That's like asking what shade of blue is the sky? The cost per-square-foot depends on a number of factors including location, cost of materials, cost of labor, and more. Are you talking about Iowa or Hawaii? Is the 'construction' new from the ground-up, or a remodel project in an existing home? Is the 'construction' a basement rec room, a new garage, or a brand new house? Depending upon the location and the type of project, the price of new construction will vary widely from $75 per-square-foot to more than $400 per-square-foot.