Northwood Hills, Greater London
Positive input ventilation (PIV) in Northwood Hills
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Northwood Hills and HA4, HA5 and HA6.
- From £950 inc VAT per home
- Free survey
PIV can suit Northwood Hills houses and flats because it treats the whole home from one quiet unit.
Northwood Hills is about 92 miles from our base in Great Barr, Birmingham. We book Northwood Hills visits by appointment and confirm the date in writing. We survey first, free of charge for new installations on the mainland, then send a fixed written quote.
PIV in Northwood Hills at a glance
- Town
- Northwood Hills, Greater London
- Postcode districts
- HA4, HA5 and HA6
- Nearby
- Northwood (1 mile), Pinner (1 mile) and Ruislip (2 miles)
- Price region
- London
- Survey
- Free survey (UK mainland)
What the work involves
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. Flats without a loft use a wall-mounted unit that draws air from outside through a cored hole.
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 Northwood Hills
| 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
- You have no loft but still need whole-flat ventilation (wall unit)
- Streaming windows on most mornings in winter
- Black mould on window reveals and in corners of bedrooms
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 Northwood Hills
Do you cover Northwood Hills and nearby?
Yes. We cover Northwood Hills and nearby places including Northwood, Pinner, Ruislip and Ruislip Manor. Send your postcode and we will confirm.
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 is the price of a PIV unit in Northwood Hills?
Guide prices for Northwood Hills use London rates: positive input ventilation (PIV) loft unit, supplied and fitted is typically £950 to £1,675 inc VAT per home. We confirm a fixed price in writing before any work starts.
Is the survey free in Northwood Hills?
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.
Tell us whether your Northwood Hills home has a loft and we can price a PIV unit before visiting.
PIV near Northwood Hills
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