Positive input ventilation (PIV) in Swanley

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

For positive input ventilation (PIV) in Swanley, send us the postcode, a few photos and a rough idea of the rooms involved. We will tell you what we would fit and roughly what it costs before arranging a visit.

PIV in Swanley at a glance

Town: Swanley, Kent
Postcode districts: BR5, BR8 and DA4
Nearby: Bexley (3 miles), Chelsfield (3 miles) and Orpington (4 miles)
Price region: South East
Survey: Free survey (UK mainland)

What the work involves

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.

Guide prices in Swanley

Positive input ventilation (PIV) guide prices in Swanley
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.

When to get it looked at

Musty smell in wardrobes or behind furniture
The house feels stuffy and damp rather than cold
Washing dried indoors makes everything worse

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 Swanley

What area around Swanley do you work in?

All of Kent. Near Swanley that includes Bexley, Chelsfield, Orpington and Sidcup.

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.

Do you cover Swanley and nearby?

Yes. We cover Swanley and nearby places including Bexley, Chelsfield, Orpington and Sidcup. Send your postcode and we will confirm.

What is the price of a PIV unit in Swanley?

Guide prices for Swanley use South East rates: positive input ventilation (PIV) loft unit, supplied and fitted is typically £875 to £1,525 inc VAT per home. We confirm a fixed price in writing before any work starts.

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