Basement Apartment Requirements for the City of Herriman

Herriman, Utah Accessory Dwelling Unit Requirements

Hello, Caleb with Dansie Design Build here. Today, we’re talking about accessory dwelling units in Herriman City, such as their requirements for creating a legal apartment or secondary dwelling unit in a single-family home. So if you’re looking to make a basement apartment, this video will help you know if you can do that in Herriman City.

How Many ADUs Can You Have Per Single-Family Home?

You can only have one accessory dwelling unit per single-family home, so one per property; if you’re looking to renovate your detached garage and basement into an ADU, that would be unacceptable to the city. So we have had some people looking to do that in the past, which does not work.

Can I Have a Detached Accessory Dwelling Unit?

They only allow internal accessory dwelling units, so you cannot have one in a detached garage; you would have to put the I-ADU in the basement or somehow partition off the main level.

The Dwelling Must Be Owner-Occupied. What Does That Mean?

One requirement the city has is that it must be owner-occupied, meaning that the owner has to live in one of the two units. They do have some leeway there where you can live somewhere else for four months of the year. They require that someone on the title of the property is the owner, so that’s what they’re considering “owner-occupied,” someone who is on the title, living there for at least eight months of any calendar year.

No Short-Term Rentals

They do not allow vacation rentals, so things like Airbnb and other short-term rentals are not allowed. Instead, they’re looking for long-term tenants or residents to occupy the second dwelling unit.

Your Units Must Look Like a Single-Family Home

Another regulation is that it has to meet the appearance of a single-family home. For example, they ask that we maintain a single door on the front of the property, so the entry to the second dwelling has to be on the side or the back.

The Primary and Secondary Units Must Share a Wall, Floor, or Ceiling

The next requirement is that the second dwelling unit border or shares walls adjacent to the primary dwelling unit, either sharing a wall, floor, or ceiling. So a basement shares a ceiling or floor with the primary dwelling unit. You can also partition off the internal accessory dwelling unit, for example, the west side of the house is the second dwelling, and the east side is the primary dwelling for the homeowner; or whatever floor plan works well for the situation. Remember that the second entry must be on the side or the back.

The Exception to the Rule for Sharing Adjacent Walls

The only exception is that they allow accessory dwelling units to be above existing garage space, so that’s not technically considered living space of the primary dwelling unit, but it is allowable.

Parking Stall Requirements

The next thing that I want to share with you is the parking. You must have four parking stalls for the primary unit and one more for the internal ADU. So if you have a two-car garage, you have two parking stalls inside and two more in the driveway, which makes four; you only need one more parking space off-street. So you would need to pour a little concrete on the home’s side.

Lot Size Requirements for I-ADUs

The last requirement is your lot has to be 6,000 square feet or greater. I have a video showing how you can easily calculate your lot size online HERE.


If you’re considering a basement apartment in your home or want an accessory dwelling unit on your property in Herriman City, Utah, request a consultation or call us at (801) 341-9690. We’d love to talk to you and see how we can help you and your family. Thank you for your time, and have an excellent rest of your week.


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