How We Count Windows
One Window
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Single Hung Windows
Windows that have one (single) sash that slides up and down.
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Double Hung Windows
Windows that have both (two) sashes that slide up and down.
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Plate Windows
A large, single pane of glass.
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Plate Windows
A large, fixed single pane of glass that is non-operable.
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Transom Windows
A window that is non-operable or fixed, often above or near a door or another window.
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Hexagon/Octagon
A fixed window that is designed to be non-operable and consist of a glazed frame or a non-operating sash within a frame, cut in the form of a six or eight-sided polygon.
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Suspended Grids/False Grids
The grid that "creates" the panes is suspended or between sheets of glass. You can't feel them with your hand.
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Removable Grids
Window grids that can be added or taken from the window frame as desired. Usually attached on the room side of the glass.
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Glider and Sliding Glass Windows
Open by sliding horizontally along a track for ease-of-use.
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Awning, Hopper, Projected Windows
A window consisting of one or more sash hinged at the top or bottom which project outward or inward from the plane of the frame.
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Casement Windows
A window consisting of one hinge to open from the side (adjacent to the jambs), which project outward or inward.
Two Windows
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Two Single/Double Hung Windows
Two of these windows placed side-by-side are counted as two.
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Single Windows With Transom
A full-size window with a transom counts as two.
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Sliding Glass Doors
These large glass panels are counted as two windows.
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French Doors
Doors with glass panes throughout its length, typically with one or two doors that swing open.
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Fixed/Non-Removable Grids
Windows with non-removable obstructions making window look and feel like individual pieces of glass.
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Two Casement Windows
Two window sashes hinged to open from the side (adjacent to the jambs), which project outward or inward.
Three Windows
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Three Double Hung Windows
Three double hung windows grouped together are counted as three windows.
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Bay Windows
A window or series of windows forming a bay in a room and projecting outward from the wall (in this case 3 panes of glass).
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Storm Windows
Additional windows installed outside of the primary windows for insulation.
Specialty Windows
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Garden Windows
Specialty window that protrudes from the house, may have shelves, angled glass for plants.
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Skylights
Specialty window that is installed in the roof for natural light.
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Jalousie Windows
A series of glass slats set in a track. The slats are operable.
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Glass Block Windows
Thick blocks of glass, between 2 and 4 inches thick, that are inset into a window frame.
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Stained or Leaded Windows
Colored glass used for making decorative windows through which light passes.
