Painted or stained doors?

Painted doors are not that hard to add strips to the edges and than fill the joint.

Stained is more of a problem since a color and 'grain' match is very hard to get.

Noticed you said the doors are stained.

Add some contrasting wood of a similar grain to the edges.

You are not going to hide the additions, so make them look intended.

Adding boards to the frame will certainly work in terms of functionality. You obviously would have permanently noticeable 1" strips though.

As I see it, the easiest, least noticeable way to fix this, is to add the 1" strip BEHIND the jamb of the door frame--not terribly hard to do, and then the additions won't be visible once the frame is put back on--and the doors don't need to be altered at all!

The forum always prints ' for " in the thread title so you have to say inches.

Thanks, columbusguy - that is a great idea! I didn't think of that before, but I think I will give that a try. Thanks to all for your help and advice.

Before you proceed....

Putting anything behind the frame means you shift everything inward. That is fine for the door, but it will create a 1" gab to the baseboards. It will also reveal 1" more of plaster on each side, so you'll probably need to repaint that wall.