What are the window requirements for a legal basement apartment?

Legal basement apartments in Ottawa must meet specific window requirements for egress (emergency exit) and natural light. The Ontario Building Code requires at least one window in each bedroom that can serve as an emergency exit, plus windows for natural light in living areas.

Egress window requirements are the most critical for basement apartments. Each bedroom must have a window with a minimum opening area of 0.35 square meters (about 3.8 square feet) and no dimension less than 380mm (15 inches). The window sill cannot be more than 1.5 meters (about 5 feet) above the floor. These windows must open directly to the exterior or to a window well that meets specific size requirements - typically at least 760mm (30 inches) wide and projecting at least 760mm from the foundation wall.

Natural light requirements mandate that habitable rooms have window area equal to at least 5% of the floor area, with half of that being openable for ventilation. This means a 100 square foot bedroom needs at least 5 square feet of window area. Living rooms, kitchens, and bedrooms all need natural light, though bathrooms and storage areas don't.

Window wells are often necessary for basement egress windows and must be properly sized, waterproofed, and drained. The well needs a clear opening width of at least 760mm and must project far enough from the wall to allow the window to fully open. Proper drainage and waterproofing are essential to prevent water infiltration.

In Ottawa's climate, basement windows should be energy efficient with good insulation properties. Triple-pane windows with low-E coatings help prevent condensation issues common in below-grade installations. Proper installation with adequate air sealing and moisture barriers is crucial.

City of Ottawa requirements may vary for specific situations - confirm egress and natural light requirements with Ottawa Building Services before finalizing your basement apartment plans. A building permit is typically required for basement apartment conversions, and window modifications are part of that approval process.

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