User blog comment:Mathmagician/Patch 1.1 - Testing NPC Housing/@comment-71.200.121.179-20111215140911/@comment-2209189-20111215153313

^logged in. To elaborate, this is the same as old houses with the doors barred from being opened by placing a block on either side (as is useful during blood moons); the entrance is not usable, but the game still counts it.