For many Canadians, finding ways to improve their home's energy efficiency is an ongoing project. They can upgrade their insulation, seal leaky windows and doors, and add heat pumps or solar panels. It's enough to make some people wish all that work had been done when the home was built in the first place. But even now, very few homes are constructed to Net Zero standards. CBC's Blair Sanderson has this look at what's standing in the way of the federal government's own Net Zero goals in new housing developments.