Building an ADU in Glendale, California

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Glendale is located in Los Angeles County in California. Glendale has a total population of 191719 over a land mass of 30.45 Square Miles. When it comes to ADUs, the city allows for 1+ ADUs on a given property, and a square footage of 850-1,000 sf

Number of ADUs Allowed


Size of ADU Allowed

850-1,000 sf

Types of ADUs Allowed

Detached, Junior, Attached

Permit Cost

Coming Soon

Number of ADUs allowed

Under state law, each single-family home may now create at least one ADU. Owner occupied single-family lots may create one ADU and one Junior ADU. Multi-family lots, per every four existing residential units, may create one ADU, so long as the existing units were legally established.

Property Requirements

Single-family and multi-family Parcels will be allowed to create up to 850 sqft for a one bed ADU or up to 1,000 sqft for a two bed ADU, regardless of the underlying zoning standards of the property. A Junior Accessory Dwelling Unit up to 500 sqft is allowed. The minimum size of any living unit (including Accessory Dwelling Units and Junior Accessory Dwelling Units) is 150 sqft according to Califronia Residential Code. ~ AB68

Types of ADUs Allowed

Attached ADU

An attached ADU is one that is attached to your house. Also know as Addition ADUs or “bump-out ADUs. These types of ADUs can be accessed from the primary house with a door in the connection point, but also can be independent of the main home.

Detached ADU

A detached ADU is not connected to your primary house. The dwelling needs to be within your property setbacks and allowable building size (both height and square footage).

Junior ADU

Junior Accessory Dwelling Units (JADUs) are named this way because they are small (up to 500 square feet).

In California, the recent state bills AB68 and AB 881 permits both an ADU and a Junior ADU (JADU) on the same lot with a proposed or existing single-family dwelling. This means you can have two units on your lot: ADU, and JADU.

Property Requirements

Between between 2020 and 2025, owner occupancy requirements will not apply to new ADUs. (applicable to new construction and conversion units) ~ Updated: State Law SB-13
Number of ADUs Allowed
Under state law, each single-family home may now create at least one ADU. Owner occupied single-family lots may create one ADU and one Junior ADU. Multi-family lots, per every four existing residential units, may create one ADU, so long as the existing units were legally established.
ADU Size
Single family and multi-family residential lots will not be subject to the minimum lot size of the underlying zoning district or by ordinance for ADU projects. ~ According To AB68
Replacement parking shall not apply to properties which convert an existing garage to an Accessory Dwelling Unit (ADU) or JADU. ~ According To AB68
A detached accessory dwelling unit shall not exceed 15 feet or the height of the primary dwelling whichever is lower, except that a conversion of a detached accessory garage may add a second story which shall not exceed 25 feet (plus 3 feet for any roofed area having a minimum pitch of 3 feet in 12 feet).
Fire Safety
Comply with building codes, including sufficient setbacks for fire safety as determine by the Fire Department. Fire sprinklers shall be required for the accessory dwelling unit if fire sprinklers are required for the residential dwelling. Notwithstanding the above provisions, accessory dwelling units shall have setbacks sufficient for fire safety as determined by the Fire Department.
Utility Connections
The ADU must be served by utilities, including sewer, water and electric. The property owner shall pay all sewer, water, school district, and other applicable fees, including development impact fees. The property owner shall install a new or separate utility connections between the ADU and the utility, and pay all applicable connection fees or capacity charges, except if the ADU is located within the existing space of the residential dwelling and has independent access or is located within an existing, permitted accessory structure.
Except as identified in the city ordinance, accessory dwelling units shall comply with all of the same development standards (e.g., floor area, height, lot coverage, landscaping, setbacks, minimum lot size, etc.) that apply to the residential dwelling.
Set backs
The maximum required setback for a detached new construction Accessory Dwelling Unit (ADU) shall be no more than 4 ft. from the rear and side property lines. Setbacks will not be required for Accessory Dwelling Unit (ADU)s and Junior Accessort Dwelling Unit (JADU)s converted from existing space that was legally eastablished. Attached Accessory Dwelling Unit (ADU)s and conversions from existing space to be expanded will be required to comply with the setbacks of the underlying zone. ~ AB68 & AB881 Update

Design Review

AN INTERIM URGENCY ORDINANCE OF THE CITY COUNCIL OF THE CITY OF GLENDALE, CALIFORNIA, TO ESTABLISH STANDARDS AND Ministerial PROCESS FOR APPROVING accessory dwelling units (ADUs). BE IT ORDAINED BY THE COUNCIL OF THE CITY OF GLENDALE. Design review. Architectural drawing showing existing and proposed buildings and modifications, location of entrances, required parking, driveways, windows, setbacks, landscaping.

Next Steps

To get started on your ADU, here are some first steps.

Call Your City

Search Google for your city’s contact number. eg “City of {Phoenix} Residential Permits Contact Number”

You can call the main line and get directed to the permitting department.

Ask these questions...

1) Can I put a secondary home on my lot (Accessory Dwelling Unit)?
2) What are my livable setbacks, and ADU size regulations?
3) Can I put a prefabricated guest house on my property?

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