Check your property's zoning, browse designs & get contractor estimates for your ADU project:
Number of ADUs allowed:
Under state law, each single-family home may now add at least one ADU. Owner occupied single-family parcels may add one ADU and one JADU. Multi-family parcels, per every four existing residential units, may add one ADU, so long as the existing units were legally established.
Types of ADUs allowed:
Detached ADU, Attached ADU, Junior ADU are allowed. ADUs may be new construction or converted from existing space. JADUs must be converted from existing space.
Single family and multi-family residential parcels will not be subject to the minimum lot size of the underlying zoning district or by ordinance for Accessory Dwelling Unit projects. ~ AB68
Residential properties will be approved to create up to 850 sq. ft. for a one bed ADU or up to 1,000 sq. ft. for a two bed ADU, regardless of the underlying zoning standards of the property. A Junior Accessort Dwelling Unit (JADU) is approved up to 500 sq. ft.. According to California Residential Code, the minimum size of any living unit is 150 sq. ft. (including Accessory Dwelling Units and Junior Accessort Dwelling Unit (JADU)s). ~ According To AB68
Newly constructed detached Accessory Dwelling Units can be as close as 4 feet from the rear and side property lines. Setbacks will not be required for Accessory Dwelling Units and JADUs converted from existing space that was legally eastablished. Attached Accessory Dwelling Units and conversions from existing space to be expanded will be required to comply with the setbacks of the underlying zone. ~ Updated: State Law AB-68
Replacement parking shall not apply to lots which convert an existing garage to an ADU or Junior Accessory Dwelling Unit. ~ Updated: State Law 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:
State Standards don't specify design restrictions.
State Standards don't specify height restrictions.
State Standards don't require any additional design review.
Number of Bedrooms:
Not specified by State Standards.
Owner-occupancy will not be required for new ADUs (conversion and new construction) built between 2020 and 2025. ~ Updated: State Law SB-13
Local health officer approval where a private sewage disposal system is being used, if required. (State requirements)
*** Beginning in 2020, according to state law, all residential zoning districts, including single-family and multi-family, are allowed to build Accessory Dwelling Units. ***
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 485 sqft
W 25 ft L 25 ft
ADU Model 975 sqft
W 39 ft L 25 ft
ADU Model 400 sqft
W 20 ft L 20 ft
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: $3.25) * (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.