Utah HB 82 (2023) requires most municipalities to allow at least one ADU on every single-family lot. However, implementation varies dramatically — some municipalities have streamlined ADU processes with reasonable fees and clear standards; others have imposed maximum-allowable restrictions (owner-occupancy requirements, aggressive size limits, restrictive design standards) within HB 82’s framework. Short-term rental zoning is even more variable and actively changing. Before designing an ADU, RainFire Builders verifies current ADU regulations at the specific property address — not general HB 82 assumptions. The regulations in this space continue to evolve, and what was accurate 12 months ago at a given address may not apply today.