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.
to buy bitcoin using bitcoin is likely to happen but you have to find a seller who can accept bitcoin for his payment method because currently there are few who accept bitcoin as a legitimate payment.
Not very hard now, as everyone want bitcoin now and it is quite easy to get a house as bitcoin payment, as one of my friend told me he has more than one house and he want to sell it for making investment in bitcoin, so I was holding bitcoin but was not having any personal house so we made a deal I give him 10% of my bitcoin and he has given his extra house as an investment so he is happy that he has profitable currency and I am happy I have my house so thanks to bitcoin for blessing me with my house.