What is an egress window?

Every legal sleeping room needs one, on any floor, and a finished basement needs at least one whether or not it holds a bedroom. Below grade, the window opens into a well, which has its own minimums: 9 square feet of floor area, 36 inches of projection out from the foundation, and a permanently attached ladder or steps whenever the well is deeper than 44 inches. Any grate or cover has to open from inside without tools, keys, or special knowledge. To audit your own house, find the oversized casement or slider in the corrugated steel or composite well and measure the opening with a tape, sash swung fully back.

This window is the second way out of a room, and smoke in the stairwell is precisely when it matters. In practice the opening fails long before the glass does. Sashes get painted shut, wells fill with leaves until the drain clogs and water presses against the pane, covers get bolted down against raccoons, and finished-basement storage stacks up in front of the only exit. There is a money side as well. An appraiser will not count a basement room as a bedroom without compliant egress, so a three-bedroom listing quietly becomes a two-bedroom, and an unpermitted basement bedroom can stall a closing or complicate a claim.

Twice a year, spring and fall, open each egress window fully, confirm the latch and any security hardware release from inside without a key, and check that a child in the room can work them. Clear the well of leaves every fall, verify the gravel drain still takes water, and shake the ladder to confirm the anchors are tight. Ten minutes covers the whole house. Add it to your seasonal checklist next to the smoke alarm test and the extinguisher gauge check, since all three belong to the same escape plan.