I can't think of too much new construction (and when I say "new," I'm thinking in the last couple of decades, so caveat emptor

) that would
purposely design-in a 24" door as a major thoroughfare unless it was an afterthought, eg closet cubbyhole, garage storage enclosure, etc. Heck, the plans I drew had 30" interior doors everywhere and 36" doors on the outside (which I thought was code, but won't swear to that).
If you've got 24" doors, your only options are to assess the potential to refit the opening for a wider door and see if something like a 30" door would fit. Then you've got the hassles of some demo work and refinishing, but I'm guessing most places with a 24" door already likely won't have the space to accommodate a wider opening...
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