Make a dirt-floor lean-to as the simplest addition to a shed. set 4-by-4-inch posts at each end of the shed and as far out as you want the lean-to to extend; 6-to-8 feet is best. set center posts if the shed is 8 feet long or two intervening posts if it is longer.. Building a lean to shed, on the side of an existing shed. how-to build a budget board and batten style backyard garden shed using osb and construction lumber - duration: 14:52. andrew kavanagh. Building a lean to on my barn. hunting cabin built with free pallet wood pt.10 - mini cabin, pallet building, pallet shed complete - duration: 32:04. this life outdoors 263,076 views.