California Code, Public Resources Code - PRC § 25953

(a) “Person” means any individual, partnership, corporation, limited liability company, association, manufacturer, distributor, retailer, contractor or builder as defined in Section 7026 of the Business and Professions Code, or other groups, however organized, who sell or cause to be distributed or installed, any new gas appliance as defined in Section 25950.

(b) “Manufacturer” means any individual, partnership, corporation, association, or other legal relationship that manufactures, assembles, produces, or gathers consumer goods.

(c) “Distributor” means any individual, partnership, corporation, association, or other legal relationship that stands between the manufacturer and the retail seller in purchases, consignments, or contracts for sale of consumer goods.

(d) “Retail seller,” “retail outlets,” “seller,” or “retailer” means any individual, partnership, corporation, association, or other legal relationship that engages in the business of selling new goods to retail buyers.

(e) “Contractor” for the purpose of this chapter is synonymous with the term “builder” and, within the meaning of this chapter, a contractor is any person who undertakes to or offers to undertake to or purports to have the capacity to undertake to or submits a bid to, or does themselves or by or through others, construct, alter, repair, add to, subtract from, improve, move, wreck, or demolish any building, highway, road, parking facility, railroad, excavation, or other structure, project, development, or improvement, or to do any part thereof, including the erection of scaffolding or other structures or works in connection therewith. The term “contractor” includes subcontractor and specialty contractor.