Accessory Dwelling Units


Accessory Dwelling Units (ADU)

An ADU is a self-contained dwelling incorporated within an existing occupied structure that is designed as a single-family dwelling and does not substantially alter the structure or appearance of the existing structure. They are often called mother-in-law, basement, or accessory apartments, cottage homes, accessory suites, or ancillary units.

Image depicting different types of accessory dwelling units

Changes to ADU Regulations

In June 2019, the City Council passed an ordinance that allows for ADUs more broadly throughout the city. Prior to making changes to the ADU regulations in Spanish Fork, much time had been spent reviewing the City’s current regulations for Accessory Apartments and evaluating whether changes were warranted.  The process undertaken by City staff involved the study of other communities’ regulatory programs, a community survey, focus groups, and multiple public meetings with the Planning Commission and City Council.


The following table outlines some of the changes to ADU requirements that were approved by the City Council in June 2019.  The full list of requirements is listed in Title 15 of the municipal code (

  Old RequirementsCurrent Requirements
Owner Occupancy Required
Units per Dwelling Only one (1) ADU per single-family dwelling
Off-Street Parking Two (2) off-street parking spaces per dwelling
Permitted Zones R-3 & R-1-6 R-3, R-1-6, R-1-8,
R-1-9, R-1-12 & R-1-15
Minimum Lot Size 10,000 square feet 8,000 square feet
Building Code Must meet all applicable building codes Different requirements for different situations
Impact Fees Required Not required
Separate Electric Meters Required Not required
Registration Register with Utility Office Register with Community Development Department


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


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

Dave Anderson 
Community and Economic Department Director 

Brandon Snyder
City Planner

Kimberly Brenneman
Department Secretary
Business Licensing Specialist

Jessica Burdick
Building Inspection Secretary – Residential Permits
Phone: 801-804-4547

John Little
Chief Building Official 
Phone: 801-804-4542