Ottawa By-law 2013-416, s. 35 — Property Standards By-law

1) In every dwelling unit, BY-LAW NO. 2013-416

• a) bedrooms shall have a window or windows, skylights or translucent panels which face directly to the outside with an unobstructed light transmitting area of not less than five percent (5%) of the area of such rooms;
• b) other habitable rooms not located in a basement and excluding kitchens shall have a window or windows, skylights or translucent panels which face directly to the outside with an unobstructed light transmitting area of not less than ten percent (10%) of the floor area of such rooms; and
• c) the glass area of a sash door may be considered as a portion of the required window area. 2) Whenever walls or other portions of structures are facing and located less than 91 cm (3 ft.) from a window, such a window shall not be,
• a) deemed to face directly to the outside; and
• b) included as contributing to the required minimum window area of the room. 3) Whenever window wells are used, only that part of the window, which is above a forty- five (45) degree line projected downwards from the top of the window well, shall be used in calculating the required light transmitting area. 4) Artificial light capable of maintaining the minimum level of illumination, as prescribed by the Building Code, shall be provided at all times. VENTILATION