The answer to this question also depends on the shed’s size. Full-sized units can be as big as a two-story house, providing enough space inside to keep vehicles, old furniture, tools, and heavy machines or equipment.
A shed that is designed that big might require a foundation, especially if you live in an area with seasonal hurricanes, storms, and tornados, so we suggest building a sturdy and reliable shed from the beginning.
However, not all full-sized sheds are built with a foundation, especially when we’re talking about metallic or wooden structures. Most of them are built directly on the ground so that they can be easily demolished when needed and rebuilt.
As for plastic outdoor storage sheds, many of them are the size of cabinets or closets, so there is no need for a foundation. They are lightweight and portable, which means you can place them anywhere you want in your garden, depending on your needs.