What Is a Casement Window?

A casement window is hinged on one side and swings open outward using a hand crank — think of it like a small door for your wall, rather than a window that slides up and down. That single moving pane, with no rail splitting the glass, is what gives casement windows their clean look and wide-open airflow.

When a casement is closed, the sash presses firmly against weatherstripping around the entire frame, creating an airtight seal that blocks drafts far better than a double-hung or slider — which means lower energy bills in a Bismarck or Fargo winter.