(a) The fire code applies only to the following buildings constructed in an unincorporated area of the county:
(1) a commercial establishment;
(2) a public building; and
(3) a multifamily residential dwelling consisting of four or more units.
(b) The fire code does not apply to an industrial facility having a fire brigade that conforms to requirements of the Occupational Health and Safety Administration.

(c) The fire code must:
(1) conform to:
(A) the International Fire Code, as published by the International Code Council, as the code existed on May 1, 2005; or
(B) the Uniform Fire Code, as published by the National Fire Protection Association, as the code existed on May 1, 2005; or
(2) establish protective measures that exceed the standards of the codes described by Subdivision (1).
(d) The commissioners court may adopt later editions of a fire code listed in Subsection (c).