My friend cut panels of solid foil backed insulation and stuck them to her garage door, and then added a large piece of batting over that for a design wall

my boyfriend loves to cook, and I'm of course a quilter, so when we first talked about moving in together (which hasn't yet happened), I claimed the garage of the as-yet-to-be-chosen house. He then argued that HE claimed the garage for his extended kitchen, so I think the discussion has been tabled for now. No use arguing over an as-yet-to-be-determined space. But I'm saying right now, the garage is MINE!!!

I agree with Neesie. You'll need insulation for sure and climate controls (heat and a/c). I would definitely replace those doors if you can. They will leak like crazy and run up your electric or gas bills. I'd do a good flooring with some padding. Standing on concrete is killer on the legs

A friend did that. Has a portable heat pump for heat and ac, vented out thru the wall instead of window , for security reasons. She insulated the garage door and hung batting on it for a design wall. Had power added as outlets were scarce. We use it uear round.