Cal. Pub. Util. Code § 2785
Upon approval of an application, the corporation shall arrange for a licensed contractor to perform the necessary work. Upon approval of an estimate by the customer and the corporation, the corporation shall direct the work to commence. All attic insulation installations shall meet or exceed requirements applicable at the time of installation or as may be established for existing residential structures, except where such compliance is impossible or impractical in an existing structure and an alternative method or procedure providing satisfactory results is available. The corporation shall arrange for inspection of a representative portion of the work performed pursuant to this chapter. As used in this section, the term "attic" means any air spaces between the ceiling and roof of a residential dwelling which are accessible for the purpose of the installation of insulation.
Ca. Pub. Util. Code § 2785