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 create at least one Accessory Dwelling Unit. Owner occupied single-family parcels may create one Accessory Dwelling Unit and one Junior ADU. Multi-family parcels, per every four existing residential units, may create one Accessory Dwelling Unit, so long as the existing units were legally established.
Types of ADUs allowed:
Detached ADU, Attached ADU, Junior ADU are approved. ADUs may be new construction or converted from existing space. JADUs must be converted from existing space.
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 Accessory Dwelling Unit (ADU) projects. ~ AB-68
Residential parcels will be approved to construct up to 850 square feet for a one bed ADU or up to 1,000 square feet for a two bed ADU, regardless of the underlying zoning standards of the property. A JADU is approved up to 500 square feet. According to California Residential Code, the minimum size of any living unit is 150 square feet (including ADUs 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 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. ~ Updated: State Law AB-68
Replacement parking shall not apply to properties which convert an existing garage to an Accessory Dwelling Unit (ADU) or JADU. ~ AB-68
Accessory dwelling units shall not be required to provide fire sprinklers if they are not required for the primary dwelling and may employ alternative methods for fire protection.
Shape, materials and style:
Accessory dwelling units shall comply with all appropriate building code requirements.
The ADU shall comply with the maximum height of the underlying zone.
A permit for an accessory dwelling unit shall be approved by the Director of Development Services or his designee for any accessory dwelling unit that meets the requirements of this chapter. An application for an accessory dwelling unit shall be acted upon within 120 days after receipt of a complete application.
Number of Bedrooms:
Accessory dwelling units shall not be sold separate from the primary residence. Accessory dwelling units shall not be sold separate from the primary residence.
Owner-occupancy will not be required for new Accessory Dwelling Units (conversion and new construction) built between 2020 and 2025. ~ SB13 Update
Accessory dwelling units shall comply with all appropriate building code requirements. No new or separate utility connection between the accessory dwelling unit and the utility shall be required. No accessory dwelling unit shall be allowed if the Building Official determines that there is not adequate water or sewer service to the property.
*** 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 600 sqft
30 ft x 20 ft
ADU Model 400 sqft
20 ft x 20 ft
ADU Model 850 sqft
25 ft x 17 ft
This estimate is based on recently completed projects in the area and is inclusive of all typical soft costs such as permitting, design and engineering fees.