Cal. Bus. & Prof. Code § 7151.2
"Home improvement contract" means an agreement, whether oral or written, or contained in one or more documents, between a contractor and an owner or between a contractor and a tenant, regardless of the number of residence or dwelling units contained in the building in which the tenant resides, if the work is to be performed in, to, or upon the residence or dwelling unit of the tenant, for the performance of a home improvement as defined in Section 7151, and includes all labor, services, and materials to be furnished and performed thereunder. "Home improvement contract" also means an agreement, whether oral or written, or contained in one or more documents, between a salesperson, whether or not he or she is a home improvement salesperson, and (a) an owner or (b) a tenant, regardless of the number of residence or dwelling units contained in the building in which the tenant resides, which provides for the sale, installation, or furnishing of home improvement goods or services.
Ca. Bus. and Prof'l. Code § 7151.2