From Consumer Wiki
Businesses that sell but do not install carpet must have a local city or county business license. Installers must be licensed by the California Department of Consumer Affairs, Contractors State Licensing Board (CSLB). These businesses must have a local city or county business license.
Contractors State Licensing Board
9821 Business Park Drive
Sacramento, CA 95827
The Better Business Bureau (BBB) records complaints for manufacturers and carpet sales people.
Department Publications: None are offered by the Consumer Information Center
Other References: Carpet (Cleaners)
Other Referrals: Better Business Bureau, Small Claims Court, and Civil Resolution