Positive input ventilation (PIV) in Hornsey

PIV can suit Hornsey houses and flats because it treats the whole home from one quiet unit.

Work in Hornsey follows the rules for England and finishes with a written record of what was fitted and how it was set up.

PIV in Hornsey at a glance

Town: Hornsey, Greater London
Postcode districts: N8, N10 and N22
Nearby: Crouch End (under a mile), Muswell Hill (1 mile) and Wood Green (1 mile)
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.

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 Hornsey

Positive input ventilation (PIV) guide prices in Hornsey
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.

Common reasons people call

Washing dried indoors makes everything worse
You have no loft but still need whole-flat ventilation (wall unit)
Streaming windows on most mornings in winter

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 Hornsey

Do you cover Hornsey and nearby?

Yes. We cover Hornsey and nearby places including Crouch End, Muswell Hill, Wood Green and Stroud Green. Send your postcode and we will confirm.

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 long does PIV installation take?

A loft unit is normally fitted in two to four hours, including the diffuser and electrical connection.

What is the price of a PIV unit in Hornsey?

Guide prices for Hornsey 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 Hornsey?

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.

We will check the existing fans in your Hornsey home at the same visit, because PIV works best with them working.