Knowle, West Midlands
Positive input ventilation (PIV) in Knowle
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Knowle and B91, B93 and B94.
- From £795 inc VAT per home
- Free survey
If your Knowle flat has no loft, a wall-mounted PIV unit does the same job through an outside wall.
Work in Knowle follows the rules for England and finishes with a written record of what was fitted and how it was set up.
PIV in Knowle at a glance
- Town
- Knowle, West Midlands
- Postcode districts
- B91, B93 and B94
- Nearby
- Solihull (3 miles), Shirley (4 miles) and Acocks Green (6 miles)
- Price region
- West Midlands
- Survey
- Free survey (UK mainland)
What the work involves
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.
PIV with fan upgrades
PIV plus humidity-controlled extract fans in the kitchen and bathroom for the most stubborn condensation.
Loft-mounted PIV
The most common option for houses with a loft. Usually fitted in half a day.
Guide prices in Knowle
| Work | Guide price |
|---|---|
| Positive input ventilation (PIV) loft unit, supplied and fitted (per home) | £795–£1,395 inc VAT |
| Wall-mounted PIV unit for a flat (core drilled through an outside wall) (per flat) | £995–£1,695 inc VAT |
| Heater module or heated PIV unit (extra over a standard unit) (extra) | £145–£295 inc VAT |
These ranges use our West Midlands rates. Prices include VAT at 20%. You get a fixed written price before any work is booked.
Signs it is time to call us
- Black mould on window reveals and in corners of bedrooms
- Musty smell in wardrobes or behind furniture
- The house feels stuffy and damp rather than cold
Rules that apply in England
English building work follows Approved Document F (2021 edition) for ventilation rates, installation and commissioning. It sets extract rates for kitchens, bathrooms and utilities and asks for mechanical ventilation to be commissioned and recorded.
Questions from Knowle
How do I get a price for a PIV unit in Knowle?
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 Knowle do you work in?
All of the West Midlands. Near Knowle that includes Solihull, Shirley, Acocks Green and Chelmsley Wood.
Do you cover Knowle and nearby?
Yes. We cover Knowle and nearby places including Solihull, Shirley, Acocks Green and Chelmsley Wood. Send your postcode and we will confirm.
Tell us whether your Knowle home has a loft and we can price a PIV unit before visiting.
PIV near Knowle
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Answer a few questions for a price range, or send photos and we will come back to you with a written quote.