Positive input ventilation (PIV) in Gloucestershire

If your Gloucestershire flat has no loft, a wall-mounted PIV unit does the same job through an outside wall.

If you are anywhere in Gloucestershire, send the postcode and a few photos and we will tell you what we would recommend. Towns we cover include Kingswood, Mangotsfield, Yate, Tewkesbury and Cirencester.

PIV in Gloucestershire at a glance

Area: Gloucestershire
Towns listed: 15, largest Gloucester
Postcode districts: BS16, BS5, BS15, BS36, BS37 and GL20
Price region: South West
Survey: Free survey (UK mainland)

What positive input ventilation (PIV) 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. PIV works well in houses and flats with general condensation on windows and cold walls.

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 Gloucestershire

Positive input ventilation (PIV) guide prices in Gloucestershire
Work	Guide price
Positive input ventilation (PIV) loft unit, supplied and fitted (per home)	£825–£1,450 inc VAT
Wall-mounted PIV unit for a flat (core drilled through an outside wall) (per flat)	£1,025–£1,775 inc VAT
Heater module or heated PIV unit (extra over a standard unit) (extra)	£150–£305 inc VAT

Guide prices using South West 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

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 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 Gloucestershire

Questions about positive input ventilation (PIV) in Gloucestershire

Which rules apply to ventilation in Gloucestershire?

In England, ventilation in new and altered homes is covered by Approved Document F of the Building Regulations. Landlords also have duties under the Housing Health and Safety Rating System, and workplaces must be ventilated under the Workplace (Health, Safety and Welfare) Regulations 1992.

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.

Which towns in Gloucestershire do you cover?

All of Gloucestershire, including Kingswood, Mangotsfield, Yate, Tewkesbury and Cirencester. If your town is not listed, send the postcode and we will confirm.

Are prices different in Gloucestershire?

Our guide prices are adjusted by region. In Gloucestershire we use South West rates, so positive input ventilation (PIV) loft unit, supplied and fitted is typically £825 to £1,450 inc VAT per home.

Book a free Gloucestershire survey and we will say honestly whether PIV, extract fans or both are needed.