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.
Buying a house using bitcoins is possible because of the ico's today that are running different campaigns with a concept of real estate, there is a lot of progress in this kind of business and i am sure that you can purchase a house using bitcoins.