Friern Barnet, Greater London
Positive input ventilation (PIV) in Friern Barnet
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Friern Barnet and N11, N12 and N20.
- From £950 inc VAT per home
- Free survey
PIV can suit Friern Barnet houses and flats because it treats the whole home from one quiet unit.
Work in Friern Barnet follows the rules for England and finishes with a written record of what was fitted and how it was set up.
PIV in Friern Barnet at a glance
- Town
- Friern Barnet, Greater London
- Postcode districts
- N11, N12 and N20
- Nearby
- Muswell Hill (2 miles), Finchley (2 miles) and Wood Green (2 miles)
- Price region
- London
- Survey
- Free survey (UK mainland)
What the work involves
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 Friern Barnet
| 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.
Common reasons people call
- 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. 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 Friern Barnet
Is the survey free in Friern Barnet?
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.
How much does PIV cost to install?
A loft-mounted PIV unit usually costs £795 to £1,395 including VAT supplied and fitted, and £995 to £1,695 for a wall-mounted unit in a flat. A heater module adds around £145 to £295.
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 do I get a price for a PIV unit in Friern Barnet?
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.
What area around Friern Barnet do you work in?
All of Greater London. Near Friern Barnet that includes Muswell Hill, Finchley, Wood Green and Palmers Green.
Most Friern Barnet PIV jobs are done in half a day, so ask about the next available date.
PIV near Friern Barnet
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