California Code, Business and Professions Code - BPC § 7162

(a) Notwithstanding any other provision of law, any representation by a person licensed pursuant to this chapter with respect to a trademark or brand name, quality, or size of any goods or materials, in reference to bathroom fixtures, a sink, stove, refrigerator, lighting, carpeting and other floor surfaces, burglar and smoke alarms, a solar energy system, paints, textured coatings, siding and other wall surfaces, insulation, roofing, air conditioning and heating systems, and appliances, to be provided by the person pursuant to a home improvement contract, as defined in Section 7151.2, shall set forth, in writing, in the contract or specifications and shall include a description of the goods or materials, including any brand name, model number, or similar designation.

(b) Failure to install the specific goods or materials as represented as required by this section constitutes a cause for disciplinary action under this chapter.