For the purpose of classification, the contracting business includes any or all of the following branches:

(a) General engineering contracting.

(b) (1) General building contracting.

(2) Residential remodeling contracting.

(c) Specialty contracting.

(Amended by Stats. 2020, Ch. 364, Sec. 2. (SB 1189) Effective January 1, 2021.)