Not sure how your code officials interpret fire wall/ceiling requirements for John Deere rooms, but here where I live as long as the door will not permit a car or truck to enter they don’t consider it a garage. In my case the basement John Deere room had a 6-foot over head door. IMO if you park riding lawn mowers, motorcycles, etc. it should have the same fire protection as a standard garage. How is this handled in your area?