About 170,000 rental properties across the country need to be insulated to meet the Residential Tenancies Act and the clock is ticking.
"The urgency to insulate has not yet been realised by rental property owners," says Barfoot & Thompson director Kiri Barfoot.
Landlords have until July 2019 to insulate their rentals, which seems a long way off - but not if everyone leaves it until the last minute.
"The situation is reaching the point of no return, where insulation installers won't be able to meet demand," Barfoot says.
She says 170,000 homes don't have any, or the required level of insulation, and Auckland and Northland account for about a third of those (60,000).