There seems to be some confusion as to how HST affects Real Estate transactions. If you are purchasing a re-sale property, a house that is not newly built, then you don't have to pay HST on the purchase price of the home. The HST you will have to pay is on the services like legal fees, Real Esate Agents commission etc.
Now this story changes if your buying a new home, yes there is HST but there are rebates and a lot of other complicated stuff involved and I would suggest researching into it if that is the case.