Positive input ventilation (PIV) in Thorne

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

Customers in Thorne can get a guide price online in a couple of minutes. It uses Yorkshire rates, which is what we would charge for the same job anywhere in South Yorkshire. Surveys for new installations are free on the UK mainland, with a written quote afterwards.

PIV in Thorne at a glance

Town: Thorne, South Yorkshire
Postcode districts: DN3, DN7 and DN8
Nearby: Kirk Sandall (6 miles), Armthorpe (6 miles) and Goole (7 miles)
Price region: Yorkshire
Survey: Free survey (UK mainland)

How we approach PIV in Thorne

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 Thorne

Positive input ventilation (PIV) guide prices in Thorne
Work	Guide price
Positive input ventilation (PIV) loft unit, supplied and fitted (per home)	£750–£1,300 inc VAT
Wall-mounted PIV unit for a flat (core drilled through an outside wall) (per flat)	£925–£1,600 inc VAT
Heater module or heated PIV unit (extra over a standard unit) (extra)	£135–£275 inc VAT

Yorkshire rates shown. Prices include VAT at 20%. The fixed price is confirmed in writing after we have seen the job.

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 Thorne

What is the price of a PIV unit in Thorne?

Guide prices for Thorne use Yorkshire rates: positive input ventilation (PIV) loft unit, supplied and fitted is typically £750 to £1,300 inc VAT per home. We confirm a fixed price in writing before any work starts.

How much does PIV cost to install?

A loft-mounted PIV unit usually costs £795 to £1,395 including VAT supplied and fitted, and £995 to £1,695 for a wall-mounted unit in a flat. A heater module adds around £145 to £295.

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.

Is the survey free in Thorne?

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 Thorne?

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.

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