How high can an egress window sill be above the floor?
The egress window sill can be no more than 44 in above the finished floor (IRC R310.2.2).
When a window serves as the emergency escape and rescue opening, the bottom of the clear opening (the sill) must sit no higher than 44 inches above the finished floor, so an occupant can reach it and climb out.
If the sill is below the outside grade — common in basements — a compliant window well is required so the window can open fully and someone can climb out.
Verified against
Related answers
Need this scoped to your jurisdiction?
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.