Casement window
A window hinged at the side that swings open like a door. The arc shows the way the sash opens.
This explains what a symbol represents on a drawing. Conventions vary between firms and standards, and a drawing's own legend takes precedence.
How to read it
Casement windows have side-hinged sash, usually made to swing outward, and the whole window can be opened, where a double-hung window opens only half its area (Navy, Builder 3 & 2). Because the sash swings in plan, the symbol shows the swing (TM 5-704). The Navy's Builder Basic course shows casements drawn as pairs opening out and as single sash opening in.
Also searched as: hinged window.
Look-alikes
A door symbol swings the same way; a casement sits in a window opening.
More blueprint symbols
Sources
- Builder 3 & 2, Volume 2, NAVEDTRA 14044, Naval Education and Training Command, U.S. Navy, ch. 4, casement windows
- Builder Basic, NAVEDTRA 14043A, Naval Education and Training Command, U.S. Navy, ch. 3, fig. 3-19
- Construction Print Reading in the Field, TM 5-704 / AFM 85-27, Departments of the Army and the Air Force, para. 2-2a
Last reviewed September 24, 2026 by Rory Hansen. How we research