Cal. Bus. & Prof. Code § 7031.5
Each county or city which requires the issuance of a permit as a condition precedent to the construction, alteration, improvement, demolition or repair of any building or structure shall also require that each applicant for such a permit file as a condition precedent to the issuance of a permit a statement which he has prepared and signed stating that the applicant is licensed under the provisions of this chapter, giving the number of the license and stating that it is in full force and effect, or, if the applicant is exempt from the provisions of this chapter, the basis for the alleged exemption.
Any violation of this section by any applicant for a permit shall be subject to a civil penalty of not more than five hundred dollars ($500).
Ca. Bus. and Prof'l. Code § 7031.5