Positive input ventilation (PIV) in Wembley

For a typical Wembley semi or terrace, a loft PIV unit is often the quickest way to dry the house out.

Wembley is about 97 miles from our base in Great Barr, Birmingham. We book Wembley visits by appointment and confirm the date in writing. Surveys for new installations are free on the UK mainland, with a written quote afterwards.

PIV in Wembley at a glance

Town: Wembley, Greater London
Postcode districts: HA0, HA9 and UB6
Nearby: Brent (under a mile), Sudbury (1 mile) and Harrow on the Hill (2 miles)
Price region: London
Survey: Free survey (UK mainland)

PIV for Wembley homes

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.

Guide prices in Wembley

Positive input ventilation (PIV) guide prices in Wembley
Work	Guide price
Positive input ventilation (PIV) loft unit, supplied and fitted (per home)	£950–£1,675 inc VAT
Wall-mounted PIV unit for a flat (core drilled through an outside wall) (per flat)	£1,200–£2,025 inc VAT
Heater module or heated PIV unit (extra over a standard unit) (extra)	£175–£355 inc VAT

London rates shown. Prices include VAT at 20%. The fixed price is confirmed in writing after we have seen the job.

When to get it looked at

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 that apply in England

English building work follows Approved Document F (2021 edition) for ventilation rates, installation and commissioning. 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.

Questions from Wembley

Do you cover Wembley and nearby?

Yes. We cover Wembley and nearby places including Brent, Sudbury, Harrow on the Hill and Harlesden. Send your 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.

What is the price of a PIV unit in Wembley?

Guide prices for Wembley use London rates: positive input ventilation (PIV) loft unit, supplied and fitted is typically £950 to £1,675 inc VAT per home. We confirm a fixed price in writing before any work starts.

Is the survey free in Wembley?

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 Wembley home at the same visit, because PIV works best with them working.