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The Ontario Building Code specifies regulations regarding the dimensions, functionality, and type of egress windows.

1. Operability: Egress windows should be easily operable from the inside without the need for keys, tools, or specialized knowledge.
2. Unobstructed Opening: Egress windows must feature an unobstructed opening with a minimum size of 3.8 square feet, approximately equivalent to a 30” x 30” brick opening. This measurement pertains to the size of the opening itself, not merely the area covered by glass or the window. The window must also be capable of maintaining this opening size without requiring additional support.
3. Dimensional Requirement: Egress windows should not have any dimension that is less than 15 inches.
4. Window Wells: In the case of basement windows, a window well is often necessary. The well must extend from the window by a minimum of 22 inches to provide a means of egress to the exterior.

When you're in the process of converting your basement into a secondary suite, you might hear the term "escape window" from your architect or engineer. These windows differ from standard ones in several key aspects:

1. Minimum Openable Size: Escape windows must feature an openable portion that measures at least 4.1 square feet, approximately equivalent to a 31 x 31-inch brick opening.
2. Dimensional Requirement: There should be no dimension of the window less than 18 inches.
3. Sill Height: The window sill's height should not exceed 35 inches from the floor below. This requirement can be met by using steps or fixed furniture.
4. Window Well Projection: Escape windows must open into a window well with a projection of no less than 39 inches.