Question: are all doors the same size?
Answer: The height for all passage doors must be a minimum of 80 inches and the standard width sizes for interior doors are 24”, 28”, 30”, 32” and 36”. ... Standard thickness for an interior door is 1 3/8, if your door exceeds 36” or is over 90” in height; the recommended thickness for that door would be 1 3/4 inches.