ADU Rules in Missouri (2026)
ADU rules in Missouri — no statewide ADU law. Regulation is entirely local. Key provisions and city-specific frameworks for accessory dwelling units.
Law Name
Preempts Local Ordinances
No — local rules may be stricter
Has State Law
No — regulation is local
Statewide Preemption Status Unconfirmed
No statewide preemption statute was confirmed for this jurisdiction — regulation is local. Local governments retain full authority to set their own rules.
Local Control Framework
Missouri does not have a statewide ADU law as of 2026 · Source
ADU regulation is left entirely to local municipalities · Source
Missouri Revised Statutes Chapter 89 (Zoning) grants municipalities authority over local zoning and land use · Source
Kansas City (MO), St. Louis, Springfield, and Columbia set their own local ADU ordinances · Source
Missouri has not enacted statewide housing preemption legislation as of 2026 · Source
Kansas City MO and St. Louis have been exploring housing density and ADU provisions through local zoning code updates · Source
Source: Missouri Local Zoning Authority. Last verified April 5, 2026. View source