This weekend I'm going to replace the side door of my garage. I carefully measured the door and opening of the existing door. 31.5 inch wide between the outside of the frame. The rough opening in the wall is 32 inches wide and 81.5 inches high. So far so good.
Yesterday, I went to Home Depot, picked out a door style, and bought the 32x80 inch model, pre-hung, right-hand side. So far so good.
Today I measured the existing door frame again: 32x81.5 rough opening.
I measure the door: 33.5x81.5 ... Huh? Check the sticker. Yup, it says 32x80. Measure the door again: 33.5x81.5 inches.
I should have bought the 30x80 model, like my gut told me to. Another trip to Home Depot coming up. Return the door, buy the smaller version.