MASON MECHANICAL SERVICES operating as a sole owner is licensed in California under CSLB number 692130. The license was first issued in 1994, putting the business at 32 years on the active CSLB roster. It carries a single CSLB classification: C-20 — HVAC Contractor. Records show an active surety bond on file with AMERICAN CONTRACTORS INDEMNITY COMPANY and active workers' compensation coverage from AMERICAN CASUALTY COMPANY OF READING PA. The business is based in NOVATO, in Marin County, California.