Cure condensation and black mould permanently in your North West home — fixed prices from £749, fully installed
Derry / Londonderry sits on the banks of the River Foyle, and the city's mix of older Cityside terraces, Waterside homes and outlying estates regularly battles high humidity, condensation and persistent black mould — particularly through the long, wet North West winters.
We install positive input ventilation (PIV) throughout Derry / Londonderry and the BT47 and BT48 postcodes, covering the Cityside, the Waterside, Culmore, Strathfoyle, Newbuildings and the surrounding villages. Whether it's a period terrace or a modern estate home, PIV is the proven permanent fix.
One quiet unit, fitted in around two hours, gently floods the whole home with fresh filtered air and pushes the damp out. Most North West customers see windows running dry within a week.
Book a Free North West Survey →Clears streaming windows driven by Foyle-side humidity and long wet winters.
Holds humidity below the threshold mould needs, so it stops returning for good.
Around £10–£15 a year — quieter and cheaper than running dehumidifiers.
We install PIV across the North West, including:
"Every winter our Waterside house had black mould creeping up the bedroom walls no matter how often we cleaned it. Since the PIV unit went in, the walls are clean and the air feels so much fresher. Wish we'd done it years ago."
Get your fixed online price today. Most properties surveyed and installed within 5 business days.