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 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.
Types of ADUs allowed:
Detached ADU, Attached ADU, Junior ADU are permitted. Accessory Dwelling Unit (ADU)s may be new construction or converted from existing space. Junior Accessort Dwelling Unit (JADU)s 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. ~ AB68
Residential lots will be permitted to build up to 850 square ft. for a one bed ADU or up to 1,000 square ft. for a two bed ADU, regardless of the underlying zoning standards of the property. A Junior ADU is permitted 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 Junior ADUs). ~ According To AB68
The maximum required setback for a detached new construction Accessory Dwelling Unit (ADU) shall be no more than 4 feet 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. ~ According To AB68
Replacement parking shall not apply to properties which convert an existing garage to an Accessory Dwelling Unit (ADU) or Junior Accessort Dwelling Unit (JADU). ~ According To AB68
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.
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
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 600 sqft
W 30 ft L 20 ft
ADU Model 400 sqft
W 20 ft L 20 ft
ADU Model 644 sqft
W 28 ft L 23 ft
"Housable has been a great resource regarding my ADU project. I purchased both the Property and Design Reports. In both cases, they delivered as promised and on time."Ed in Corona, CA
"The property report was great! Made me feel like my project is feasible."Alexandria in Santa Ana, CA
"My experience with Housable was exceptional. The team was extremely helpful and responsive. I am very satisfied and happy to have used these services. As a home owner I do not know the construction lingo or process but the Housable team very kind and helpful and patient with me. My expectations were exceeded. Thank you for everything."Monica H. in Oakland, CA
"My permits were APPROVED, thank you for all your hard work. I am in the process of meeting with contractors. "Mary S. in San Jose, CA
"I just wanted to let you know that the permit process has been completed and we are currently in the construction phase. The work you guys did was great and I will definitely be using this service again in the future. I will keep you guys updated on anything important. Thanks!"Patrick L. in Orange County, CA
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: $2.49) * (ADU's Living Space: sqft)