Positive input ventilation (PIV) in Witney

We fit loft and wall-mounted PIV units across Witney, after checking the house first.

Witney is about 56 miles from our base in Great Barr, Birmingham. We book Witney visits by appointment and confirm the date in writing. We survey first, free of charge for new installations on the mainland, then send a fixed written quote.

PIV in Witney at a glance

Town: Witney, Oxfordshire
Postcode districts: OX8, OX28 and OX29
Nearby: Carterton (5 miles), Kidlington (9 miles) and Oxford (10 miles)
Price region: South East
Survey: Free survey (UK mainland)

What the work involves

Loft air is usually a little warmer and drier than outside air, and the unit filters it before it comes down into the house. 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.

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 Witney

Positive input ventilation (PIV) guide prices in Witney
Work	Guide price
Positive input ventilation (PIV) loft unit, supplied and fitted (per home)	£875–£1,525 inc VAT
Wall-mounted PIV unit for a flat (core drilled through an outside wall) (per flat)	£1,100–£1,875 inc VAT
Heater module or heated PIV unit (extra over a standard unit) (extra)	£160–£325 inc VAT

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

Common reasons people call

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 Witney

What is the price of a PIV unit in Witney?

Guide prices for Witney use South East rates: positive input ventilation (PIV) loft unit, supplied and fitted is typically £875 to £1,525 inc VAT per home. We confirm a fixed price in writing before any work starts.

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.

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.

Is the survey free in Witney?

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 Witney?

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