Provo, UT Accessory Structures: ADU Rules (2026)

30 ("Accessory Dwelling Units") governs ADUs in conjunction with one-family detached dwellings. As required by Utah Code Section 10-9a-530, the use of an accessory dwelling unit in areas zoned primarily for residential use (RA, R1, R2, LDR, MDR, HDR, CMU, VLDR, RM, RC, certain PRO zones, and SDP overlay zones 2-5) is a permitted use except as otherwise provided in the chapter, and internal ADUs are a permitted use in all areas west of Interstate 15. 030, no more than one ADU is allowed per one-family detached dwelling, and an ADU may be located only over an attached garage, inside the dwelling, in an addition that preserves one-family character, or in a detached accessory structure in the rear and/or side yard.

A detached ADU structure must be at least 200 square feet but have a footprint and height less than the main dwelling, be set back from any property line no less than 10 feet (or the existing dwelling setback if less), be architecturally compatible, sit on a site-built foundation, and have independent utility connections; shipping containers are prohibited unless they meet building codes and are clad to match. 020. The ADU may not house more than three related or unrelated adults plus minor children. 26, which expires one year after approval or upon transfer of the property and is tied to a recorded deed restriction.