Cal. Bus. & Prof. Code § 6796
Except as otherwise provided in this article, certificates of registration as a professional engineer and certificates of authority may be renewed at any time within five years after expiration on filing of application for renewal on a form prescribed by the board and payment of all accrued and unpaid renewal fees. If the certificate is renewed more than 60 days after its expiration, the certificate holder, 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.
The expiration date of a certificate renewed pursuant to this section shall be determined pursuant to Section 6795.
Ca. Bus. and Prof'l. Code § 6796