A prefabricated building includes a sheet folded to form a structural member defining an interior space. The structural member defines an upper guide hole that extends from the interior space of the structural member to the exterior of the structural member, and a lower guide hole that extends from the interior space of the structural member to the exterior of the structural member. The prefabricated building also includes a guide member that is fixed relative to a foundation. The structural member is aligned so that the guide member passes through the upper guide hole and the lower guide hole.