All portable Sturdi-Bilt Storage Barns and Gazebos come with treated foundation runners. The typically flat and gently sloped yards of Kansas with well-established turf are satisfactory foundations for many homeowners needing basic lawn and garden tool storage. This is especially true for smaller buildings up to 200 sq. ft. Admittedly, the most enduring foundation for a storage building is composed of concrete. STURDI-BILT delights to deliver to or build on a level, square concrete base. The portable structure can be placed on the slab or the wood floor can be deleted and the building built on the site like a garage. However, cost considerations cause some to favor a rock pad. Customers can elect to do the work or contract with a professional like Solid Ground Services. In either event, we recommend removal of 3-4″ of sod, then filling back in with crushed limestone, making sure the entire area of limestone is level. It is recommended that the rock base be 12″ larger on all four sides and bounded by treated timbers.