In many cases, a small shed can sit on a simple foundation resting on the surface of the ground. one option for an on-grade foundation is to rest the shed on concrete blocks that are themselves resting on 2- or 3-inch beds of gravel.. The simplest way for a diyer to build a foundation for a shed is by creating what is known as an on-grade foundation. unlike a foundation with poured concrete footings, an on-grade foundation is constructed by stacking solid concrete blocks directly on the ground.. "foundation for tiny house anatomy of a pole platform foundation build tiny house" "shed plans - my shed plans - how to build the foundation of a tiny house. - now you can build any shed in a weekend even if youve zero woodworking experience! - now you can build any shed in a weekend even if you've zero woodworking experience!".