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Because proper installation of a concrete pad requires considerable preparation before the concrete is poured, this is a project best left to experienced concrete contractors. 1  The average minimum cost per square foot for a concrete pad is $1.37.  The average maximum cost per square foot for a concrete pad is $1.77.
Best Answer: Concrete needs to be poured about 4 inches deep. A 30ft x 30ft x 4 inch pad you would need about 11 cubic yards of concrete(this is how concrete is sold). Finished Concrete right now goes for anywhere from 120 to 150 dollars per cubic yard depending on where you live.SO thats about $1,200 to 1,500 dollars for the size your talking about,Source(s): 30ft x 30ft x 4 inch pad you would need about 11 cubic yards of concrete(this is how concrete is sold).