We built the colonial-style garden shed shown here from a set of mail-order building plans. the 10 x 16-ft. outbuilding has easy-to-install plywood siding, three large windows and two pairs of doors.. The size of your shed can vary quite considerably, but always consider the area you have and how you can best utilize it. sometimes it make sense to build vertically rather than horizontally, especially when it comes to storage. finally and most importantly, cost is a huge factor in building your backyard shed and finding the right plans for it.. Backyard shed plans. while all of our shed plans are designed to be build in a backyard, this collection of plans represents a few of our more simple designs. they are are designed to be easy to build while keeping the use of materials to a minimum without sacrificing build quality..