The California Moving and Storage Association (CMSA) is a non-profit trade association and has a website that represents over 300 insured and licensed movers operating in California. CMSA is a great resource for finding out the best practices and procedures for professional movers in California.
They Offer helpful information you should ask the mover and information you should find out before moving such as:
License
Estimate
Find prospective movers in your area
Carrier/Mover Liability
Price/Rates
Storage:
Not to Exceed Price:
Evaluate Service Presentations:
Visit the Mover:
CMSA is a huge resource if you need information about your potential mover. If you have a potential move it is a good idea to visit before picking a moving company.