State Preemption of Local Zoning in Missouri
How Missouri state law overrides local zoning ordinances. ADU preemption, lot split preemption, and impact on city-level regulations.
What Is State Preemption?
State preemption occurs when a state law overrides local government ordinances in a specific area. In land use, preemption means a city or county cannot adopt zoning rules that are more restrictive than the state standard. If a city tries to prohibit something the state law permits, the state law wins.
Missouri has limited preemption in housing law. Local governments generally have broad authority to regulate land use within their jurisdictions, subject to state constitutional and statutory limits.
How Preemption Affects Missouri Cities
State preemption applies to every incorporated city and unincorporated area in Missouri. Select a city below to see how state preemption interacts with local zoning rules.
Source: Missouri State Law. Last verified April 5, 2026. View source