In version 1.26 and above:
The first room of the house is the Cozy room and this will be unlocked at level 6.
The second room of the house is the Crafty room and this will be unlocked at level 12.
The third room of the house is the Library room and this will be unlocked at level 16.
The fourth room of the house is the Witchy room and this is available for purchase in our in-game shop.