV unit (extra over a standard unit) (extra) | £150–£305 inc VAT |
These ranges use our South West rates. Prices include VAT at 20%. You get a fixed written price before any work is booked.
Signs it is time to call us
- Musty smell in wardrobes or behind furniture
- The house feels stuffy and damp rather than cold
- Washing dried indoors makes everything worse
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 Thornbury
How do I get a price for a PIV unit in Thornbury?
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.
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 area around Thornbury do you work in?
All of Gloucestershire. Near Thornbury that includes Stoke Gifford, Yate, Mangotsfield and Dursley.
Do you cover Thornbury and nearby?
Yes. We cover Thornbury and nearby places including Stoke Gifford, Yate, Mangotsfield and Dursley. Send your postcode and we will confirm.
Send a photo of your loft hatch area and landing ceiling for a quicker Thornbury quote.
PIV near Thornbury
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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.