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Egress Windows Prices : Egress Window Size Requirements Egress Window Size RequirementsOur egress window size requirements provides building code size charts for many of the most popular styles of basement egress windows. The four most popular basement egress window options include casements, horizontal sliders, double hungs and single hung windows.
If you have egress window cost or project questions, ask our site editor and get the answers you need! Email your questions to Bill Casement Egress Window SizesCasement windows are one of the most popular options when it comes to a basement egress window. A casement window is hinged on one side and, when opened, provides a much larger net clear opening than with any other window style (see the picture below to see why). This means that a casement does not have to be nearly as large as other window styles to meet the minimum building code requirements.
Sliding Egress Window SizesSliding windows are the second most popular basement egress option behind casements. Horizontal sliding windows open from side to side and are typically longer horizontally than vertically. Horizontal sliders have a smaller percentage of net clear opening compared to the total size of the window opening than a casement. The result is a larger window requirement to meet the building codes 5.7 square feet.
Double Hung Egress Window SizesDouble hung windows are also a popular basement egress window option. Double hungs are more vertical than horizontal in terms of their shape and have an upper and lower sash that can be opened independently of one another. Double hungs offer roughly the same net clear opening percentage (45 percent of the total size of the window) as a horizontal slider.
Single Hung Egress Window SizesSingle hung windows have a single lower sash that can be opened vertically in much the same way as the lower sash of a double hung window. Similarly to a double hung window, the single hung provides approximately 45% net clear opening compared to the total window size.
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