What size egress window does a bedroom need?
Min 5.7 sq ft net opening (5.0 sq ft at grade), 24 in min height, 20 in min width, sill ≤ 44 in (IRC R310).
Every sleeping room needs an emergency escape and rescue opening. The minimum net clear opening is 5.7 square feet (5.0 sq ft for openings at grade level).
The minimum net clear opening height is 24 inches and the minimum width is 20 inches, with the sill no higher than 44 inches above the floor.
Related answers
- Does a basement or basement bedroom need an egress window? — IRC §R310.1
- How high can an egress window sill be above the floor? — IRC §R310.2.2
- What size does an egress window well need to be? — IRC §R310.2.3
- When does an egress window well need a ladder or steps? — IRC §R310.2.3.1
- How high does a window sill have to be above the floor to meet fall-protection rules? — IRC §R312.2.1
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Adopted edition and local amendments vary by city and county. Ask Donnie checks your jurisdiction and cites the exact adopted section.
Ask Donnie →General information based on the International Residential Code (a model code). This is AI assistance to verify — not legal advice. Confirm the adopted edition and any local amendments with your local building department (AHJ) and a licensed professional before you build.