Southall, Greater London
Positive input ventilation (PIV) in Southall
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Southall and UB1, UB2, UB5 and UB6.
- From £950 inc VAT per home
- Free survey
For a typical Southall semi or terrace, a loft PIV unit is often the quickest way to dry the house out.
We cover Southall and the surrounding UB1, UB2, UB5 and UB6 postcodes as part of our work across Greater London. Surveys for new installations are free on the UK mainland, with a written quote afterwards.
PIV in Southall at a glance
- Town
- Southall, Greater London
- Postcode districts
- UB1, UB2, UB5 and UB6
- Nearby
- Greenford (2 miles), Heston (2 miles) and West Ealing (2 miles)
- Price region
- London
- Survey
- Free survey (UK mainland)
How we approach PIV in Southall
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.
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 Southall
| Work | Guide price |
|---|---|
| Positive input ventilation (PIV) loft unit, supplied and fitted (per home) | £950–£1,675 inc VAT |
| Wall-mounted PIV unit for a flat (core drilled through an outside wall) (per flat) | £1,200–£2,025 inc VAT |
| Heater module or heated PIV unit (extra over a standard unit) (extra) | £175–£355 inc VAT |
London 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
- 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
English building work follows Approved Document F (2021 edition) for ventilation rates, installation and commissioning. 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 Southall
How do I get a price for a PIV unit in Southall?
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 Southall do you work in?
All of Greater London. Near Southall that includes Greenford, Heston, West Ealing and Osterley.
Do you cover Southall and nearby?
Yes. We cover Southall and nearby places including Greenford, Heston, West Ealing and Osterley. Send your postcode and we will confirm.
Get a PIV guide price for your Southall home online, then confirm it on a free survey.
PIV near Southall
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