Cal. Bus. & Prof. Code § 7026.1

(a) The term “contractor” includes all of the following:
1. (1) Any person not exempt under Section 7053 who maintains or services air-conditioning, heating, or refrigeration equipment that is a fixed part of the structure to which it is attached.
2. (2)
  1. (A) Any person, consultant to an owner-builder, firm, association, organization, partnership, business trust, corporation, or company, who or which undertakes, offers to undertake, purports to have the capacity to undertake, or submits a bid to construct any building or home improvement project, or part thereof.
  2. (B) For purposes of this paragraph, a consultant is a person, other than a public agency or an owner of privately owned real property to be improved, who meets either of the following criteria as it relates to work performed pursuant to a home improvement contract as defined in Section 7151.2:
    1. (i) Provides or oversees a bid for a construction project.
    2. (ii) Arranges for and sets up work schedules for contractors and subcontractors and maintains oversight of a construction project.
3. (3) A temporary labor service agency that, as the employer, provides employees for the performance of work covered by this chapter. The provisions of this paragraph shall not apply if there is a properly licensed contractor who exercises supervision in accordance with Section 7068.1 and who is directly responsible for the final results of the work. Nothing in this paragraph shall require a qualifying individual, as provided in Section 7068, to be present during the supervision of work covered by this chapter. A contractor requesting the services of a temporary labor service agency shall provide his or her license number to that temporary labor service agency.
4. (4) Any person not otherwise exempt by this chapter, who performs tree removal, tree pruning, stump removal, or engages in tree or limb cabling or guying. The term contractor does not include a person performing the activities of a nurseryperson who in the normal course of routine work performs incidental pruning of trees, or guying of planted trees and their limbs. The term contractor does not include a gardener who in the normal course of routine work performs incidental pruning of trees measuring less than 15 feet in height after planting.
5. (5) Any person engaged in the business of drilling, digging, boring, or otherwise constructing, deepening, repairing, reperforating, or abandoning any water well, cathodic protection well, or monitoring well.
(b) The term “contractor” or “consultant” does not include a common interest development manager, as defined in Section 11501, and a common interest development manager is not required to have a contractor’s license when performing management services, as defined in subdivision (d) of Section 11500.