I’ve seen this problem before but I’ve never been asked to fix it. The hardwood flooring installer sets his jamb saw a little too high (with a dull blade probably) and proceeds to hack off all the jambs and casings, assuming they’ll be just fine. In his wake is a house full of gaps ranging from pretty good to a pretty bad 3/8 inch. Personally I use a Japanese saw so I never have this problem but I’m sure a jamb saw in the right hands, with a sharp blade, will do just fine.
The homeowner is pretty happy with his house except this one problem and it really disturbs him. But not enough to rip his doors out and redo them. All the trim is painted so maybe the fix won’t be too hard. Should I cut slivers of the trim and slide them in place and sand and paint? Is there a product I can use to fill the gaps and mold into the shape of the trim? I could always make my own knife shaped just like the trim profile and mold a product with that.
I thought I’d ask around before I attempted anything. I’m sure someone has encountered this before.