Egress Windows and Window Wells: What Makes a Legal Bedroom in Utah
Upterra Builders · May 6, 2026
Here is a mistake we see all the time when we get called to look at a basement someone else finished. There is a nice room downstairs, the family calls it a bedroom, and it is not legal, because there is no egress window. It cannot be counted as a bedroom when you sell, and worse, someone is sleeping in a room they cannot climb out of in a fire. If you want a real, legal, safe basement bedroom in Utah, the egress window is not optional. It is the whole point.
What Egress Actually Means
Egress just means a way out. Utah follows the International Residential Code, and the code says any basement with a sleeping room, and most finished basements in general, needs an emergency escape and rescue opening. In plain terms, a window big enough for a person to climb out of, and big enough for a firefighter in full gear to climb in. A small slider up near the ceiling does not count.
The Numbers That Make a Window Legal
You do not have to memorize the code, but it helps to know the targets we build to. For an emergency escape window, the code calls for a net clear opening of at least 5.7 square feet. That is the actual open space when the window is fully open, not the size of the glass. There are also minimum dimensions:
- A minimum net clear opening height of 24 inches.
- A minimum net clear opening width of 20 inches.
- A sill height no more than 44 inches above the finished floor, so a person can actually reach and climb out.
Both minimums have to be met at the same time while still hitting the 5.7 square foot total, which is why a window has to be sized correctly, not just tall or just wide. This is exactly the kind of detail an experienced builder gets right on the first try and a weekend job gets wrong.
The Window Well Has Its Own Rules
If the window sits below grade, which almost every basement egress window does, it needs a window well, and the well has code too. The well has to give at least 9 square feet of floor area, with a minimum dimension of 36 inches in both width and projection, so a person actually has room to stand up and get out. If the well is deeper than 44 inches, it needs a permanently attached ladder or steps so someone can climb up and out. That ladder can encroach a small amount into the well but still has to leave room to use the window.
Covers and grates
Window well covers and grates are allowed, and they are smart in our climate to keep snow and debris out, but they have to be releasable or removable from the inside without tools, keys, or special knowledge. A cover you cannot push off from inside defeats the entire purpose.
Cutting an Egress in an Existing Foundation
A lot of Tooele basements were poured with no egress at all, so making a legal bedroom means cutting a new opening in the concrete foundation and digging a well outside. This is real work. It involves saw-cutting the foundation wall, setting a header, installing the window and buck, excavating and setting the well, and backfilling with proper drainage so the well does not fill with water. Done right it looks like it was always there. Done wrong it leaks and cracks. This is permitted and inspected work, and it is not a DIY afternoon.
Why This Matters Beyond Code
Two reasons this is worth doing right. First, safety. A basement bedroom without egress is a real hazard, and that is the reason the code exists. Second, value. When you sell your Tooele County home, an appraiser and a buyer will only count a basement room as a bedroom if it has legal egress. A finished basement with three legal bedrooms is worth a lot more than one with three rooms that technically are not bedrooms. The egress window pays for itself.
How We Handle It
When we finish a basement and you want bedrooms, we plan the egress from the start. We size the windows to clear code, dig and set proper wells with drainage tied into the home's system, add the ladder where depth requires it, and get it inspected. You end up with real bedrooms that count on paper and keep your family safe. That is the difference between a finished basement and a legally finished basement.
Upterra Builders installs egress windows and wells and finishes legal basement bedrooms across Tooele, Stansbury Park, Grantsville, and Erda. Danny and Trayson can tell you exactly what your basement needs to make a room count.