California Code, Civil Code - CIV § 1689.8

(a) Every home solicitation contract or offer for home improvement goods or services which provides for a lien on real property is subject to the provisions of Chapter 1 (commencing with Section 1801) of Title 2 of Part 4 of Division 3.

(b) For purposes of this section, “home improvement goods or services” means goods and services, as defined in Section 1689.5, which are bought in connection with the improvement of real property.  Such home improvement goods and services include, but are not limited to, burglar alarms, carpeting, texture coating, fencing, air conditioning or heating equipment, and termite extermination.  Home improvement goods include goods which, at the time of sale or subsequently, are to be so affixed to real property as to become a part of real property whether or not severable therefrom.