The International Residential Code requires interior doors to reach an average of 80 inches in height and 28 to 32 inches in width, as of 2015. Homeowners can typically find doors meeting the standard measurements at building supply retailers.
Interior doors allow users to move from one room to another. They may vary in thickness, and individuals interested in performing basic work around their home should document the thickness to make certain installations easier. The thinnest interior door available for purchase is 1 3/8 inches, though a thicker door is more beneficial for security purposes. Different measurements apply to bathroom and closet doors.