Basement Egress Requirements in Cheyenne, WY

A basement room used for sleeping requires an emergency escape and rescue opening — a window or door large enough for someone to climb out of and for a firefighter in full gear to climb into, reachable without a tool or a key. This is the requirement people mean when they talk about "egress", and it is the single most common reason a finished Cheyenne basement fails to count as having a bedroom.

What is actually required

The requirement covers several dimensions at once, and a window can satisfy some and fail others:

• Clear opening area, the actual open area when the window is fully operated, not the size of the glass or the rough opening.
• Minimum clear height and width — both have floors, and satisfying one does not excuse the other.
• Maximum sill height above the finished floor, the opening has to be reachable, which is why a small window high on the wall does not qualify.
• Operable without tools, keys or special knowledge. It has to work in the dark, in a panic, by someone half asleep.
• Window well dimensions, where the opening is below grade, the well itself needs enough clear area to climb into and out of.
• A permanently affixed ladder or steps once the well exceeds a certain depth.

We are not printing the numeric thresholds here. Cheyenne's adopted code edition is currently ambiguous in published sources — secondary guides say the 2021 IRC while a January 2025 City ordinance shows amendment to the 2024 edition, and the dimensional requirements are exactly the kind of detail that can differ. Publishing confident numbers we have not confirmed with the building department would be worse than useless. Call (307) 637-6265 for city addresses or (307) 633-4615 for county addresses and ask for the current figures, or we will confirm them as part of your project.

Why existing basement windows usually fail

Most basement windows in Cheyenne's 1970s and 1980s housing stock were installed for daylight and ventilation, not escape. The common failure modes:

• Too small in clear opening area, even when the frame looks reasonably large.
• A sliding or hopper design where only half the frame actually opens.
• Set too high on the wall to be reachable from the finished floor.
• An existing well that is too shallow or too narrow to climb out into.
• A well with no ladder where depth requires one.

Sometimes enlarging an existing opening is cheaper than cutting a new one. Sometimes the existing location is simply wrong — bad grade outside, or something structural above. That assessment is the first thing worth doing. See egress window installation.

The Cheyenne well problem

Meeting the dimensional requirement is only half the job here. This area receives roughly 58 to 63 inches of snow annually, and in one of the windiest cities in the country that snow drifts rather than settling evenly. A window well that satisfies every code dimension and has no drainage will pack with drifted snow, hold the meltwater against a fresh opening in your foundation, and become the wettest point in the basement.

A compliant well and a well that stays dry are two different specifications. You want both. Drainage and a proper egress-rated cover, one that can still be opened from inside — are what bridge the gap.

Other things plan review looks at

Egress rarely travels alone. Expect the reviewer to also check smoke and carbon monoxide alarm placement, ceiling height in habitable rooms, light and ventilation, and that any enclosed mechanical equipment still gets the combustion air it needs, which at Cheyenne's elevation of around 6,000 feet is not a trivial calculation.

Related: basement bedrooms and egress, the permit process, and the cost breakdown.