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the decision of 8' or 10' ceiling height. I know more space is
generally better, but if the space is for casual car repair and wood
working, is 10' really needed? anybody out there do 8' and really
regret it?

I have a detached garage that is 9' I would never think about anything
less. Handling lumber, clearance for the door opener, ducting for a dust
collector, hanging lights, etc. You already know the answer, just do it.