Casement window
A window hinged at the side that swings open like a door. The arc shows the way the sash opens.
Easily confused with
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.
This explains what a symbol represents on a drawing. Conventions vary between firms and standards, and a drawing's own legend takes precedence.
Look-alikes
A door symbol swings the same way; a casement sits in a window opening.
Read next
- Next in Blueprint symbolsSliding windowA window whose sash slides sideways to open. The plan shows two sash lines side by side, offset from each other.
- The same shape in African flagsFlag of the ComorosThe Comoros flag is four horizontal stripes, yellow, white, red and blue from the top, with a green triangle along the pole holding a white crescent and four white stars in a line between its tips. Norway’s Store norske leksikon explains the crescent as the symbol of Islam and the four stars as the four islands of the Comoros; Lex says the four stripes are said to stand for the islands too.
More blueprint symbols
The same shape elsewhere
Browse symbols drawn with curves and waves, lines or squares and rectangles.
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
Researched, edited and approved by Rory Hansen before publishing. Last reviewed September 24, 2026. How we research
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