Harrow Weald, Greater London
Positive input ventilation (PIV) in Harrow Weald
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Harrow Weald and HA1, HA3 and HA7.
- From £950 inc VAT per home
- Free survey
For a typical Harrow Weald semi or terrace, a loft PIV unit is often the quickest way to dry the house out.
Harrow Weald is about 93 miles from our base in Great Barr, Birmingham. We book Harrow Weald visits by appointment and confirm the date in writing. Surveys for new installations are free on the UK mainland, with a written quote afterwards.
PIV in Harrow Weald at a glance
- Town
- Harrow Weald, Greater London
- Postcode districts
- HA1, HA3 and HA7
- Nearby
- Wealdstone (1 mile), Headstone (1 mile) and Harrow (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.
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 Harrow Weald
| 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 |
These ranges use our London rates. Prices include VAT at 20%. You get a fixed written price before any work is booked.
When to get it looked at
- 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. 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 Harrow Weald
Is the survey free in Harrow Weald?
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.
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.
Can PIV be fitted in a flat?
Yes. Flats without loft space use a wall-mounted PIV unit that draws air from outside through an outside wall.
How do I get a price for a PIV unit in Harrow Weald?
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 Harrow Weald do you work in?
All of Greater London. Near Harrow Weald that includes Wealdstone, Headstone, Harrow and Pinner.
Tell us whether your Harrow Weald home has a loft and we can price a PIV unit before visiting.
PIV near Harrow Weald
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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.