Well, replacing doors is a big deal. The main thing is to observe all the nuances when ordering doors, but it is best to contact a professional service. You can learn more about standard door size https://thwindowsdoors.com/brief-look-standard-window-sizes-door-sizes/ and use a reliable door fabrication and installation company. This is the most comfortable solution. to make your home comfortable, cozy and safe. See also the catalog.