The Montana Legislature convened on April 4, 2025, to introduce Senate Bill 532, a significant legislative proposal aimed at revising county zoning laws to facilitate the creation of accessory dwelling units (ADUs). This bill, sponsored by Senators F. Mandeville, D. Zolnikov, J. Fuller, C. Glimm, G. Hertz, and K. Bogner, seeks to address housing shortages and promote more flexible living arrangements within communities.

Senate Bill 532 mandates that counties with established zoning regulations must allow at least one accessory dwelling unit on lots containing single-family homes. These units can be attached, detached, or internal to the primary dwelling, with size restrictions set at a maximum of 75% of the main home's gross floor area or 1,000 square feet, whichever is smaller. The bill also prohibits counties from imposing certain regulations that could hinder the development of ADUs, such as requiring additional parking spaces, matching architectural styles, or occupancy by the property owner or family members.

The introduction of this bill has sparked notable discussions among lawmakers and community members. Proponents argue that allowing ADUs can help alleviate housing shortages, provide affordable living options, and enhance community density without significant new construction. Critics, however, express concerns about potential impacts on neighborhood character, infrastructure strain, and the adequacy of local services to support increased population density.

Economic implications of Senate Bill 532 could be substantial, as it may encourage property owners to create rental units, thereby increasing housing availability and potentially stabilizing rental prices in high-demand areas. Socially, the bill could foster multi-generational living arrangements and provide affordable housing options for young adults and seniors.

As the legislative process unfolds, experts suggest that the success of this bill will depend on the balance between local control and state mandates, as well as the ability of counties to adapt to these new regulations. The bill's future will likely hinge on ongoing debates regarding zoning authority and community development priorities in Montana.

In conclusion, Senate Bill 532 represents a pivotal step towards modernizing housing policies in Montana, with the potential to reshape community dynamics and address pressing housing needs. Further discussions and amendments are anticipated as the bill progresses through the legislative process.