Can I add a central wall in my 2-car garage to keep heat out of my laundry area without city approval/if I meet professionalstandards?
Keep the door shut, put some power in it, and go for it. It's not a full conversion anyway. Just do the work without the prying eyes of neighbors.
All for leaving the city out of it. But you should go by all the national codes.
If you don't add an outside door, you should be okay