An Accessory Dwelling Unit (ADU) is a second dwelling unit in an owner-occupied single-family property that is clearly incidental and accessory to the main dwelling on the property. ADUs can be either internal, detached or attached.
Internal ADU: An ADU created (a) within a primary dwelling unit; (b) within the footprint of the primary dwelling unit at the time the internal ADU is created; and (c) for the purpose of offering a long-term rental of 30 consecutive days or longer. Internal ADUs must meet the standards in Utah Code § 10-9a-530.
Detached ADU: An ADU located in an accessory building on the property and not attached to or within the principal dwelling unit.
Attached ADU: A new ADU is constructed as a physical expansion (i.e., addition) of the primary dwelling and is attached to the single-family dwelling unit by one or more common walls.