California Code, Business and Professions Code - BPC § 7026.1

(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.

(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) 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) 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.