Relating to the residential and commercial building codes of municipalities.

HB 306 adopts the 2018 International Residential Code for residential buildings and the 2018 International Building Code for commercial buildings in Texas municipalities. It specifically allows agricultural operations (like farms) to follow the 2012 version of these codes for related structures. The bill requires municipalities to implement these codes by January 1, 2027, and applies only to new construction, remodeling, or repairs starting on or after that date. This directly affects local governments, builders, and property owners in residential and commercial development across Texas.