S.D. Codified Laws § 36-4C-12
The license of every person licensed under the provisions of this chapter shall be renewed biennially. The expiration date shall be established by the board. The board shall mail a notice for renewal of license to the last known address of each licensee currently licensed, at least ninety days prior to the expiration date of the license. The licensee shall return the notice with the required fee to the board before the expiration date. Upon receipt of the notice and fee, the board shall issue to the licensee a certificate of renewal. Failure to receive the notice for renewal of license does not relieve the licensee of the responsibility for renewing the license and paying the renewal fee within the prescribed time. Failure of a licensee to renew the license constitutes a forfeiture of such license. However, any person who has forfeited a license under this chapter may have it restored by making written application and payment of the biennial renewal fee and the late renewal fee. Late renewal of a license may not be granted more than one year after its expiration. The board may establish, by rule, promulgated pursuant to chapter 1-26, requirements for continuing education or retesting for any person who has not been licensed for a continuous period of time greater than one year. The board may establish additional requirements for license renewal which may include evidence of continuing competency.
SDCL 36-4C-12