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What is an ADU (Accessory Dwelling Unit) and a JADU (Junior Accessory Dwelling Unit)?

“Accessory dwelling unit” (also “ADU,” “second unit,” or “granny unit”) means an attached or detached residential dwelling unit situated on the same parcel as an existing primary single-family dwelling, which provides complete independent living facilities for one or more persons, including permanent provisions for living, sleeping, eating, cooking, and sanitation. An accessory dwelling unit also includes an “efficiency unit” as defined in California Health and Safety Code Section 17958.1 and a “manufactured home” as defined in California Health and Safety Code Section 18007. An accessory dwelling unit may be established through (i) construction of a new detached structure, (ii) construction of an addition to an existing single-family dwelling, (iii) conversion of existing space in an existing single-family dwelling, or (iv) conversion of an existing garage or other accessory structure on a lot containing an existing single-family dwelling, provided it is set back at a distance sufficient for fire safety.

“Junior accessory dwelling unit” means a unit that is no more than 500 square feet in size and contained entirely within a single-family residence. A junior accessory dwelling unit may include separate sanitation facilities, or may share sanitation facilities with the existing structure.

State Assembly Bills 68, 881, 587, and 671, and Senate Bill 13 became effective January 1, 2020, amending Government Code Section 65852.2, thus revising regulations pertaining to the development of accessory dwelling units in residential and mixed-use zoning districts.

As of January 1, 2020, regulations and development standards regarding Accessory Dwelling Units (ADUs) and Junior Accessory Dwelling Units (JADUs) are per California State Law. Below, you will find a copy of the City’s updated 2020 ADU Plan Check Submittal Requirements/Checklist/Application, as well as a reference handout to California State Law Sections 65852.2 (ADU) and 65852.22 (JADU).

Should you have any questions, please contact the Planning Services Division:
By Phone: (714) 741-5312
By Email:

CLICK HERE for Accessory Dwelling Unit Plan Check Submittal Requirements - Checklist - Application (2020 Update)

CLICK HERE for CA ADU State Law Sections 65852.2 & 65852.22