[pcthrowaway]

How do you build 600,000 houses a year with a population of 40 million? Cancel all other jobs and redirect all labor in Canada to building housing?

I'd be very surprised there are "220-250K housing starts per year" really. A lot of that might be development in the planning stage that is tied up in red tape whether it be in the investment stage, or navigating bureaucracy. I'd be very surprised if there were 100K houses per year actually being built.

edit: Does "housing starts" here refer to bedrooms? E.g. a 3 bedroom house counts as 3 housing starts? If so, the 600K goal (required to keep up with population growth) is much more reasonable, though still far off.