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Know your window wells

Window Well Facts

Straight answers about window wells — what the code actually requires, what the materials really do, and what water in a basement actually costs. No sales pitch, just the facts.

Window well frustrations?

Cleaning leaves, frogs & debris?
Open wells become a magnet for wet leaves, critters and standing water — every single season.
Can't find the right size?
Big-box covers rarely match older or oversized wells. Ours are measured and built to fit yours exactly.
Plastic covers that break or blow away?
Thin bubble covers crack in the sun, snap under snow, and end up in the neighbor's yard by spring.
Worried about safety & flooding?
An uncovered well is a fall hazard for kids and pets — and a direct path for water into your basement.
Section R310

Egress code, in plain English

Illinois follows the International Residential Code (IRC). If your basement has a bedroom or sleeping area, these are the numbers an inspector is looking for. Your village may amend them, so always confirm with your local building department.

Escape opening size
At least 5.7 square feet of net clear opening. Openings at grade level may be as small as 5 square feet.
Clear opening height
At least 24 inches.
Clear opening width
At least 20 inches.
Sill height
The bottom of the opening can be no more than 44 inches above the basement floor.
Window well size
At least 9 square feet of horizontal area, with a projection and width of at least 36 inches.
Deep wells
A well more than 44 inches deep must have a permanently affixed ladder or steps.
Ladder specs
At least 12 inches of inside width, projecting at least 3 inches from the wall, with rungs spaced no more than 18 inches apart vertically.
Covers, bars and grilles
Must be releasable or removable from inside without a key, a tool, special knowledge, or more force than it takes to open the window normally.
Drainage
Window wells must be designed to drain, connected to the home's foundation drainage system or an approved alternative.

Every egress cover and ladder we install is built to meet these requirements.

Materials

What the materials actually do

A window well cover is only as good as what it's made of. Here's what ours are made of and what those materials are rated to do.

88%Light transmission through G.E. Lexan polycarbonate sheet, so covering a well doesn't darken the basement.
800 lbsWhat our custom covers are built to support.
12–16 ft-lb/inNotched Izod impact strength of Lexan polycarbonate sheet; unnotched samples don't fail at all in the same test.
0 rustAll anodized aluminum hardware and framing.

Polycarbonate is the same family of material used in safety glazing and machine guards. The thin bubble covers sold at big-box stores are usually much thinner plastic or acrylic, which goes brittle in sunlight and cracks under snow load.

Climate

Chicago weather is the real test

38.4 inAverage snowfall a year at Chicago O'Hare (1991–2020 climate normals).
39 inAverage yearly precipitation in the Chicago area.

That snow doesn't fall once and leave. It piles into open wells, melts during a thaw, refreezes overnight, and works at the seams of a cover all winter long. Add spring rain on already-saturated ground and an open window well turns into a basin pointed straight at your basement window.

The cost

What water in a basement actually costs

$15,400The average homeowners insurance claim for water damage and freezing (2019–2023 five-year average, Insurance Information Institute).
22.6%Water damage and freezing's share of all homeowners property damage claims in 2023, the second-largest cause after wind and hail.

A cover is one of the least expensive things you can do about it. Keeping rain, snowmelt and debris out of the well keeps water away from the window frame in the first place.

Questions

Window well FAQ

Does a window well cover have to come off from the inside?

If the well serves an emergency escape window, yes. The code requires that covers, bars and grilles be releasable or removable from inside without a key, a tool, special knowledge, or more force than it takes to open the window normally. Our egress covers are built to open that way.

How deep can a window well be before it needs a ladder?

More than 44 inches deep and the code requires a permanently affixed ladder or steps. Ladders need at least 12 inches of inside width, have to project at least 3 inches from the wall, and the rungs can be no more than 18 inches apart.

Will a cover make my basement dark?

No. G.E. Lexan polycarbonate transmits about 88% of visible light, so a covered well stays bright. Most homeowners tell us the basement looks brighter afterward, because the cover keeps the well clean.

Can I just buy a cover at the hardware store?

You can, but stock sizes rarely fit older or oversized wells, and the gaps are what let leaves, water and animals in. We measure and build each cover on site in your driveway so it fits your well exactly.

Do window well covers stop basement flooding?

They stop one common cause of it — rain and snowmelt collecting in an open well and pushing past the window. A cover isn't a substitute for working gutters, grading, or a sump pump, but it removes a direct path for water right at the window.

How much snow can a cover hold?

Ours are built to support up to 800 lbs, which covers snow load, a person standing on it, or a child or pet walking across it.

Sources

Not sure whether your wells meet code? We'll measure them on site and tell you straight — free, no obligation.

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