What are Calgary's egress window requirements for finished basements?

Every basement bedroom in Calgary must have an egress window that meets Alberta Building Code minimums, and this is a non-negotiable life-safety requirement that Safety Codes Officers will inspect before signing off on your basement development permit. The requirements are straightforward but specific, and failing to meet them means a room cannot legally be classified as a bedroom — which affects your home's value, your insurance coverage, and most importantly, the safety of anyone sleeping in that space.

The Alberta Building Code requires each basement bedroom egress window to provide a minimum unobstructed opening of 3.77 square feet (0.35 square metres), with a minimum width of 15 inches (380 mm) in any direction. The window sill cannot be higher than 39 inches (1,000 mm) from the finished floor, ensuring that occupants — including children — can reach and climb through the opening in an emergency. The window must open fully without tools, keys, or special knowledge, and it must stay open on its own without being held. Casement and slider-style windows are the most common types used to meet these requirements in Calgary basements.

Beyond the window itself, the window well is part of the egress system. If the window opens into a window well (as most basement egress windows do), the well must be large enough to allow a person to escape and a firefighter in full gear to enter. The minimum window well dimensions are typically 36 inches wide and project at least 36 inches from the foundation wall. If the window well is deeper than 44 inches, a permanently attached ladder or steps are required. In Calgary, window wells must also be designed to handle our unique drainage challenges — spring snowmelt and chinook-driven rapid thaws can fill poorly drained window wells with water, creating both a flooding risk and defeating the purpose of emergency egress.

Installing an egress window in an existing Calgary basement involves cutting an opening in the foundation wall, which is structural work requiring a building permit and typically a structural engineer's input to ensure the opening doesn't compromise wall integrity. Calgary pricing for egress window installation runs $2,500 to $6,000 per window including cutting the foundation, installing the window and frame, excavating and installing the window well, and ensuring proper drainage. The cost varies based on foundation type (poured concrete versus block), soil conditions (our bentonite clay makes excavation more challenging), and accessibility.

Don't overlook egress requirements during your planning phase. Some homeowners design their entire basement layout only to discover that adding egress windows requires rearranging everything due to exterior obstacles like decks, walkways, gas lines, or lot grading constraints. Work with your contractor to confirm egress window locations before finalizing your floor plan. Browse basement renovation contractors through the Calgary Construction Network directory to find professionals experienced with egress installations in your neighbourhood.