7. A room is considered as a place bigger than 4 square meters with door and window, and used for daily residence or sleeping. Consulting rooms, offices, workshops, etc., as well as a hall and a dining-room with a window are also considered as rooms. Places joining rooms through a hatch without door (e.g. alcove, dining-box) must not be considered as a separate room, it should be counted in together with a room or kitchen instead.