what is the average size house window?
Standard sliding window widths are 36, 48, 60, 72 and 84 inches wide; the windows themselves are actually 36 1/2, 47 1/2, 59 1/2, 71 1/2 and 83 1/2 inches wide to allow for installation. Standard heights are 24 inches, 36 inches, 48 and 60 inches.