Door Question for Home Improvement Guys

It depends on the door. Split-jamb doors are pre-hung with the frame and casing/trim. The jambs are built in a way where they can expand to cover a range of wall thickness. It's kind of hard to explain, but you can see in the picture below. You can slide the little "tenon" out some if your walls are wider. Then you nail the jamb in place with shims in appropriate location and everything is locked in. I do not know how you would take an existing one and expand it. Once you pull it all out, you likely break all the jamb and casing and it's not going to work well. The pre-hung doors aren't overly expensive though to start from scratch with a new one. I changed all of the doors to 6 panel doors in our first starter home and had never done that type of work before. After the first one, it was pretty easy. And the first one would have been pretty easy if I had YouTube to reference the way we do now.

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Rip a 3/4” board 1/4” thick strips, apply to door frame, then apply trim.

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This. We call it “furring out”.

What’s the casing look like? Add a backband trim to the outside of the casing. Probably look better once it’s done. Only problem is good chance it will have to be a custom run trim. Also can probably make a two piece backband that will look good. Just have to use some imagination

Trying to remove those jambs and put back together probably not worth the time. Probably easier to rebuild the jamb at that point. Or buy new doors.