If you are a contractor in California you will need to carry contractors insurance. This insurance covers you as you work in consumer homes and businesses. It is mandatory but you can shop around for the best rates for your company.
Many insurance companies carry contractors insurance so it is important to do your research and compare all available policies. Some carry different deductible amounts and rates so be sure to compare all aspects of the insurance policies so that you are confident that you are getting the best policy possible.
Ask for references from friends, family, and business partners if you are not sure which insurance company to use.
Many times you can benefit from the research they have already done. More info: california contractors insurance