An "outbuilding" is defined as any structure which is not attached to the main structure. This definition does not include bonafide additions to the main residence or garages, but does include storage sheds and gazebos.
OTOH, if you think in terms of "bonafide addition" you might be on the right track. It'll cost an order of magnitude more than a pre-fab shed, but you might get what you want. Build a shop, include a breezeway, and "wolla!", yer pig in you-know-what.
I mention all this because 10' x 12' is just too small for a woodworking shop. IMHO, you have to either move the other stuff out of the garage into a shed, or build a proper shop of at least 12' x 20'.
JR
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