Section I. The California Contractor License. Below is a guide to Contractor License Law in California ("CCLL") designed to help contractors quickly navigate certain statutes along with the full legal text.There's only one requirement applicable to all construction contracts in California. California Code Sections 895 et seq. Are known as the "Contractor's Right to Repair Law. It's required to have a minimum 15′ front setback, 5′ minimum setbacks and 20′ rear setbacks. The setbacks are measured from the property lines. Construction-defect cases in California are expected to rise in the coming years due to several factors. In California public works construction, staying compliant with state regulations is just as critical as pouring a solid foundation. Changes to Home Improvement Contract Requirements in Effect January 1, 2021.