Cal. Bus. & Prof. Code § 2892.1
Except as provided in Sections 2892.3 and 2892.5, an expired license may be renewed at any time within four years after its expiration upon filing of an application for renewal on a form prescribed by the board, payment of all accrued and unpaid renewal fees, and payment of any fees due pursuant to Section 2895.1.
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 all renewal fees are paid, or on the date on which the delinquency fee is paid, whichever last occurs. If so renewed, the license shall continue in effect through the date provided in Section 2892 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 § 2892.1