Check your property's zoning, browse designs & get contractor estimates for your ADU project:
City Hint: The city permitted a total of 4 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 ADU. Additionally, single-family properties which are owner-occupied may create one ADU and one Junior ADU. Also, multi-family properties 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 approved. ADUs may be new construction or converted from existing space. JADUs must be converted from existing space.
Residential lots will not be subject to any minimum lot size for Accessory Dwelling Unit (ADU)s by ordinance or of the underlying zoning district. ~ According To AB68
An ADU attached or constructed within an existing building shall be at least 150 sq. feet, but not more than 50% of the net floor area, or 850 square feet, whichever is greater.
A detached ADU studio or one -bedroom unit shall be at least 150 sq. ft. and shall not exceed a maximum of 850 square feet. A detached ADU with more than one bedroom shall contain at least 150 square feet and shall not exceed a maximum of 1,000 square feet.
1. An attached ADU shall conform to the setbacks required of the primary unit within the zone. No additional setbacks are required for the conversion of an existing structure into an ADU.
2. A detached accessory dwelling unit shall be set back a minimum of 20 ft. from the front property line, 4 ft. from the side property line, and 4 ft. from the rear property line
An ADU must have one covered or uncovered parking space in addition to the parking required for the primary unit. The parking space may be located within a required setback on a compliant parking surface or as a tandem space on an existing driveway.
A unit shall not be required to provide parking if:
a. The accessory dwelling unit is located within one-half mile of public transit. (For the purpose of this paragraph, public transit means any established bus stop associated with the bus services available for general public, such as but not limited to County Connection).
b. The accessory dwelling unit is located within an architecturally and historically significant historic district.
c. The accessory dwelling unit is part of the existing primary residence or an existing accessory structure.
d. When on-street parking permits are required, but not offered to the occupant of the accessory dwelling unit.
e. When there is a car share vehicle located within one block of the accessory dwelling unit. (For the purpose of this paragraph, car share vehicle means a passenger vehicle available at a designated location for general public by reservation and with a fee, such as but not limited to vehicles managed by Zipcar.)
Per state minimum requirements.
Shape, materials and style:
1. The exterior shall be built in harmony with the immediate neighborhood.
2. Outside access shall not be in the front of the existing building.
3. The ADU shall be designed to minimize potential privacy issues with the neighboring properties, and additional landscape screening may be required.
1. The height of an attached accessory dwelling is based on maximum height allowed in the applicable residential zone.
2. The height of a detached accessory dwelling shall be limited to 16 feet
Ministerial review per state standards.
Number of Bedrooms:
Not specified by State Standards.
Rental of the primary or accessory dwelling unit shall not be for a term of 30 days or less unless approved for “lodging uses” pursuant to the zoning ordinance.
Local health officer approval where a private sewage disposal system is being used, if required. (State requirements)
1. Attached dwelling unit. A dwelling unit that has one or more party
walls in common with another dwelling unit.
2. Detached dwelling unit. A dwelling unit that does not share any walls
in common with another dwelling unit.
3. Secondary unit. An attached or detached rental dwelling unit located
on a lot which contains a single-family dwelling. A secondary unit
shall include provisions for living, eating, sleeping, cooking and
sanitation. A secondary unit is not considered an accessory building as
defined in Division D2 and Division D8 (Glossary).
*** Beginning in 2020, according to state law, all residential zoning districts, including single-family and multi-family, are allowed to build Accessory Dwelling Units. ***
Secondary units are permitted in the RC, HR, RE, RS, RM, RMH, and in PD zones for residential uses on lots with a single-family dwelling.
Non-conforming units. Where the existing dwelling unit constitutes a legal
non-conforming unit, a secondary unit may be constructed only if the nonconformity
is not expanded and the secondary unit meets all current applicable
Residential Building Code:
The California Building Code (CBC) 2019 is adopted.
2401 Crow Canyon Road, San Ramon, CA 94583 San Ramon, CA 94583
ADU Design Library
Browse hundreds of models to find the right fit for your property.
ADU Model 468 sqft
W 26 ft L 18 ft
ADU Model 196 sqft
W 14 ft L 14 ft
ADU Model 600 sqft
W 30 ft L 20 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: $4.49) * (ADU's Living Space: sqft)