RSMo Chapter 89 — Municipal Zoning Enabling Act (Standard State Zoning Enabling Act derivative) (MO)
Tracked preemption from the Missouri overlay bundle.
Overview
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Effective
1925-01-01
Sunset
—
Authority
state
Scope
state:MO
Other Missouri preemptions
RSMo §89.020.2 — Manufactured-Home Appearance-Criteria Preemption (Permissive-Enabling)RSMo §§ 447.700–447.718 — Missouri Brownfield Redevelopment ProgramMissouri CAFO Regulation — 10 CSR 20-6.300 (MDNR Concentrated Animal Feeding Operations)RSMo §§ 99.800–99.865 — Real Property Tax Increment Allocation Redevelopment ActRSMo §§ 305.400–305.410 — Greene County Airport Zoning Law (Springfield-Branson Region)RSMo § 253.408 — Missouri State Historic Preservation Act (SHPO)Mark Twain National Forest — USFS Adjacency & Land-Use Coordination OverlayMissouri Floodplain Management — SEMA NFIP Coordination + MDNR 10 CSR 20-8
Trigger predicate
When this evaluates true for a parcel, the law's preempted fields take precedence over base zoning.
city.city_class ∈ {charter, third_class, fourth_class, town, village, constitutional_charter_county, consolidated_st_louis_city}Preempted fields
4 fields on the base district schema are rewritten when the trigger fires.
| Field | Op | Value | Note |
|---|---|---|---|
zoning_ordinance.procedural_floor | require | rsmo_89_compliant | Zoning ordinance must follow §89.040 'in accordance with a comprehensive plan' standard and §89.050 procedural floor (15-day published notice, public hearing, two-thirds supermajority where a protest petition is filed). |
zoning_ordinance.rezoning_protest_petition_supermajority | require | two_thirds_of_legislative_body | §89.060: protest petition by owners of ≥30% of area within the proposed change OR ≥30% of area within 185 feet triggers two-thirds legislative-body supermajority for adoption. |
zoning_decision_procedure.board_of_adjustment_required | require | True | §§89.080–89.110: every zoned municipality must establish a board of adjustment with authority over variances, special exceptions, and administrative appeals; certiorari review to circuit court. |
base_districts[category=res_sf].allowed_uses | add | group_home_8_or_fewer_disabled_persons | §89.145: municipalities may not prohibit group homes of ≤8 unrelated persons with disabilities in any single-family residential district; parallels and codifies federal Fair Housing Act anti-discrimination floor. |
Citation
Authority source
Mo. Rev. Stat. ch. 89 (Zoning and Planning) — operative grant §89.020; comprehensive-plan standard §89.040; procedural floor §89.050; rezoning protest petition §89.060; board of adjustment §§89.080–89.110; group-home preemption §89.145
§ §§89.010 through 89.491
Research notes
Standard State Zoning Enabling Act lineage (modeled on Hoover Commission 1924 SSZEA). The task brief cited §89.010 et seq. — §89.010 is the applicability/conflict provision and §89.020 is the operative grant of power. Chapter 89 applies to all municipalities; constitutional-charter cities (Mo. Const. Art. VI §19(a)) layer additional home-rule authority on top but cannot override Chapter 89's procedural floor or §89.145's group-home anti-exclusion. Counties zone unincorporated areas under the parallel Chapter 64 regime (split by county class). Chapter 89 contains no statewide density, FAR, height, or use-by-right preemption — Missouri remains a strong home-rule state and has not enacted a counterpart to CA SB 9/10, FL Live Local, or TX SB 840 as of 2026-05-18.