10x20 shed plans - large sheds with plenty of storage and work space. if you need a big shed that is narrow compared to its length the 10x20 shed size may be your solution. the 10x20 shed size is plenty big enough to store a lawn tractor and still leave lots of room for a workshop or storage space.. The 10x20 gable storage shed plan comes with easy to understand, step by step instructions for diy newbies. don’t worry if you don’t have any experience in building wooden structures. the plan you take you through without any complication jargons.. 10x20 shed with 10x20 lean-to, 10x10 loft, 8x8 roll-up door, 6 panel steel door, window, 10' sidewalls and 8' ramp. http://www.stoutsheds.com/shedplans.