The average pricing for residential grading per square foot is $.50 to $2 per square foot leveled and flattened, but that cost can easily rise with complex projects, negative slopes, and drainage excavation needs.   The average price range for commercial grading per square foot runs at a slightly higher price point between a $.75 and $2.50 range. Commercial grading services are typically larger jobs, so the minimum trip cost can sometimes raise the pricing per square foot for smaller jobs that can be finished quickly.