ADU Laws in Missouri (2026)
Missouri state ADU law details, key provisions, preemption status, and recent legislative changes for accessory dwelling units.
Law Name
State ADU Law
Preempts Local Ordinances
No — local rules may be stricter
Has State Law
Yes
Key Provisions
Missouri does not have a statewide ADU law as of 2026
ADU regulation is left entirely to local municipalities
Missouri Revised Statutes Chapter 89 (Zoning) grants municipalities authority over local zoning and land use
Kansas City (MO), St. Louis, Springfield, and Columbia set their own local ADU ordinances
Missouri has not enacted statewide housing preemption legislation as of 2026
Kansas City MO and St. Louis have been exploring housing density and ADU provisions through local zoning code updates
Official Sources
Source: Missouri State ADU Law. Last verified April 5, 2026. View source