Accessory Dwelling Units (ADU)

On May 8, 2018,  the Rosemead City Council adopted Ordinance No. 979. The purpose of this Ordinance is to adopt new regulations for accessory dwelling units (ADU).


An accessory dwelling unit (ADU) is an attached or detached structure that providespicture of adu independent living facilities for one or more persons and includes permanent provisions for living, sleeping, eating, cooking, and sanitation on the same parcel as a single-family dwelling unit. They can have a separate mailing address and be rented to a third-party or occupied by a property owner(s). The legal property owner shall occupy, on a full-time basis, either the primary dwelling unit or accessory dwelling unit as permanent residency. A copy of the recorded Owner-Occupancy Covenant shall be submitted to the Planning Division prior to issuance of any building permit for the accessory dwelling unit. The said Owner-Occupancy Covenant shall remain in perpetuity and shall not be released.


  • An accessory dwelling unit shall be deemed an accessory use.
  • A maximum of one accessory dwelling unit may be permitted per lot.
  • The primary use of such lot must be single-family dwelling.
  • An accessory dwelling unit shall not be located on any lot containing more than one single-family dwelling unit.
  • The creation of an accessory dwelling unit shall not alter the single-family dwelling appearance of the lot.
  • The accessory dwelling unit shall be located at the rear of the primary residence, located within the rear fifty (50) percent of the lot, and match the primary residence in architectural design, color, and materials.
  • An accessory dwelling unit shall have independent exterior access, and shall not have interior access from the primary residence.
  • Prior to the approval of an accessory dwelling unit, the single-family dwelling must comply with the applicable minimum off-street parking and floor-area requirements.
  • The creation of an accessory dwelling unit shall not result in or contribute to a floor-area ratio greater than what is permitted in the zone in which it is located.
  • The accessory dwelling unit shall not be for sale separate from the primary residence.
  • Separate utility meter for accessory dwelling unit shall be prohibited.

Please refer to Rosemead Municipal Code Section 17.30.190 for more detailed information.


An administrative site plan and design review must be submitted for review to the Planning Division prior to submitting for a Building Permit (as part of Building Plan Check process) to ensure compliance with the zoning regulations.

For more information, please contact the Planning Division at (626)569-2140.