In Toronto today it would be in excess of 20%. To start with, it would be made up mostly of development charges and levy taxes, which in most municipalities today would make up between $60,000 and $70,000 directly paid by the builder. That's added to the price of the house. On top of that would be the permit fees and charges made during the development process, adding probably another $15,000 to $20,000 and then on top of that there's the final HST figure, which is tax on the tax. In those cases that could be upwards of $100,000.
On September 28th, 2016. See this statement in context.