With over 20 years of Construction experience, we are one of the leading residential remodeling services in Napa County, Contra Costa County and Solano County. Given the high cost of living, ADU construction has become a great way for families to generate additional income. All Bay Builders can build your ADU to your specification while adhering to all local and state codes. Architectural and structural drawings will be developed, submitted and approved prior to the start of any construction.