Enabling statute

Iowa

Iowa Code Title IX (Local Government), Chapter 414 — City Zoning, and Chapter 335 — County Zoning (Standard State Zoning Enabling Act lineage)

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Summary

Iowa delegates zoning authority to its local governments rather than zoning at the state level, following the Standard State Zoning Enabling Act model. Cities derive their power from Iowa Code Chapter 414, with the core grant in §414.1 empowering "any city" to regulate the height, bulk, density, and use of buildings, structures, and land for the public health, safety, morals, and general welfare. Counties derive their power from Iowa Code Chapter 335, which applies to a county only "at the option of the board of supervisors" (§335.1); §335.3 grants the board the parallel power to regulate by ordinance, but only as to unincorporated land lying outside any city's corporate limits. County zoning notably exempts most agricultural land, farm houses, and farm structures while so used (§335.2). The two chapters together create a county-and-municipal authority model with strong local home-rule discretion.

The delegation

CHAPTER 414 — CITY ZONING §414.1 Building restrictions — powers granted — rental properties — consumer fireworks. 1. a. For the purpose of promoting the health, safety, morals, or the general welfare of the community or for the purpose of preserving historically significant areas of the community, any city is hereby empowered to regulate and restrict the height, number of stories, and size of buildings and other structures, the percentage of lot that may be occupied, the size of yards, courts, and other open spaces, the density of population, and the location and use of buildings, structures, and land for trade, industry, residence, or other purposes. CHAPTER 335 — COUNTY ZONING §335.1 Where applicable. The provisions of this chapter shall be applicable to any county of the state at the option of the board of supervisors of any such county. §335.3 Powers. 1. Subject to section 335.2, the board of supervisors may by ordinance regulate and restrict the height, number of structures, and size of buildings and other structures, the percentage of lot that may be occupied, the size of yards, courts, and other open spaces, the density of population, and the location and use of buildings, structures, and land for trade, industry, residence, or other purposes, and may regulate, restrict, and prohibit the use for residential purposes of tents, trailers, and portable or potentially portable structures. However, such powers shall be exercised only with reference to land and structures located within the county but lying outside of the corporate limits of any city. §335.2 Farms exempt. 1. Except to the extent required to implement section 335.27, no ordinance adopted under this chapter applies to land, farm houses, farm barns, farm outbuildings, or other buildings or structures that are primarily adapted, by reason of nature and area, for use for agricultural purposes, while so used. However, the ordinances may apply to any structure, building, dam, obstruction, deposit, or excavation in or on the floodplains of any river or stream.

Verification

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Verified against the official Iowa Legislature statute PDFs (Iowa Code 2026). (a) Real, current statutes: Both chapters exist in current Iowa Code (2026 edition), Title IX (Local Government). Confirmed via legis.iowa.gov official PDFs. (b) Genuine zoning enabling authority: - Iowa Code §414.1 (Chapter 414, City Zoning): "For the purpose of promoting the health, safety, morals, or the general welfare of the community... any city is hereby empowered to regulate and restrict the height, number of stories, and size of buildings and other structures, the percentage of lot that may be occupied, the size of yards, courts, and other open spaces, the density of population, and the location and use of buildings, structures, and land for trade, industry, residence, or other purposes." This is the verbatim Standard State Zoning Enabling Act grant. Matches claim. - Iowa Code §335.1 (Chapter 335, County Zoning): "The provisions of this chapter shall be applicable to any county of the state at the option of the board of supervisors of any such county." Matches the claim's optional/local-discretion characterization exactly. (Codified from former §358A.1.) - §335.2 (Farms exempt): confirmed — exempts land, farm houses, farm barns, farm outbuildings, and structures primarily adapted for agricultural use, while so used (with floodplain exception). Matches. - §335.3 (Powers): confirmed — board of supervisors may by ordinance regulate height/size/lot coverage/yards/density/use, but only as to land within the county lying outside the corporate limits of any city. Matches. (c) authority_model = county_and_municipal is accurate: Chapter 414 empowers cities, Chapter 335 empowers counties (over unincorporated land), with strong local home-rule discretion. Both real, current, and not repealed. Minor note (not an error): claim's word "bulk" in the §414.1 summary is a paraphrase; the statute uses "size of buildings"/"percentage of lot that may be occupied," which is the standard bulk concept. The "Standard State Zoning Enabling Act lineage" label is accurate given the verbatim SZEA language.