The number and patterns of panes in a window. In a double-hung window some have the same number in the upper and lower sash: (1) one-over-one, (2) two-over-two, (4) four-over-four, (6) six-over-six, (8) eight-over-eight, (9) nine-over-nine, (10) ten-over-ten, (12) twelve-over-twelve, and (15) fifteen-over-fifteen. Another common variation is a multi-paned upper sash over a single paned lower sash: (2) two-over-one, (4) four-over-one, (6) six-over-one, (12) twelve-over-one, (15) fifteen-over-one, and (40) forty-over-one. Another variety is multi-paned upper and lower sashes: four-over-two, four-over-six, six-over-four, six-over-nine, eight-over-twelve, nine-over-six, nine-over-nine, twelve-over-eight, twenty-light sash, and twenty-five-over-twenty window. Photo from Appomattox Courthouse National Historical Park, Appomattox Courthouse, Virginia, 2021. (Kremer, 2023)

Table of Light Arrangement with Upper Sash in X-axis and Lower Sash in Y-axis

1 U

2 U

3 U

4 U

5 U

6 U

7 U

8 U

9 U

10 U

11 U

12 U

1 L

one-over-one

two-over-one

four-over-one

six-over-one

nine-over-one

twelve-over-one

2 L

two-over-two

four-over-two

3 L

4 L

four-over-four

six-over-four

5 L

6 L

four-over-six

six-over-six

nine-over-six

7 L

8 L

eight-over-eight

twelve-over-eight

9 L

six-over-nine

nine-over-nine

10 L

ten-over-ten

11 L

12 L

six-over-twelve

eight-over-twelve

twelve-over-twelve

List of Window Types by Pane Count

2 - one-over-one

3 - two-over-one

4 - two-over-two

5 - four-over-one

6 - four-over-two

7 - six-over-one

8 - four-over-four

10 - nine-over-one, four-over-six, six-over-four

12 - six-over-six

13 - twelve-over-one

15 - six-over-nine, nine-over-six

16 - eight-over-eight, fifteen-over-one

18 - nine-over-nine

20 - twenty-light sash, twelve-over-eight, ten-over-ten, eight-over-twelve

24 - twelve-over-twelve

30 - fifteen-over-fifteen

41 - forty-over-one

45 - twenty-five-over-twenty window

See Also

ten-over-ten

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