Abstract: The present invention foundation kit is generally comprised of prefabricated modular components and hardware, which can be used for easily and efficiently constructing a foundation for a moderately sized building such as a house. In another aspect, the present invention kit can be seen as embodying a variety of optional modular components that can be used for constructing steps, landings, and/or decks. In still another aspect the present invention can be seen from the perspective of the methods used in fabricating the components of the kit and for constructing a significant portion of a building from the kit including the kit's associated optional components. In another embodiment the kit is designed to have prefabricated modular wall panels that could be used in the construction of a building having a concrete slab base or foundation.