A slab and a pad are basically the same, for the exception of what is going on top. A pad will usually allow for garbage cans orsmall sheds. where as a slabs can handle bigger structures such as garages, large sheds, or complete room additions. All of which are done with one of either trench foundations or pilon holes which ever each village code calls for. Contact 3D for a free quote and consultation, and we will work with you to provide the best service possible.