Door replacements are perfect timing with extensions! When we added our mudroom, we upgraded to steel doors from https://www.elegantentrydoors.ca/entry-steel-doors/ and it really tied everything together. The contractor mentioned that steel frames handle settling better than wood - important when you've got new construction meeting old. Plus with an extension, you want consistent insulation throughout. These doors have foam cores that match modern building standards. We chose a style with glass panels to bring light into the new space