Positive input ventilation (PIV) in Berkshire

PIV is often a good fix for Berkshire homes with condensation on every window.

We carry out positive input ventilation (PIV) across Berkshire, including Bracknell, Maidenhead, Wokingham, Newbury and Lower Earley. Prices use South East rates. The survey is free for new installations on the UK mainland, and the quote that follows is fixed and in writing.

PIV in Berkshire at a glance

Area: Berkshire
Towns listed: 14, largest Reading
Postcode districts: SL1, SL3, GU47, RG40, RG14 and RG18
Price region: South East
Survey: Free survey (UK mainland)

What positive input ventilation (PIV) involves

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.

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.

Loft-mounted PIV

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

Guide prices in Berkshire

Positive input ventilation (PIV) guide prices in Berkshire
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

Guide prices using South East rates. Prices include VAT at 20%. A guide price is not a quote: we confirm a fixed price in writing first.

Signs it is time to call us

Washing dried indoors makes everything worse
You have no loft but still need whole-flat ventilation (wall unit)
Streaming windows on most mornings in winter

Rules in England

In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). 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 Berkshire

Questions about positive input ventilation (PIV) in Berkshire

Which towns in Berkshire do you cover?

All of Berkshire, including Bracknell, Maidenhead, Wokingham, Newbury and Lower Earley. If your town is not listed, send the postcode and we will confirm.

How much does PIV cost to install?

A loft-mounted PIV unit usually costs £795 to £1,395 including VAT supplied and fitted, and £995 to £1,695 for a wall-mounted unit in a flat. A heater module adds around £145 to £295.

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.

Are prices different in Berkshire?

Our guide prices are adjusted by region. In Berkshire 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 Berkshire?

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.

We will check the existing fans in your Berkshire home at the same visit, because PIV works best with them working.