Window University – Styles & Functions

When it comes to the operation or function of a window- there are several options available. From a casement or picture window to sliders, both horizontal and vertical, there is the right solution for your project. Why you’d choose a casement verses a double hung, for example, may have to do with the view, or ventilation. In some cases, you may be required to have one style over another to meet egress codes.

Awning: Window similar to a casement except the sash is hinged at the top and always swings out.

Casement: A window sash that swings open on side hinges: in-swinging are French in origin; out-swinging
are from England.

Double-hung: A window consisting of two sashes operating in a rectangular frame, in which both the upper
and lower halves can be slid up and down. A counterbalance mechanism usually holds the sash in place.

Hopper: Window with sash hinged at the bottom.

Horizontal slider: A window with one or two movable panel(s) that slides horizontally.

Picture window: A large, fixed window framed so that it is usually, but not always, longer horizontally than
vertically to provide a panoramic view.

Single-hung window: A window consisting of two sashes of glass, the top one stationary and the bottom
movable, slides up-down.

As for the style or shape- there are many options to consider. With replacement windows,
often the shapes are determined by the existing windows or architecture. In the event
of new construction or remodel, you’ll have the option to choose the style that best
compliments the structure. When it comes to windows, there are many styles or shapes to

Bay window: An arrangement of three or more individual window units, attached so as to project from
the building at various angles. In a three-unit bay, the center section is normally fixed, with the end panels
operable as single-hung or casement windows.

Bow window: A rounded bay window that projects from the wall in an arc shape, commonly consisting of
five sashes

Half- Round: It is half of a round shape. A level base with a arched top.

Hexagon: A six sided window, just as the name suggests.

Octagon: Just as it sounds, a window with eight sides. Typically, a octagon or hexagon is small in size and
used as an accent window.

Pentagon or House window: Referred to as a “house” because its shape is similar to how a child might draw
a house. It has a square base with two equal vertical legs and two diagonal legs that create the “roof.”

Quarter-round: As the name says, it is one quarter of a round shape. It has two legs, one vertical, one
horizontal with a curve connecting the two legs

Triangle: A triangular window is typically used to follow the roofline.

Trapezoid: Similar to a triangle that follows the roofline but with a square bottom. It has a base level with the
floor, two vertical legs and a diagonal top leg.