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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.
Concrete prices here ranged from $90 to $110 per yard, some with other fees added on. A 40x60 pad is 2400 square feet, so you would need around 30 yards of concrete (about $2700 - $3300) not including footings and labor for any grading or finish work. Standard slabs are 4 thick.