Cal. Bus. & Prof. Code § 1718
Except as otherwise provided in this chapter, an expired license may be renewed at any time within five years after its expiration on filing of application for renewal on a form prescribed by the board, and payment of all accrued renewal and delinquency fees. If the license is renewed more than 30 days after its expiration, the licensee, as a condition precedent to renewal, shall also pay the delinquency fee prescribed by this chapter. Renewal under this section shall be effective on the date on which the application is filed, on the date on which the renewal fee is paid, or on the date on which the delinquency fee, if any, is paid, whichever last occurs. If so renewed, the license shall continue in effect through the expiration date provided in Section 1715 which next occurs after the effective date of the renewal, when it shall expire if it is not again renewed.
Ca. Bus. and Prof'l. Code § 1718