Taragano Design and Build is proud to have earned the prestigious Diamond Certified award - rated Highest in Quality and Helpful Expertise among Bay Area contractors. diamondcertified.org/report/taragano-design-and-build/, Taragano Design and Build is Contra Costa County's premier full-service Design-Build firm, proudly serving Walnut Creek, Concord, Lafayette, Orinda, Danville, Pleasant Hill, San Ramon, Moraga, and the greater San Francisco Bay Area.