Positive input ventilation (PIV) in Barnsbury

For a typical Barnsbury semi or terrace, a loft PIV unit is often the quickest way to dry the house out.

Customers in Barnsbury 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. Surveys for new installations are free on the UK mainland, with a written quote afterwards.

PIV in Barnsbury at a glance

Town: Barnsbury, Greater London
Postcode districts: N1, N1C and N7
Nearby: Islington (1 mile), King's Cross (1 mile) and Holloway (1 mile)
Price region: London
Survey: Free survey (UK mainland)

How we approach PIV in Barnsbury

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 Barnsbury

Positive input ventilation (PIV) guide prices in Barnsbury
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

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 Barnsbury

What is the price of a PIV unit in Barnsbury?

Guide prices for Barnsbury 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.

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.

Is the survey free in Barnsbury?

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 Barnsbury?

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 Barnsbury home has a loft and we can price a PIV unit before visiting.