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What 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.
我刚建过一个20*22的。# j( A. P% p) f f' ]' u! t
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已经有地基的,所有的人工材料申请费什么的加起来,一万二千块。 + f. V2 C; Y( b2 ^# J4 z7 p( i . n8 c" J: }1 y% S" {5 L只做地基的,五千到五千五之间,全包。