For a professional-grade concrete foundation, budget between $6 and $10 per square foot. For a common 40×60 shop, this equates to roughly $14,400 to $24,000. This price typically covers the excavation, formwork, reinfocement (rebar), and the pouring of a 4-to-6-inch thick slab. Prices may increase if your local soil requires extra grading or if you need a thicker slab to support heavy machinery or vehicle lifts.