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HSB 618

A bill for an act relating to county and city regulation of accessory dwelling units.

2025-2026 Regular Session

Iowa bill standardizing county and city regulations on accessory dwelling units to increase housing supply and affordability while limiting local zoning restrictions.

Committee report approving bill, renumbered as HF 2252.
#citygovernment #countygovernment #housing #realproperty
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Bill Summary · HSB 618

Legislative bill overview

HSB 618 would regulate how Iowa counties and cities can establish rules for accessory dwelling units (ADUs)—secondary residential structures on single-family properties like granny flats or converted garages. The bill aims to standardize or limit local zoning restrictions on ADUs across the state. This addresses the ongoing tension between local control over land use and state-level housing policy goals.

Why is this important

ADUs are increasingly viewed as a solution to housing affordability and supply shortages, particularly in tight rental markets. Many Iowa municipalities currently restrict or prohibit ADUs through zoning ordinances, limiting housing options and potentially driving up costs. State-level intervention could unlock thousands of additional housing units while affecting property values, neighborhood character, and local tax bases.

Potential points of contention

  • Local control vs. state mandate: Cities and counties traditionally control zoning; this bill may be seen as overriding municipal authority and community input on land-use decisions.
  • Housing supply vs. neighborhood character: ADU advocates argue they address shortages; opponents worry about increased density, parking issues, and impacts on established residential neighborhoods.
  • Property rights and taxation: Expanded ADUs could affect property tax assessments and existing homeowners' investments, while potentially benefiting developers and landlords seeking rental income.

Compiled from official sources — confirm details with the bill’s official record.

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