(a) Before the expiration of a license, registration, or endorsement, a holder must:(1) submit a completed renewal application form;(2) obtain the required number of continuing education hours and/or training; and(3) pay the required fee(s).(b) Renewal application forms not completed by the licensee, registrant or endorsement holder's annual expiration date are considered late and are subject to late fees.(c) Late renewal applications will have an unlicensed period from the expiration date of the previous license, registration or endorsement to the issuance date of the renewed license, registration or endorsement. Plumbing work that requires a license, registration or endorsement issued under this chapter shall not be performed during the unlicensed period.