Positive input ventilation (PIV) in West Sussex

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

Every job in West Sussex gets a written quote before it starts and a commissioning record when it finishes. We cover Horsham, Haywards Heath, Chichester, Burgess Hill and Crawley and the villages around them.

PIV in West Sussex at a glance

Area: West Sussex
Towns listed: 16, largest Crawley
Postcode districts: PO20, PO21, BN16, BN17, RH12 and RH13
Price region: South East
Survey: Free survey (UK mainland)

How we do it

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. It does not replace extract fans: kitchens and bathrooms still need their own extract to remove steam at source.

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.

Wall-mounted PIV for flats

Draws air from outside through an outside wall. Suits flats and homes with no loft space.

Guide prices in West Sussex

Positive input ventilation (PIV) guide prices in West Sussex
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.

Signs it is time to call us

Streaming windows on most mornings in winter
Black mould on window reveals and in corners of bedrooms
Musty smell in wardrobes or behind furniture

Rules 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.

How the job runs

Survey
Fixed quote
Install
Set up
Hand over

Towns we cover in West Sussex

Questions about positive input ventilation (PIV) in West Sussex

Which towns in West Sussex do you cover?

All of West Sussex, including Horsham, Haywards Heath, Chichester, Burgess Hill and Crawley. If your town is not listed, send the postcode and we will confirm.

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.

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.

Are prices different in West Sussex?

Our guide prices are adjusted by region. In West Sussex we use South East rates, so positive input ventilation (PIV) loft unit, supplied and fitted is typically £875 to £1,525 inc VAT per home.

Is the survey free in West Sussex?

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