Minecraft wiki entry for Legacy_village_mechanics, associated text: Then since the initial check failed, the bottom layer is ignored, and we perform the test again, this time checking for roof blocks only above (not level with) the green wool. This time, only the two spaces on the left-hand side of the image are covered. Since the "roof check" passed on this second try, the door counts as a house, and its "inside" is on the left where the more covered spaces are: