Adopted Codes

Overview

In the permitting of buildings, Williamson County uses the following editions of the International Building Code (IBC)

2021 EDITION OF THE INTERNATIONAL BUILDING CODE (IBC)

THE 2021 INTERNATIONAL RESIDENTIAL CODE (EXCLUDING SECTION B 313.2, ONE AND TWO DWELLING AUTOMATIC FIRE SPRINKLER SYSTEMS PURSUANT TO T.C.A. 68-120-101 (a)(8), AND CHAPTERS 34-43 RELATING TO ELECTRICAL),

THE 2021 INTERNATIONAL PLUMBING CODE

THE 2021 INTERNATIONAL MECHANICAL CODE

The 2021 INTERNATIONAL ENERGY CODE WITH THE 2009 TABLES IN ACCORDANCE WITH RULE 0780-02-23-.02 AS ADOPTED BY THE TENNESSEE STATE FIRE MARSHALS OFFICE. THE EFFECTIVE DATE OF THIS ADOPTION IS SEPTEMBER 1, 2023.

Note: Plans are not required to be designed by registered design professionals unless the project's complexity warrants otherwise. Buildings larger than this require plans to be developed by a registered design professional.

Additional Requirements

All Educational occupancies, Daycare facilities and large assembly occupancies must have plans approved by the Tennessee State Fire Marshals Office prior to permitting.