Adds to existing law to establish provisions regarding regulation of twin homes and duplexes.
Senate Bill 1353 would limit local government authority over twin homes and duplexes in Idaho cities with populations over 10,000. The bill prohibits cities from banning twin homes or duplexes in residential zones where single-family homes are allowed, and requires cities to update comprehensive plans and land use regulations by February 1, 2027, to allow these housing types on lots where detached single-family dwellings are permitted, subject to specified exceptions and standards.
The bill also restricts cities from using minimum lot sizes, parking requirements, impact fees, or utility connection fees in ways that would effectively block twin homes or duplexes. It requires qualifying projects to be approved administratively and as a matter of right, unless there are infrastructure, emergency access, or fire code conflicts, while still allowing objective standards for frontage, impervious coverage, and stormwater retention. Historic districts and historic properties are exempt, and the bill preserves state and local authority over health, safety, infrastructure, environmental, and setback regulations.
This bill would amend Idaho Code by adding a new section to Chapter 65, Title 67, creating statewide limits on municipal zoning and development standards for twin homes and duplexes. It would require affected cities to revise comprehensive plans and land use ordinances, and it would constrain local discretion over density, parking, fees, and approval processes for these housing types. The bill leaves intact other regulatory powers related to building codes, fire safety, utilities, road access, environmental protections, and historic preservation.
The available voting history suggests the bill had meaningful support but also notable opposition, passing Senate Third Reading 23-12. The lack of committee transcript material limits insight into detailed debate, but the structure of the bill indicates it is part of a housing-supply and zoning-reform effort aimed at increasing middle-density housing options. Overall, the sentiment appears generally favorable among supporters of housing development and local zoning reform, with a substantial minority opposed.
The main points of contention are likely local control versus statewide housing mandates, and whether the bill goes too far in overriding city zoning authority. Opponents may object to the requirement that cities permit twin homes and duplexes as a matter of right, the limits on minimum lot size and parking requirements, and the restriction on impact and utility fees. Supporters are likely to emphasize housing affordability, increased supply, and reduced regulatory barriers, while the bill’s exceptions for historic districts and public-safety regulations appear designed to address concerns from preservation and infrastructure stakeholders.