Can you buy a house with BTC? Yes! All you need is a buyer with coins and a seller that will accept them. The value of the transaction is as of the date of the contract, when the coins change hands.
I think it is possible and it is actually a big advantage for us to buy properties using our earnings through bitcoins. There are companies who have just started to accept bitcoin as a mode of payment and to transact. Instead of paying straight to their bank accounts , they also believe that bitcoin is a faster and an easier way.
Right now, this thing is more likely to be an impossible sort of thing as there are not so many people and places which are willing to accept bitcoin as mode of payment and that is because of their own insecurities which they have. However, you can buy a house even if you are not getting it by giving away your bitcoins. In that case, you can go for buying a house by using your paper money or getting the paper money by selling your bitcoins first.