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Development Code Amendment- where ADU's are prohibited

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Consultation has concluded

Lehi City is updated the Code requirements for where internal ADU's (accessory dwelling units, i.e. mother-in-law apartments) are allowed in the City. This change proposes to show where internal ADU's are not allowed by a map. The decision on where to restrict ADUs is based on limited utility capacity in those areas. If you have any questions or comments, please talk to us below.


Lehi City is updated the Code requirements for where internal ADU's (accessory dwelling units, i.e. mother-in-law apartments) are allowed in the City. This change proposes to show where internal ADU's are not allowed by a map. The decision on where to restrict ADUs is based on limited utility capacity in those areas. If you have any questions or comments, please talk to us below.


Consultation has concluded

Ask questions to Staff about the project. You may submit a question on here or call Staff directly using the contact information above.

  • Share Could you please clarify what constitutes a mother-in-law apartment? My wife and I recently built our home knowing her mom will eventually come live with us. Thus we built a large bedroom with an accompanying sitting room, walk-in closet, and full bathroom in the walk-out basement. Thanks. on Facebook Share Could you please clarify what constitutes a mother-in-law apartment? My wife and I recently built our home knowing her mom will eventually come live with us. Thus we built a large bedroom with an accompanying sitting room, walk-in closet, and full bathroom in the walk-out basement. Thanks. on Twitter Share Could you please clarify what constitutes a mother-in-law apartment? My wife and I recently built our home knowing her mom will eventually come live with us. Thus we built a large bedroom with an accompanying sitting room, walk-in closet, and full bathroom in the walk-out basement. Thanks. on Linkedin Email Could you please clarify what constitutes a mother-in-law apartment? My wife and I recently built our home knowing her mom will eventually come live with us. Thus we built a large bedroom with an accompanying sitting room, walk-in closet, and full bathroom in the walk-out basement. Thanks. link

    Could you please clarify what constitutes a mother-in-law apartment? My wife and I recently built our home knowing her mom will eventually come live with us. Thus we built a large bedroom with an accompanying sitting room, walk-in closet, and full bathroom in the walk-out basement. Thanks.

    rycmat asked over 2 years ago

    Great question, we say "mother in law apartment" because more people seem to have heard of that then an Accessory Dwelling Unit. Based on the Development Code, you do not need a separate permit if you have family living with you (i.e. your mother in law). We only require a permit if you are creating a separate dwelling area to rent to people who are not family.  An accessory dwelling unit requires some sort of kitchen area as well as bathroom and bedroom. 

    We also have some separate requirements if it is a detached building like an apartment over a garage. Those require a permit whether they are rented to family or unrelated people.