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Gallatin County Commission adopts zoning edits to comply with state ADU law after residents urge caution
Summary
The commission voted 2-0 Feb. 10 to adopt zone text amendments for Rees Creek, Bridal Cottonwood and South Cottonwood Canyon to align with 2025 Senate Bill 532, clarifying accessory dwelling unit (ADU) definitions and appeals timing amid sharply worded public concerns about environmental impacts.
The Gallatin County Commission on Feb. 10 adopted zone text amendments intended to bring several rural zoning districts into compliance with 2025 state law that expands where accessory dwelling units (ADUs) are allowed.
Ashley Burke, county planning, told commissioners the amendments implement Senate Bill 532, now effective Oct. 1, 2025, and clarify that ADUs may be internal, attached or detached from a principal dwelling, do not count as using a development right, and must be subordinate to the primary residence. Burke also said the changes remove an examples list that had unintentionally excluded some types of ADUs and revise appeals language so the commission must decide appeals within 60 days.
The revisions…
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