Egress Window Check
Last updated
A basement egress window likely passes when its clear opening is at least 5.7 sq ft, 24 in. high and 20 in. wide, its sill is no higher than 44 in., and its well is at least 9 sq ft with 36 in. projection and width.
Measure the clear opening of your basement window when it is fully open, not the frame. Enter the numbers below to see whether the window and well likely meet the base IRC egress minimums. This is a quick screen, not a code ruling.
Check your window
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What the check uses
- Net clear opening of at least 5.7 sq ft, at least 24 in. high and 20 in. wide.
- Sill no higher than 44 in. above the floor.
- A window well of at least 9 sq ft, with projection and width each at least 36 in.
- A ladder or steps when the well is deeper than 44 in.
Your city or county may amend these rules. Read the egress code guide and the permit guide, then get a free quote below.
Frequently asked questions
How do I measure an egress window opening?
Open the window fully and measure the clear opening inside the frame: the height and width a person could climb through. Multiply them and divide by 144 to get square feet.
Is this check a code approval?
No. It is a quick screen against base IRC minimums. Your city or county may amend the rules, so check with your building department.