About Standard Sizes

We keep an inventory of standard skylight sizes ranging from 2-4 ft. long and 2-4 ft. wide. Different parts of the skylight and opening vary from the even foot mark. The chart below details the measurements for each size.

See this guide for more info on how to measure a skylight.

Manufacturing skylights outside of these dimensions is possible, but it is more expensive and time consuming. Due to the unique nature of custom skylights, they are also not returnable.

Standard Curb Mount Dome Sizes

Size Standard Outside Curb Inside Measure of Frame Outside Measure of Frame Retaining Cap Dome Size

2’x2’

24” x 24”

24 ⅝” x 24 ⅝”

24 ⅞” x 24 ⅞”

25 ¼” x 25 ¼”

24 ¾” x 24 ¾”

2’x3’

24” x 36”

24 ⅝” x 36 ⅝”

24 ⅞” x 36 ⅞”

25 ¼” x 37 ¼”

24 ¾” x 36 ¾”

2’x4’

24” x 48”

24 ⅝” x 48 ⅝”

24 ⅞” x 48 ⅞”

25 ¼” x 49 ¼”

24 ¾” x 48 ¾”

3’x3’

36” x 36”

36 ⅝” x 36 ⅝”

36 ⅞” x 36 ⅞”

37 ¼” x 37 ¼”

36 ¾” x 36 ¾”

3’x4’

36” x 48”

36 ⅝” x 48 ⅝”

36 ⅞” x 48 ⅞”

37 ¼” x 49 ¼”

36 ¾” x 48 ¾”

4’x4’

48” x 48”

48 ⅝” x 48 ⅝”

48 ⅞” x 48 ⅞”

49 ¼” x 49 ¼”

48 ¾” x 48 ¾”