Codes - As enacted, requires the statewide building construction safety standards to allow a local government to amend the adopted building code for three-family dwellings and four-family dwellings in accordance with the standards; provides that, in amending the rules, the state fire marshal must not mandate automatic fire sprinkler systems for three-family dwellings and four-family dwellings where structures are under 5,000 square feet in area and meet other criteria; authorizes local governments to mandate sprinklers if certain conditions are met. - Amends TCA Title 68, Chapter 120.

This bill allows local governments in Tennessee to update their building codes to include specific safety rules for three-family and four-family dwellings. Under the new rules, the state fire marshal cannot require automatic fire sprinklers in these buildings if they are under 5,000 square feet and have walls, floors, and ceilings that meet a two-hour fire-resistance rating. However, the bill also gives local communities the option to pass their own ordinances that do require sprinklers in these types of homes if they choose to do so. The changes take effect on July 1, 2024, and apply to residential structures that fall outside the current scope of the state's standard residential building code.