California Code, Business and Professions Code - BPC § 5800

(a) “Certified * * * Interior Designer” means a person who prepares and submits nonstructural or nonseismic plans consistent with Sections 5805 and 5538 to local building departments that are of sufficient complexity so as to require the skills of a licensed contractor to implement them, and who engages in programming, planning, designing, and documenting the construction and installation of nonstructural or nonseismic elements, finishes and furnishings within the interior spaces of a building, and has demonstrated by means of education, experience and examination, the competency to protect and enhance the health, safety, and welfare of the public.

(b) An “interior design organization” means the California Council for Interior Design Certification (council), a nonprofit organization that is exempt from taxation under Section 501(c)(3) of Title 26 of the United States Code, and consists of Certified Interior Designers whose governing board includes representatives of the public.