Gravel Needed
4.7 cu ft
Well Volume
37.7 cu ft
Gravel Tons
0.24
Cost
$12
Gravel Needed
4.7
cu ft (0.24 tons)
Well Area
9.4 sq ft
Well Volume
37.7 cu ft
Material Cost
$12
Egress
Meets IRC
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Result
A semicircular well 4 ft wide x 3 ft projection, with 6 inches of drainage gravel.
Inputs
Result
Smaller utility well for non-egress basement windows.
IRC code requires egress window wells to be at least 9 sq ft in floor area with a minimum 36-in projection from the wall. The opening must be at least 5.7 sq ft (44 in height, 20 in width minimum).
Install 4-6 inches of clean gravel at the bottom of the well for drainage. A typical 4 x 3 ft well with 6 in of gravel needs about 4-5 cu ft of washed stone.
Yes, every window well needs a drain connected to the footing drain or a dedicated sump. Without proper drainage, water pools in the well and can leak through the basement window.
The well must extend at least 6 inches below the window sill to prevent water from reaching the window frame. For egress wells, the depth must accommodate a large enough opening for emergency exit.
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Last Updated: Mar 19, 2026
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