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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Price as of Jul 24, 2026. Product prices and availability are accurate as of the date indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
Inputs
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: Jul 24, 2026
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