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A Quick Guide to Basement Escape Windows + NBC Code Breakdown
- nanyihenriquez
- Jun 2
- 2 min read
👋 Hey there builder fam!
Today we’re diving into a topic that literally could save your life — Egress Windows in basements. If you’re developing a basement bedroom, suite, or even just finishing a space, you NEED to know this. Let's break it down 👇
🧠 What is an Egress Window?
An egress window is not just a regular window. It’s a legal and safe exit in case of an emergency — think fire, smoke, or anything that blocks your basement stairs.
Basically, if someone’s sleeping in a basement, they need to be able to escape without a ladder or a superhero.
📏 Minimum Egress Window Requirements (NBC 2020)
According to the National Building Code of Canada (NBC 2020, Section 9.9.10.1):
➡️ Minimum unobstructed opening:0.35 m² (3.77 ft²)➡️ Minimum dimension in any direction:380 mm (15 inches)
✅ That’s clear opening — not the total size of the window, but the space you can actually climb through once it’s open.⚠️ Window wells must provide 760 mm (30") clear space in front of the window.
💡 Why Does it Matter?
✔️ Safety – It’s a life-saving feature.
✔️ Code Compliance – No egress = no permit approval for basement bedrooms.
✔️ Resale Value – Future buyers (and their inspectors) will ask for it.
✔️ Insurance – Some policies require it for coverage on basement bedrooms.
🛠️ Tips to Make It Easy:
Look for casement windows that fully swing open — they meet egress sizing more easily.
Don’t forget window well clearance if your basement is fully below grade.
Use a ladder or step if the window is high up inside — accessibility matters too!
📚 NBC Reference:
National Building Code of Canada 2020 – Division B, Part 9 – Section 9.9.10.1(You can find this under “Means of Egress” and “Windows as Exits”)
If you're finishing a basement and planning a bedroom, you NEED an egress window.
No shortcuts. No excuses. Just do it right — safe, smart, and code-approved. 👷♀️✔️
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