The present invention provides a system or kit of connectors and panels which can be readily assembled to form a structure with the use of a minimal number of tools. Panels are precut so that measurements and cutting of the panel component materials is eliminated. Connectors are provided for attachment to the panels which allow the panels to be assembled to the floor and roof panels without the need for fasteners. The roof and floor structures are formed from interlocking plastic panels. The roof and floor panels include a structure that cooperates with the connectors secured to the wall panels to allow for the construction of a plurality of structures using like constructed connectors. Wall panels may be chosen from a variety of materials which allow a consumer to construct a building such as a storage shed that best suits his/her needs.