Do Window Well Covers Interfere With Emergency Egress?

A window well cover can interfere with emergency egress if it isn't chosen and installed with that specific window's job in mind — and when it does, that's a serious safety problem, not a minor tradeoff. This is the single most important thing to get right about a cover on a well over an egress window.

The principle, stated plainly

A window well cover over an egress window must never prevent that window from being used as an emergency exit. It has to be openable, or removable, from the inside, without tools, and without needing to know some special trick or hidden release. That has to hold true every time — at 3 a.m., in smoke, in the dark, under stress, after months of not being touched.

This isn't a suggestion or a nice-to-have. If a basement bedroom relies on this window as its required second exit, a cover that can't be opened quickly from inside defeats the reason the window exists in the first place.

Where this comes from

Wisconsin's Uniform Dwelling Code requires a basement or ground-floor room used for sleeping to have at least two exits (SPS 321.03(5)(b)1.), and it allows a code-compliant egress window to serve as that second exit (SPS 321.03(5)(b)4.d.). For that window to actually function as an exit, SPS 321.03(6)(a) sets a specific rule: the window shall be openable from the inside without the use of tools or the removal of a sash, and if it's equipped with a storm window or screen, that storm or screen has to be openable from the inside too.

Wisconsin's code doesn't go on to write a separate, numbered rule for window well covers the way it does for the window and its storm/screen. A well cover simply isn't something the Uniform Dwelling Code separately addresses. But the reasoning behind SPS 321.03(6)(a) doesn't stop being true just because the code doesn't repeat it for one more layer. A cover sitting over the well is functionally the same kind of obstacle a storm window or screen would be — one more thing between a person inside and the outside air — so it has to be held to the same practical standard as a matter of basic safety, even though it isn't itself a separately cited code requirement. This is the shared safety principle referenced throughout this site anywhere window well covers and egress windows come up together, including on egress window installation and window well covers.

What this rules out in practice

• Locks, padlocks, or fasteners that need a key or tool to release from inside. If getting the cover off requires finding a key or a wrench first, it fails the standard regardless of how secure it makes the well look from outside.
• Covers that can only be opened or removed from outside the well. A design that works fine for a contractor standing in the yard but can't be pushed open by someone standing at the window from inside doesn't meet the standard.
• Covers screwed, bolted, or permanently fastened down. Any fastening method that isn't something a person can release by hand, from inside, in the dark, fails the same way a padlock does.
• Heavy covers that are difficult to lift even when technically unlocked. "Openable without tools" implies openable by the people who actually live in that room — which may include kids, older adults, or anyone who isn't especially strong. A cover that's unlocked but too heavy to lift under stress is still a functional barrier.
• Ice, snow, or debris allowed to build up and jam a cover shut. Even a well-designed cover fails this standard if conditions are allowed to seal it in place. This is a maintenance issue as much as a design one.

What a compliant setup looks like

A cover over an egress window well should be one that:

• Hinges, lifts, or slides open with hand pressure alone, from inside the window.
• Has no lock, latch, or fastener that requires a key or tool.
• Is light enough, or leveraged well enough (via its hinge or hardware), that anyone likely to use that exit can actually move it.
• Gets checked periodically — especially after heavy snow, ice storms, or a season of leaf buildup — to confirm it still opens freely, not just that it did when it was installed.

Not a reason to skip a cover

None of this means a well over an egress window should go uncovered. It means the cover has to be selected and installed with this specific job in mind, not chosen purely for looks, debris control, or how secure it seems from the yard side. Window well covers covers how a cover fits with the well's dimensions and materials once this requirement is accounted for, and window well cover materials compared walks through which materials and hardware styles tend to make this easier versus harder to get right.