About Con-Fab Con-Fab California Corporation is a manufacturer of structural precast, prestressed concrete located in Lathrop, California. A privately held company, Con-Fab was founded in 1976 in Hawaii, and expanded to California in 1984. Con-Fab has furnished the components for and has erected numerous structures throughout California, Hawaii and the Pacific Basin. Con-Fab manufactures precast components for bridges, both public and private ; industrial and commercial buildings ; parking structures ; theaters ; commercial wine cellars and underground cold storage ; and office and apartment buildings. Con-Fab California opened in San Jose in 1984. In 1985, Con-Fab moved to a 20 acre facility in Lathrop. .