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Most sheds larger than six feet by eight feet require a foundation to remain level and dry. A compact tool shed might get by without one, but anything heavier should sit on at least a 4-inch-thick stone-and-gravel pad that extends two feet past the walls. The gravel protects wood skids and promotes drainage. If you want maximum stability—and your budget allows—a poured concrete slab is the strongest option.

Your ideal shed size hinges on purpose. A common 10-by-12-foot kit gives you 120 square feet—plenty for lawn tools and bikes. Need just a spot for a mower and a few rakes? A compact 4-by-7-foot model should work. If you’re envisioning a workshop or hobby room, look at 12-by-16 feet or larger.

A good rule is to raise the shed floor four to six inches above the surrounding soil. That clearance encourages water to drain away instead of pooling beneath the structure. The simple step is especially important for wood floors and skids, helping deter rot, mold, and insect damage while extending the life of your new outbuilding.

Choose the route that fits your goals. Prefab sheds arrive in standard layouts and go up fast—perfect for basic storage on a tight timeline. Custom builds cost more and take longer, but let you add windows, wiring, plumbing, and unique finishes. Balance budget, features, and timeframe before deciding which type of shed is best for your needs.