Positive input ventilation (PIV) in Northamptonshire

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

Our team is based in Great Barr, Birmingham, and we work throughout Northamptonshire, from Kettering, Wellingborough, Rushden, Daventry and Brackley. The survey is free for new installations on the UK mainland, and the quote that follows is fixed and in writing.

PIV in Northamptonshire at a glance

Area: Northamptonshire
Towns listed: 8, largest Northampton
Postcode districts: NN14, NN15, NN8, NN10, NN9 and NN10
Price region: East Midlands
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.

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.

PIV with fan upgrades

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

Guide prices in Northamptonshire

Positive input ventilation (PIV) guide prices in Northamptonshire
Work	Guide price
Positive input ventilation (PIV) loft unit, supplied and fitted (per home)	£775–£1,375 inc VAT
Wall-mounted PIV unit for a flat (core drilled through an outside wall) (per flat)	£975–£1,650 inc VAT
Heater module or heated PIV unit (extra over a standard unit) (extra)	£140–£290 inc VAT

Guide prices using East Midlands 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

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

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 Northamptonshire

Questions about positive input ventilation (PIV) in Northamptonshire

Which rules apply to ventilation in Northamptonshire?

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.

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.

Which towns in Northamptonshire do you cover?

All of Northamptonshire, including Kettering, Wellingborough, Rushden, Daventry and Brackley. If your town is not listed, send the postcode and we will confirm.

Are prices different in Northamptonshire?

Our guide prices are adjusted by region. In Northamptonshire we use East Midlands rates, so positive input ventilation (PIV) loft unit, supplied and fitted is typically £775 to £1,375 inc VAT per home.

Get a PIV guide price for your Northamptonshire home online, then confirm it on a free survey.