Okla. Admin. Code § 748:20-8-15
Chapter 10 of the Oklahoma adopted IEBC® 2018 is adopted with the following modification: Section 1001.2.1 Change in use. This section has been modified to address errata published by the ICC®. The modification changes a reference in the section from Chapter 5 to Chapter 6. This section has been modified to read: 1001.2.1 Change in use. Any work undertaken in connection with a change in use that does not involve a change of occupancy classification or a change to another group within an occupancy classification shall conform to the applicable requirements for the work as classified in Chapter 6 and to the requirements of Sections 1002 through 1010. Exception: As modified in Section 1204 for historic buildings.
Okla. Admin. Code § 748:20-8-15