Slab Foundation

• $5-7/sf - [1] [2][3]
• A slab foundation already includes a floor - so cost would cover two elements of the building
• Although a concrete foundation can get expensive in areas with deep frost lines, a frost protected foundation only needs to be 18 in deep. This means that the cost of a slab foundation in the South and Midwest would be about the same.
• Concrete foundations can support 1 or 2 stories without added cost
• House foundation - $7 - [4]
• National average $9 - [5]