The Average Size of Picture Windows
The average size of a picture window is about 15 inches in width and 20 inches in height. The smallest window is only 3 inches wide and 4 inches high The largest window is an incredible 23 feet wide and 9 1/2 feet tall The average window size is about 17% larger than the minimum required size, so if your room has windows that are too small, you might need to consider replacing them with bigger ones.
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