Abstract: A pre-fabricated building foundation form assembly is installed beneath a pre-existing temporarily supported structure in its final position, and a footing dug below the line of the lowest building timber. A rigid sheet form element is positioned along the upper and outside perimeter side portion of the lowest building timber. The brackets are positioned over the lowest timber and against the sheeting at specified intervals and held in place with connectors. Adjustable supports are attached to the brackets and connectors attach brackets to sheeting. J-bolts along with structural steel are installed. A rigid sheet form element is laterally positioned along the inside perimeter of the inner side of the brackets and held with connectors, which completes the suspended enclosure.