Check your property's zoning, browse designs & get contractor estimates for your ADU project:
Last Updated 01/26/21
City Hint: The city permitted a total of 12 ADU projects in the past year of 2019, which is below the average compared to other cities in California.
Number of ADUs allowed:
According to state law, all single-family homes are allowed at least one Accessory Dwelling Unit. Additionally, single-family lots which are owner-occupied may create one Accessory Dwelling Unit and one Junior Accessory Dwelling Unit. Also, multi-family lots may now add one ADU per every four existing residential units, so long as they were legally established.
Types of ADUs allowed:
Detached ADU, Attached ADU, Junior ADU are permitted. ADUs may be new construction or converted from existing space. JADUs must be converted from existing space.
Single family and multi-family residential properties will not be subject to the minimum lot size of the underlying zoning district or by ordinance for ADU projects. ~ AB68 & AB881 Update
Residential lots will be approved to build up to 850 square ft. for a one bedroom ADU or up to 1,000 square ft. for a two bedroom ADU, regardless of the underlying zoning standards of the property. A JADU is approved up to 500 square ft.. According to California Residential Code, the minimum size of any living unit is 150 square ft. (including Accessory Dwelling Units and JADUs). ~ AB68 & AB881 Update
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 Accessory Dwelling Units 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
Replacement parking shall not apply to parcels which convert an existing garage to an ADU or JADU. ~ AB-68
Accessory dwelling units shall not be required to provide fire sprinklers if they are not required for the primary residence and may employ alternative methods for fire protection. (State requirements)
Shape, materials and style:
Design and Features:
1. The ADU's color and materials shall match the primary residence.
2. The ADU shall not have any second-story outdoor balcony, deck, or patio closer than ten feet from any property line.
3. If an automatic sprinkler system is required for the primary residence, the ADU must also provide an automatic sprinkler system.
4. The main entrance to the dwelling unit shall be accessed from the side yard setback, side street setback, or rear yard setback.
5. For any second-story ADU, including any ADU proposed above a garage, all exterior windows that face rear or side yard areas of an adjacent property, are not separated by an alley, and are closer than ten feet from the property line shall be fitted with translucent glazing and be either fixed (i.e., inoperable) or of an awning style with a maximum opening angle of 25 degrees.
(1.) Attached ADUs: An ADU that is attached to the primary residence shall comply with the height requirements applicable to the primary residence. (2.) Detached ADUs: An ADU that is detached from the primary residence shall not exceed a height of 14 feet and one story, except as follows: a detached ADU may be up to 22 feet on a second floor if either (i) it is not located within the rear setback area or (ii) it is constructed above and within the existing footprint of an existing garage and/or existing building.
State Standards don't require any additional design review.
Number of Bedrooms:
Not specified by State Standards.
Between between 2020 and 2025, owner occupancy requirements will not apply to new ADUs. (applicable to new construction and conversion units) ~ SB13 Update
Fees and utility connections.
A. The property owner shall pay all sewer, water, school district, and other applicable fees, including development impact fees.
B. The property owner shall pay all applicable connection fees and capacity charges, including sewer connection fees pursuant to Section 22.210.030, except as provided in subsections C. and D. below.
C. An ADU specifically exempted under Government Code Section 65852.2(e) and (f), which is created by the conversion of an existing space pursuant to Section 24.430.040.H., shall not pay any related connection fee or capacity charge.
D. An ADU shall be equipped with a water sub-meter, pursuant to Section 22.130.015, but shall not require a separate water or sewer utility connection from the Primary Dwelling Unit.
E. If an ADU will use a private sewage disposal system, the property owner shall obtain approval by the Los Angeles Regional Water Quality Control Board and the City Building and Safety Division.
ADUs are not permitted on any real property listed in the California Register of Historic Places, or designated as a historic landmark or located in a historic district overlay zone under Chapter 24.455, except following design review pursuant to Section 24.455.620 and Chapter 24.340.
ADUs are not permitted in the Coastal Zone, except within the Downtown Specific Plan and a portion of the Midtown Corridors Area.
*** Beginning in 2020, according to state law, all residential zoning districts, including single-family and multi-family, are allowed to build Accessory Dwelling Units. ***
Zoning Districts: R-1 (Single-Family Zone), R-2 (Two-Family Zone), or R-3 (Multiple-Family Zone), as shown on the Zoning District Map.
Lot Coverage: The combined total of both the primary residence and ADU shall not exceed the maximum lot coverage applicable to the lot, plus five percent. The combined rear yard lot coverage shall not exceed the maximum applicable to the lot, plus ten percent.
Conversion of Existing Space: Conversion of existing space within a single-family residence or within a legally permitted accessory structure to an accessory dwelling unit shall be permitted by right, provided that the proposed accessory dwelling unit has independent exterior access from the existing residence, and the side and rear setbacks are sufficient for fire safety and as required per the adopted California Building Standards and local ordinance.
Building and safety requirements.
An ADU will be subject to Building and Safety requirements of the City, including, but not limited to, the following:
A. Structural Assessment: An ADU conversion of existing structures built prior to 1970 will require structural assessment in accordance with ASCE 41-13.
B. Utility Equipment: Each ADU must have its own water heater and space heating.
C. Building and Safety Permits: Each ADU must obtain all required Building and Safety permits in compliance with current California Building Standards Codes (California Code of Regulations, Title 24) and local ordinances.
Residential Building Code:
The California Building Code (CBC) 2019 is adopted.
ADU Design Library
Browse hundreds of models to find the right fit for your property.
ADU Model 625 sqft
W 25 ft L 12 ft
ADU Model 160 sqft
W 20 ft L 8 ft
ADU Model 1120 sqft
W 35 ft L 32 ft
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SELECT ADU SIZE & TYPE
* upon completion of ADU
CONSTRUCTION COST ESTIMATE
* based on local average price per sqft
SELECT ADU SIZE & TYPE
Size: 500 sqft
Appreciation Estimate = (Base Value: $) / (Home's Living Space: sqft) * (ADU's Living Space: sqft)
Rental Estimate = (Rent Per Sqft: $3.10) * (ADU's Living Space: sqft)
Housable is providing information about specific properties that is furnished to users as a good-faith estimate of the development potential of a property. You should not in any way base your development, investments, or other financial decisions on this information. We strongly advise you to consult with an industry professional, such as a lender, realtor, contractor, or architect, who is sufficiently licensed and insured in their field, and who can work with you individually to confirm all requirements before moving forward with any real estate development or investment.