A shed is a convenient addition to any property that helps to keep clutter and tools out of your living space while still protecting them from theft and the elements. Building a shed on a stable foundation will help to prolong its life and keep it from shifting and affecting the functionality of doors and windows.
Cement blocks set firmly onto solid ground can create an adequate base for a small shed. The smaller the footprint of the shed, the more likely it is that any shifting of the ground will move the entire shed as a unit, minimizing any torque, wracking or damage that might occur to the structure. Concrete blocks should be laid so that their tops are level, which can be easily accomplished by stretching a string between the blocks and putting a line level on the string. You can then dig small holes for the blocks that are too high, lowering them until all of the blocks are level.
Sonotubes will create a shed foundation that is substantially more stable and durable than concrete blocks. This method is more appropriate for larger buildings and for construction in areas with severe cold where the ground will freeze and move. A sonotube is a round cardboard tube that is set into a hole in the ground and filled with concrete to create a strong pillar. The base of the sonotube should be below the frost line or set directly onto bedrock. Sonotubes should be installed so they are perfectly vertical, thus maximizing the stability of the shed.
A concrete slab will provide a very strong basis for a shed and also remove the need for building a floor out of wood or some other material. The concrete slab can be built directly onto the ground by laying forms that will hold the concrete in the desired shape while it dries. The perimeter of the concrete should be thicker than the rest of the slab, providing added support for walls and rigidity for the slab itself. The resulting concrete floor needs to be above ground level to prevent flooding.
Pressure Treated Wood
Pressure treated wood can create an adequate foundation for a small shed, although it is not as durable as concrete. Pressure-treated 8 x 8-inch posts can be set into the ground using the same method as sonotubes. Using wood is less expensive and less labor intensive than working with concrete, but even when pressure-treated, wood that is in contact with the ground will eventually rot.
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