I want to put a cat door in from the garage to the house and move their food, water, litter, cat tree and cat condos out to the garage... (a bigger bedroom!! LOL).
*But* I want to put a cat door on the door. It's metal... I want them to be able to come and go in the house...

Suggestions? I assume a hole would have to be cut? Who would/could do this?

The garage door stays closed. We use it for storage only.