Positive input ventilation (PIV) in Merseyside

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

We carry out positive input ventilation (PIV) across Merseyside, including Huyton, Liverpool, Birkenhead, St Helens and Southport. Prices use North West rates. We survey first, free of charge for new installations on the mainland, then send a fixed written quote.

PIV in Merseyside at a glance

Area: Merseyside
Towns listed: 38, largest Liverpool
Postcode districts: L12, L15, L16, L34, L35 and L1
Price region: North West
Survey: Free survey (UK mainland)

How we do it

PIV works well in houses and flats with general condensation on windows and cold walls. It does not replace extract fans: kitchens and bathrooms still need their own extract to remove steam at source. On survey we check the loft, the landing position and the existing fans, and we tell you if PIV is not the right answer.

PIV with fan upgrades

PIV plus humidity-controlled extract fans in the kitchen and bathroom for the most stubborn condensation.

Loft-mounted PIV

The most common option for houses with a loft. Usually fitted in half a day.

Heated PIV

A heater module tempers the incoming air in cold weather. Useful in homes where people feel draughts.

Guide prices in Merseyside

Positive input ventilation (PIV) guide prices in Merseyside
Work	Guide price
Positive input ventilation (PIV) loft unit, supplied and fitted (per home)	£750–£1,325 inc VAT
Wall-mounted PIV unit for a flat (core drilled through an outside wall) (per flat)	£950–£1,600 inc VAT
Heater module or heated PIV unit (extra over a standard unit) (extra)	£140–£280 inc VAT

North West 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

Musty smell in wardrobes or behind furniture
The house feels stuffy and damp rather than cold
Washing dried indoors makes everything worse

Rules in England

English building work follows Approved Document F (2021 edition) for ventilation rates, installation and commissioning. It sets extract rates for kitchens, bathrooms and utilities and asks for mechanical ventilation to be commissioned and recorded.

How the job runs

Survey
Fixed quote
Install
Set up
Hand over

Towns we cover in Merseyside

Questions about positive input ventilation (PIV) in Merseyside

Which towns in Merseyside do you cover?

All of Merseyside, including Huyton, Liverpool, Birkenhead, St Helens and Southport. If your town is not listed, send the postcode and we will confirm.

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.

Are prices different in Merseyside?

Our guide prices are adjusted by region. In Merseyside we use North West rates, so positive input ventilation (PIV) loft unit, supplied and fitted is typically £750 to £1,325 inc VAT per home.

Is the survey free in Merseyside?

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.

Tell us whether your Merseyside home has a loft and we can price a PIV unit before visiting.