3 N# E5 d' I6 S, S% ^/ H: o2 q5 Z8 PWhat you said is a concrete pad only. To build a garage structure on top with all electrical works included may cost you well over 10K, I guess.
ONe more thing you should be aware: Make sure you have piles underneath the concrete pad otherwise it won't last long bearing the heavy loads of your parked vehicles.