If you buy a house directly with Bitcoin, you will still need to pay taxes. You will need to report your Bitcoins to the IRS or whatever your country has, because you can't hide a house.. they will find you have a house sooner or later. So before you think about it, consider the % of Bitcoin that will go to taxes first, because maybe you don't have enough to buy it.
Still it is better to pay this taxes, than to lose everything. It is good that bitcoin is a live, as all network technology, but if something goes wrong with it, you will just lose it. Always better to convert money in things like flats or houses, it will give much more profit and stability,than bitcoin.