A 14 x 18 shed building is a fantastic addition to any backyard Use this 14 x 18 shed as a potting shed, she shed, workshop, or retreat. These 14 x 18 sheds have plenty of vertical storage space and easy to assemble paneled wall sections save you build time, as does the included hardware. A 14 x 18 shed can stand adjacent to the side of a house or fence, inside a garage or even in a basement for extra storage space.