Northwood, Greater London
Positive input ventilation (PIV) in Northwood
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Northwood and HA5, HA6 and WD19.
- From £950 inc VAT per home
- Free survey
PIV can suit Northwood houses and flats because it treats the whole home from one quiet unit.
Customers in Northwood can get a guide price online in a couple of minutes. It uses London rates, which is what we would charge for the same job anywhere in Greater London. We survey first, free of charge for new installations on the mainland, then send a fixed written quote.
PIV in Northwood at a glance
- Town
- Northwood, Greater London
- Postcode districts
- HA5, HA6 and WD19
- Nearby
- Northwood Hills (1 mile), Croxley Green (2 miles) and Pinner (2 miles)
- Price region
- London
- Survey
- Free survey (UK mainland)
PIV for Northwood homes
Flats without a loft use a wall-mounted unit that draws air from outside through a cored hole. PIV works well in houses and flats with general condensation on windows and cold walls.
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 Northwood
| 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
- The house feels stuffy and damp rather than cold
- Washing dried indoors makes everything worse
- You have no loft but still need whole-flat ventilation (wall unit)
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 Northwood
Is the survey free in Northwood?
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 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.
Will PIV make my house cold?
Most units temper or reduce the flow when the incoming air is cold, and a heated unit warms it. Placed correctly on the landing, the air spreads gently rather than blowing on anyone.
How do I get a price for a PIV unit in Northwood?
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 Northwood do you work in?
All of Greater London. Near Northwood that includes Northwood Hills, Croxley Green, Pinner and Batchworth.
Most Northwood PIV jobs are done in half a day, so ask about the next available date.
PIV near Northwood
More services in Northwood
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.