/ q) n0 F# y. [2 C) K0 ~: |# N4 ?1 S- HWhat 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.