Footing forms border the bottom of an open space into which concrete may be poured. The forms are adjustable to various widths and lengths, and further provide support for commercially available foam wall forms that are used in concrete wall construction. The combination of adjustable footing forms with foam wall forms allows wall and footing to be poured together to form a monolithic concrete structure. The footing forms are adjustable to work in association with various standard and non-standard widths of foamed resin wall forms used in the building construction industry. The footing forms are fully removable from the concrete monolith, while leaving the foam wall forms with the cast concrete. Various corner components are also illustrated.