Positive input ventilation (PIV) in Dover

Condensation in Dover homes usually has one of two answers: better extract fans, or PIV as well.

We cover Dover and the surrounding CT14, CT16 and CT17 postcodes as part of our work across Kent. Surveys for new installations are free on the UK mainland, with a written quote afterwards.

PIV in Dover at a glance

Town: Dover, Kent
Postcode districts: CT14, CT16 and CT17
Nearby: Folkestone (7 miles), Deal (8 miles) and Hythe (11 miles)
Price region: South East
Survey: Free survey (UK mainland)

What the work involves

Loft air is usually a little warmer and drier than outside air, and the unit filters it before it comes down into the house. Many units have a temperature sensor that reduces the flow or switches to a heater module on cold days, so the incoming air does not feel like a draught.

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 Dover

Positive input ventilation (PIV) guide prices in Dover
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

These ranges use our South East rates. Prices include VAT at 20%. You get a fixed written price before any work is booked.

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

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.

Questions from Dover

Do you cover Dover and nearby?

Yes. We cover Dover and nearby places including Folkestone, Deal, Hythe and Canterbury. 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 Dover?

Guide prices for Dover 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.

Is the survey free in Dover?

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