UNDERWOOD WILLIAM CONSTRUCTION operating as a sole owner is licensed in California under CSLB number 686123. The license was first issued in 1994, putting the business at 32 years on the active CSLB roster. It carries a single CSLB classification: B — General Building Contractor. Records show an active surety bond on file with BUSINESS ALLIANCE INSURANCE COMPANY and active workers' compensation coverage from BENCHMARK INSURANCE COMPANY. The business is based in COTATI, in Sonoma County, California.