I'd like to know the answer as well. My guess is around 14-15 feet depending on the height of the vehicles you want to store and if you wanna have to duck when you get out or not...I figure I'm 6 ft...add 2 ft for a lift or so and another 6-7 ft for a vehicle on top.
i just completed a 600SF addition to my existing garage. i did 13' ceilings utilizing liftmaster "jack shaft" operators. both front and rear doors lift to within 7" of the ceiling. i don't think that you need more than 13' ceiling height for just about any lift configuration. FWIW.
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