My current garage is 24X24 with 9 foot ceilings and in floor heat.
Next garage will definatly have in floor heat. Hopefully will be atleast 30 deep so I can work on the truck with the door closed. High enough for a car hoist and an overhead travelling crane.
Make sure you have atleast 2 seperate 220V circuits. My compressor, welder and plasma cutter all run on 220V. If I try to run the compressor and plasma on the same circuit it trips the breaker.