The plans below will guide you on how to build a 10’x14’ shed. These free shed plans show you how to build a shed with T1-11 sheathing. You can also use vinyl or metal siding if you wish.
These are way better than most prefab sheds. Most shed builders are out to save cost and they cut corners by using 2×3 lumber instead of 2×4 lumber. They use 2×4 joists instead of 2×6 or 4×4 joists. They frame walls 24″ on center instead of 16″ on center and they often skimp on the shed doors.
These plans are rock solid and your shed will last a very long time.