Housing problems here are related to
pricing, and only tangentially to quantity of construction. The issue is how cheap housing loans have been, how deregulated the real estate sales market, and how stupid the last 20 years of governments have been about a) how they regulate the housing market and b) what kind of housing gets built (mostly either sprawly suburban single family mc-homes way out in e.g. Vaughan or Mississauga etc. or tiny condos in Toronto proper which just get turned into speculative investments or airbnbs).
Mortgages here were too cheap for too long. Really, what people "buy" when they buy a home is a mortgage, not a house.