Harrow on the Hill, Greater London
Positive input ventilation (PIV) in Harrow on the Hill
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Harrow on the Hill and HA1, HA2 and HA3.
- From £950 inc VAT per home
- Free survey
Condensation in Harrow on the Hill homes usually has one of two answers: better extract fans, or PIV as well.
Whether the property is in the middle of Harrow on the Hill or one of the villages around it, the process is the same: a look at the building, a written price, then fitting and testing on the agreed day.
PIV in Harrow on the Hill at a glance
- Town
- Harrow on the Hill, Greater London
- Postcode districts
- HA1, HA2 and HA3
- Nearby
- Harrow (under a mile), Sudbury (1 mile) and Headstone (2 miles)
- Price region
- London
- Survey
- Free survey (UK mainland)
PIV for Harrow on the Hill 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 Harrow on the Hill
| 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 |
Guide prices using London rates. Prices include VAT at 20%. A guide price is not a quote: we confirm a fixed price in writing first.
When to get it looked at
- 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
In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). 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 on the Hill
What is the price of a PIV unit in Harrow on the Hill?
Guide prices for Harrow on the Hill 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.
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.
Is the survey free in Harrow on the Hill?
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 do I get a price for a PIV unit in Harrow on the Hill?
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.
Tell us whether your Harrow on the Hill home has a loft and we can price a PIV unit before visiting.
PIV near Harrow on the Hill
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Answer a few questions for a price range, or send photos and we will come back to you with a written quote.