Iowa Code Chapter 414 — City Zoning Enabling Act (IA)
Tracked preemption from the Iowa overlay bundle.
Overview
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Effective
1924-01-01
Sunset
—
Authority
state
Scope
state:IA
Other Iowa preemptions
Iowa SF 592 (2025) — Statewide Accessory Dwelling Unit By-Right MandateIowa Code §414.1(2) — Short-Term Rental Preemption (Residential Use Classification)Iowa Code §459.310 — Master Matrix CAFO Siting ScorecardIowa Code Ch. 161D — Loess Hills Development and Conservation Authority + AllianceIowa Code §414.28 / §335.30 — Manufactured Home Zoning Parity MandateIowa Code Ch. 303 — State Historical Society / SHPO Review + Local Historic Preservation CommissionsIowa Code §352.6 — Agricultural Area Designation + Right-to-Farm Nuisance ProtectionIowa Code Ch. 455B + 567 IAC 71 — Floodplain Development Approval (DNR Flood Plain Program)
Primary-source summary
Iowa Code Chapter 414 — City Zoning Enabling Act (Marquee)Trigger predicate
When this evaluates true for a parcel, the law's preempted fields take precedence over base zoning.
city.governance_type == municipal_corporationPreempted fields
2 fields on the base district schema are rewritten when the trigger fires.
| Field | Op | Value | Note |
|---|---|---|---|
zoning_ordinance.procedural_floor | require | ch_414_compliant | Cities exercising zoning authority must satisfy Chapter 414 procedural floors: comprehensive-plan basis (§414.3), zoning commission for initial adoption (§414.6), public hearing + notice for ordinance amendments (§414.4–.5), board of adjustment with statutory powers (§414.7–.15), 20%-of-adjoining-landowner protest petition triggering supermajority vote (§414.22), and existing-use nonconforming-use floor (§414.23). |
zoning_ordinance.purpose_clause | require | health_safety_morals_general_welfare | Section 414.1(1) anchors the police-power purpose — height/stories/size, lot coverage, yards, density, and use regulation must be tied to health, safety, morals, and general welfare. |
Citation
Authority source
Iowa Code ch. 414 (City Zoning) — Iowa Const. Art. III §38A (Municipal Home Rule) is the constitutional anchor; Ch. 414 is the procedural channel.
§ §§414.1 through 414.28A
Research notes
Procedural framework overlay. Iowa is a strong Home Rule state (Iowa Const. Art. III §38A); Dillon's Rule is abolished. Chapter 414 does not preempt substantive zoning fields directly, but a municipal ordinance that does not satisfy the procedural floor is procedurally void. Cross-reference ISU Extension's 'An Explanation of Chapter 414' for the canonical commentary. Within municipal corporate limits, city zoning prevails over county zoning per Art. III §39A.