Most shed foundations benefit from a gravel layer four to six inches deep after proper compaction. The exact depth may vary depending on your specific soil conditions, climate, and shed weight. In areas with poor drainage or for heavier structures, contractors might recommend slightly deeper installations. Building the pad in multiple compacted layers rather than a single thick pour helps achieve optimal stability and load distribution.
Gravel pads cost significantly less than concrete foundations. While gravel materials run about $1.25 to $1.80 per square foot, concrete slabs average $6 per square foot. For a standard shed base, this price difference translates to substantial savings. Beyond the initial cost advantage, gravel pads also offer easier installation, simpler modifications if needed, and don't require specialized concrete finishing skills.
For a standard 10-by-12 shed pad, you'll need enough gravel to cover 120 square feet at the recommended depth. At rates of $1.25 to $1.80 per square foot, expect to spend $150 to $216 on gravel materials alone. Remember to factor in extending the pad beyond the shed's dimensions by one to two feet on each side for better drainage and stability, which increases the actual area needed.
The ideal gravel for shed foundations combines stability with proper drainage capabilities. Crusher run ($0.40 per square foot) makes an excellent base layer because it contains various particle sizes that lock together when compacted. For top layers, angular gravel provides better drainage while maintaining stability. Avoid perfectly round decorative stones as they don't compact effectively and may shift under weight, compromising your shed's stability over time.