De Mattei Construction was formed in 1985, as one of the commercial builders helping lead the revitalization of downtown San Jose, Calif., and its landmark buildings. In the 1990s, the firm shifted its focus to residential remodeling and custom home building. The company has built and remodeled more than 1,000 of quality homes in the California. It ranks among the largest residential remodelers in the United States and is one of the fastest growing private companies in Silicon Valley, Calif. De Mattei Construction is headquartered in San Jose, Calif. .