Basement Egress Windows in Calgary: What You Need to Know

If you're developing a basement bedroom in Calgary — whether for your own family or as a rental suite — an egress window is not optional. It's a legal requirement under the Alberta Building Code, and it's one of the first things an inspector will check.

Here's everything you need to know before your project starts.

What Is an Egress Window?

An egress window is a window large enough to serve as an emergency exit. The purpose is simple: if a fire blocks the staircase, a person in a basement bedroom needs another way out — and emergency responders need a way in.

Every basement space with a sleeping room needs two means of egress to get out in the event of an emergency. In basements, the easiest way to achieve this second means of exit is through a window that complies with the building code.

Calgary's Egress Window Requirements

Calgary follows the National Building Code — Alberta Edition (NBC AE). Here are the non-negotiable minimums:

Minimum opening size: The window must provide an unobstructed opening with a minimum area of 0.35 sq. m. (3.77 sq. ft.) with no dimension less than 380 mm (15 inches).

Window well clearance: The well must extend 760 mm (2'6") beyond the fully open window for an out-swinging window, or beyond the wall for an in-swinging window.

Sill height: The bottom of the window must be no more than 1 meter above the floor or ground — though this can be managed with a permanent step or bench.

Operation: The window must open from the inside without tools, keys, or special knowledge.

Additional Calgary-specific rules: You cannot install egress windows underneath decks unless there is 2.1 meters of head clearance. To comply with a city permit, you cannot cut out more than 25% of the total wall length. You also need at least 1.2 meters clearance on one side of the home for the fire department, and 6 inches of drainage rock in the well.

Deep window wells: Window wells deeper than 44 inches require a permanent ladder or steps to facilitate emergency exit.

Do You Need a Permit?

Yes — always.

Calgary requires a mandatory building permit for basement egress window installations, with fees starting at $333.84 for new installations. You'll need to submit elevation drawings showing the window size and location relative to the foundation and property lines.

Most egress window installers will pull the permit for you as part of the job. If they don't offer this, ask about it directly.

What Window Types Work for Egress?

Not every window style qualifies. Casement windows are hinged on the side and swing outward, offering the full window opening for easy exit. Sliding windows glide horizontally and are a good choice for basements where an outward-opening window would be impractical.

Awning windows — hinged at the top and opening outward from the bottom — are generally not suitable for egress because the opening mechanism obstructs the exit path.

For Calgary's climate, high-quality vinyl is an excellent material choice — it offers superior insulation, is incredibly durable, and requires virtually no maintenance.

How Much Does Egress Window Installation Cost in Calgary?

This is where Calgary differs from most other cities. The cost is higher here because of the clay soil conditions and concrete foundation work involved.

Egress window installation in Calgary typically costs $3,500–$8,000 per window, including the window cut, window well, drainage, and finishing work. For poured concrete foundations, expect to pay $4,000–$6,500 per window. Concrete block foundations may cost slightly less at $3,500–$5,500. If your home sits on Calgary's expansive clay soils or requires extensive excavation through rock or utilities, costs can reach $7,000–$8,000 per window.

What's typically included:

• Concrete cutting and foundation opening
• Window and frame installation
• Excavation and window well installation with drainage
• Permit (with most contractors)
• Interior and exterior finishing

Calgary's 4+ foot frost line means extensive excavation, and the expansive clay soils require careful attention to drainage and backfill materials. Poor drainage around basement windows is a leading cause of foundation water issues in Calgary.

Older Calgary Homes: What to Expect

Many homes built before the mid-1980s have basement windows that are too small to meet today's egress requirements. This is extremely common — and it's something we see on almost every older basement development we work on.

Legal basement bedrooms require egress windows and 30" window wells. Most Calgary houses built in 2016 or earlier will not have the required 30" wells on basement windows, and older homes may not have egress windows at all.

If you're developing a basement in an older home, budget for at least one egress window upgrade as part of your project. Skipping it means the bedroom can't be legally called a bedroom — and it won't pass inspection.

Why This Matters for Your Drywall and Framing

This is where DryBuild comes in. Egress windows directly affect our work.

The framing inspection — which happens before any drywall goes up — is when the inspector verifies egress compliance. If the egress window isn't installed and compliant at that point, the inspection fails and drywall cannot proceed.

We coordinate our framing and boarding schedule around permit inspections. On every basement project we work on, we confirm egress window status before we start boarding walls — so there's no situation where drywall has to come down because an inspection was missed.

If you're planning a basement development and aren't sure if your existing windows meet code, get that confirmed before any other work begins. It's a much cheaper conversation to have at the planning stage than mid-project.

Questions? Give Mike a call — he'll walk through your basement and flag anything that needs to be sorted before work starts.

📞 (825) 747-0464