Building code requires egress windows for one reason: so people do not die in basement fires. Every rule below exists because someone could not get out, or a firefighter could not get in. This is not bureaucracy — it is the minimum for a bedroom to be a bedroom.
What the code actually requires
Most of the U.S., including Ohio, bases residential egress code on Section R310 of the International Residential Code (IRC). Here are the numbers that matter:
- Minimum clear opening: 5.7 square feet. This is the actual open space you can climb through — not the window’s overall size. (At ground level, 5.0 square feet is allowed.)
- Minimum opening height: 24 inches of clear vertical space.
- Minimum opening width: 20 inches of clear horizontal space.
- Maximum sill height: 44 inches from the finished floor to the bottom of the opening. Any higher and most people cannot climb out.
- No keys, no tools, no special knowledge to open it. If you need a key or a trick to get it open, it fails code.
What “net clear opening” means
The 5.7 square feet is the unobstructed opening — the hole you actually climb through with the window fully open. Frames, sashes, and hardware all eat into it, which is why the window itself has to be bigger than the minimums suggest. This is where DIY window selection goes wrong: the window meets the dimensions on paper but the clear opening does not. We size every window to the clear opening, not the frame.
Window well requirements
If the window is below ground level, the well has its own code minimums:
- Minimum 9 square feet of horizontal area — enough room to actually climb out through.
- Minimum 36 inches of projection out from the foundation wall.
- Ladder or steps required if the well is deeper than 44 inches.
- Drainage. The well must drain — standing water in a well is both a code issue and a basement leak waiting to happen. Every well we install gets a gravel bed and drain tie-in.
Does Ohio have its own rules?
Ohio follows the IRC as its residential baseline, but individual municipalities can amend it — permit requirements, inspection checklists, and registration rules vary city to city across Northeast Ohio. We verify the specific requirements for your address before we cut, and we pull the permit and pass the inspection as part of every job.
What if my house was built before these rules?
Existing homes are generally not required to retrofit windows they already have — old windows are “grandfathered” until you renovate. But the moment you finish a basement bedroom or pull a permit for basement work, the current code applies. And if you are selling, buyers’ inspectors flag non-compliant bedrooms regardless of when the house was built.
Does the glass need to be tempered?
Usually, yes — if any part of the window glass is within 18 inches of the finished floor, code requires safety glazing (tempered or laminated). Most egress windows meet this condition by design. We install code-compliant glazing as standard; it is not an upgrade.
Do all my basement windows need to meet egress code?
No. Code requires at least one compliant egress opening per sleeping room — the rest of the basement can use standard windows for light and ventilation. That said, if you are cutting one opening, additional windows are far cheaper to add during the same project than as a separate job later.
The short version
5.7 square feet clear. 24 inches tall. 20 inches wide. Sill no higher than 44 inches. Opens without tools. Well drains. That is the whole code — and every window we install meets all of it, permitted and inspected.
Not sure if your basement meets code? Call 216-232-2629 — we will tell you straight.