OS BUILDER operating as a corporation is licensed in California under CSLB number 1020394. The license was first issued in 2016, putting the business at 10 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 HARTFORD INSURANCE COMPANY OF THE MIDWEST and a previously-filed workers' compensation policy with STATE COMPENSATION INSURANCE FUND that is no longer active. The business is based in LAFAYETTE, in Contra Costa County, California.