House Bill 1720, also known as Senate Bill 1771, amends Tennessee Code Annotated to restrict municipalities and regional planning commissions from adopting zoning plans or ordinances that govern areas outside their municipal boundaries. Specifically, the bill introduces a new section that states such zoning regulations will be void and unenforceable if a county legislative body adopts a resolution by majority vote. This provision allows for the possibility of interlocal agreements between counties and municipalities to manage ongoing development or land use obligations that were in place before the resolution was adopted.

The bill applies to counties with populations under 341,500, as per the 2020 federal census, and explicitly excludes counties with a metropolitan form of government. Additionally, it clarifies that counties and municipalities are still permitted to enter into interlocal agreements for lawful purposes under state law. The act is set to take effect immediately upon becoming law, emphasizing the urgency of the public welfare.