Accessory Dwelling Units

Accessory Dwelling Units (ADU)

An ADU is a self-contained dwelling that may be located within a single-family dwelling or in a permanent accessory structure. Single-family dwellings with an ADU shall not substantially alter the structure or appearance of the existing structure. Accessory Structures that house an ADU shall be architecturally compatible with the primary structure. ADUs are often called mother-in-law, basement, accessory apartments, cottage homes, accessory suites, or ancillary units.

Image depicting different types of accessory dwelling units


The following table outlines some of the ADU requirements.  The full list of requirements is listed in Title 15 of the municipal code (

  Current Requirements
Owner Occupancy Required
Units per Dwelling Only one (1) ADU per single-family dwelling
Off-Street Parking Minimum of four(4) off-street parking spaces for external ADUs. Minimum of three (3) off-street parking spaces for internal ADUs.
Permitted Zones All residential zones except for A-E, R-4, R-5 and R-O
Minimum Lot Size 6,000 square feet
Building Code Different requirements for different situations
Impact Fees Not required
Separate Electric Meters Not required
Secondary Address ADUs are assigned a secondary address for public safety purposes. The address is not recognized by the USPS for mail delivery.
Registration Register with Community Development Department


ADUs in Spanish Fork must be registered annually. Click here to submit an application. The annual registration fee is $60.


For more information regarding ADUs in Spanish Fork City, please contact us:

Brandon Snyder
City Planner

Kimberly Brenneman
Development Coordination Manager
Business Licensing Specialist

Jill Helt
Permit Technician

John Little
Chief Building Official