35 Pa. Stat. § 6700-312
Except as otherwise provided in this act, an expired registration certificate may be renewed at any time within five years after its expiration on filing of an application for renewal on a form prescribed by the secretary, payment of the renewal fee currently in effect and submitting evidence of completion of continuing education as provided in section 311. If the registration certificate is renewed more than 30 days after its expiration, the registrant, as a condition precedent to renewal, shall also pay the delinquency fee. Renewal under this section shall be effective on the date on which the complete application is filed, on the date on which the renewal fee is paid or whichever last occurs. If so renewed, the registration certificate shall continue in effect through the date provided in section 311 which next occurs after the effective date of the renewal, when it shall expire if it is not again renewed.
35 P.S. § 6700-312