Accessory Dwelling Units – Internal

Consistent with Utah State and Herriman City codes, residents may apply for a permit to build and manage an "internal accessory dwelling unit" (I-ADU) in their single-family home. However, specified requirements must be met to obtain an I-ADU permit. Click this link for the City's ordinance regarding accessory dwelling units.

To see if you qualify to have an I-ADU, check the General Requirements. If you want to verify your zoning or have any other questions regarding the general requirements, please call 801-446-5323 and ask for the Planning Department or email planning@herriman.gov.

Requirements for submitting a permit application for an I-ADU

  1. Verify your lot qualifies for an I-ADU. Check that your property is in a Residential or Agricultural Zone and that your lot is .1377 acres or larger by searching your address on the Herriman Zoning Map. Also be aware that only one (1) accessory dwelling unit is allowed per lot, either an internal or detached ADU.
  2. Application Form
  3. Site Plan (see sample I-ADU Site Plan) showing all parking, the exterior access to the I-ADU, and the pathway to it for emergency personnel access. If a walkout will be newly constructed with this permit, add setback measurements, measurements of the walkout, and the accurate number of stairs.
  4. Picture of Address (see sample I-ADU Address) showing the front of the home and the location of the additional address with a "B" unit letter that will be visible from the street for emergency responders.
  5. Floor Plan – show the layout of the I-ADU, including bedrooms. If construction is being done with this permit for the I-ADU, provide all construction plans needed. See Basement Finishes and/or Basement Walkouts for details and samples.
  6. I-ADU Affidavit (see I-ADU Affidavit form) signed and notarized by the owner(s). The affidavit will be recorded with the County Recorder, indicating that the primary dwelling contains an I-ADU. Notaries are available at City Hall at no charge.

Permit Fees

  • I-ADU Application Review Fee: $559.00
  • Building Permit Fee: Varies (based on square footage of the area to be built or remodeled, including walkouts). See the calculation form.

Plan review takes approximately 7–14 business days and, when approved, the final invoice will be emailed. After payment is made, the permit will be issued and inspections may be scheduled as needed.

*IMPORTANT: Please be aware that any work done without a permit prior to applying for this I-ADU will be subject to removal of some or all finishes, including but not limited to drywall, insulation, etc., to perform required building inspections. See Basement Finishes and/or Basement Walkouts for information and a list of required inspections.

Final Inspection

After the I-ADU permit is issued and all construction or renovations have been completed, a final inspection must be scheduled and approved to receive final approval for use as a rental unit. Please call 801-446-5327 before 4:00 p.m. to schedule for the next business day or after. The inspector will be checking for the following items:

  1. Additional address with “B” is installed on the front of the home.
  2. House is in good condition (roof, smoke/co detectors, electrical, handrails, guardrails, etc.).
  3. Hard-surface walkway from I-ADU exit to the public way for emergency responders. Hard surface is defined by the Unified Fire Authority as concrete, pavement, or professionally laid pavers.
  4. Verify bedroom windows meet egress with ladders if needed.
  5. Fire extinguisher is visible from the entrance of the I-ADU.

After all inspections are approved, a Certificate of Occupancy will be sent from the Building Department and a I-ADU approval letter will be sent from the Zoning Department. Once both of these are issued and the Business License is obtained, the I-ADU may be rented.

Contact Us

Hours

7:30 a.m. - 5:30 p.m. | Monday - Friday

Please call before 4:00 for inspection requests

Phone

801-446-5327

Email

building@herriman.gov

Cathryn Nelson • Building Official
Phone: 801-446-5327 | Email

Cathryn Nelson

Lon Christensen • Assistant Building Official/Inspector
Phone: 801-446-5327 | Email

Lon Christensen

Wade Lehmberg • Assistant Building Official/Inspector
Phone: 801-446-5327 | Email

Wade Lehmberg
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