In cold climates with the possibility of freezing, use a concrete footer or posts in concrete. Use 2-by-6-inch floor joist lumber to build the outer band of the base frame.

Some precast concrete foundation systems are routinely installed without a poured concrete footer. They rest on compacted gravel that acts as a footer.

I'd like to build a wood shed to hold firewood. I'd like to build a raised structure supported on concrete blocks or some other kind of foundation, if possible. Traditionally, people either just ...