Positive input ventilation (PIV) in Somerset

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

If you are anywhere in Somerset, send the postcode and a few photos and we will tell you what we would recommend. Towns we cover include Burnham-on-Sea, Bath, Weston-super-Mare, Taunton and Yeovil.

PIV in Somerset at a glance

Area: Somerset
Towns listed: 19, largest Bath
Postcode districts: BS21, BS48, BS20, BS21, BS14 and BS30
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 Somerset

Positive input ventilation (PIV) guide prices in Somerset
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.

Common reasons people call

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 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 Somerset

Questions about positive input ventilation (PIV) in Somerset

Are prices different in Somerset?

Our guide prices are adjusted by region. In Somerset 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.

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 Somerset?

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.

Which rules apply to ventilation in Somerset?

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.

Send a photo of your loft hatch area and landing ceiling for a quicker Somerset quote.