Positive input ventilation (PIV) in County Down

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

If you are anywhere in County Down, send the postcode and a few photos and we will tell you what we would recommend. Towns we cover include Dundonald, Holywood, Downpatrick, Bangor and Castlereagh.

PIV in County Down at a glance

Area: County Down, Northern Ireland
Towns listed: 8, largest Bangor
Postcode districts: BT3, BT4, BT30, BT19, BT20 and BT5
Price region: Northern Ireland
Survey: By arrangement, travel quoted first

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. Flats without a loft use a wall-mounted unit that draws air from outside through a cored hole.

Loft-mounted PIV

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

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 County Down

Positive input ventilation (PIV) guide prices in County Down
Work	Guide price
Positive input ventilation (PIV) loft unit, supplied and fitted (per home)	£725–£1,275 inc VAT
Wall-mounted PIV unit for a flat (core drilled through an outside wall) (per flat)	£925–£1,550 inc VAT
Heater module or heated PIV unit (extra over a standard unit) (extra)	£135–£270 inc VAT

These ranges use our Northern Ireland rates. Prices include VAT at 20%. You get a fixed written price before any work is booked. Travel is quoted separately for this area.

Common reasons people call

Streaming windows on most mornings in winter
Black mould on window reveals and in corners of bedrooms
Musty smell in wardrobes or behind furniture

Rules in Northern Ireland

Northern Ireland has its own building regulations, with ventilation guidance in Technical Booklet K. We design to the Northern Ireland guidance and measure the airflow achieved.

How the job runs

Survey
Fixed quote
Install
Set up
Hand over

Towns we cover in County Down

Questions about positive input ventilation (PIV) in County Down

Is the survey free in County Down?

Visits here are by arrangement. Because of the ferry or long travel involved, we quote travel separately and in writing before you commit, and we can often combine visits to keep the cost down.

Will PIV make my house cold?

Most units temper or reduce the flow when the incoming air is cold, and a heated unit warms it. Placed correctly on the landing, the air spreads gently rather than blowing on anyone.

Can PIV be fitted in a flat?

Yes. Flats without loft space use a wall-mounted PIV unit that draws air from outside through an outside wall.

Which rules apply to ventilation in County Down?

In Northern Ireland, ventilation is covered by Technical Booklet K of the Building Regulations (Northern Ireland). Workplaces must be ventilated under the Workplace (Health, Safety and Welfare) Regulations (Northern Ireland) 1993.

Which towns in County Down do you cover?

All of County Down, including Dundonald, Holywood, Downpatrick, Bangor and Castlereagh. If your town is not listed, send the postcode and we will confirm.