Links & Resources• ADU Handout (PDF - 161kb)*
• Current Alameda County ADU Regulations (PDF - 246kb)*
• California Government Code Section 65852.2
• California Department of Housing and Community Development
The city government of Alameda will approve ADUs under California's statewide mandated regulations.
Number of ADUs allowed:
are allowed on properties zoned for single-family and multifamily residential use. are only allowed on properties currently containing one single-family dwelling.
Types of ADUs allowed:
Attached, detached and conversions of existing space are permitted.
No minimum lot size is not required for an ADU other than the requirements of the underlying zone. The total lot coverage of all building footprints and surfaces shall not exceed sixty (60%) percent.
The total floor area of the ADU cannot be more than 50% of the floor area of the primary unit.
Setbacks are determined by the standards of the underlying zone.
[State Standards] Parking requirements for accessory dwelling units shall not exceed one parking space per unit or per bedroom, whichever is less. These spaces may be provided as tandem parking on a driveway.
(II) Offstreet parking shall be permitted in setback areas in locations determined by the local agency or through tandem parking, unless specific findings are made that parking in setback areas or tandem parking is not feasible based upon specific site or regional topographical or fire and life safety conditions. When a garage, carport, or covered parking structure is demolished in conjunction with the construction of an accessory dwelling unit or converted to an accessory dwelling unit, and the local agency requires that those offstreet parking spaces be replaced, the replacement spaces may be located in any configuration on the same lot as the accessory dwelling unit, including, but not limited to, as covered spaces, uncovered spaces, or tandem spaces, or by the use of mechanical automobile parking lifts.
Notwithstanding any other law, a local agency, whether or not it has adopted an ordinance governing accessory dwelling units in accordance with subdivision(a), shall not impose parking standards for an accessory dwelling unit in any of the following instances:
(1) The accessory dwelling unit is located within one-half mile of public transit.
(2) The accessory dwelling unit is located within an architecturally and historically significant historic district.
(3) The accessory dwelling unit is part of the proposed or existing primary dwelling or an accessory structure.
(4) When on-street parking permits are required but not offered to the occupant of the accessory dwelling unit.
(5) When there is a car share vehicle located within one block of the accessory dwelling unit.
[State Standard] accessory dwelling units shall not be required to provide fire sprinklers if they are not required for the primary dwelling.
Shape, materials and style:
The ADU must incorporate the same materials, colors, and style of the primary dwelling, including roof materials and pitch, eaves, windows, accents, distinctive features, and character defining elements.
The ADU must be subordinate to the primary structure in height.
[State Standards] When a local agency that has not adopted an ordinance governing accessory dwelling units in accordance with subdivision (a) receives an application for a permit to create an accessory dwelling unit pursuant to this subdivision, the local agency shall approve or disapprove the application ministerially without discretionary review pursuant to subdivision (a) within 120 days after receiving the application. design review. design review is NOT required for an accessory dwelling unit. design review is required for unrelated work to the site or primary dwelling, if that work requires design review for some other reason (e.g., Hillside Design District, etc.) If any work to the primary dwelling requires design review, submit the completed design review application to the Planning Counter.
Remove all references to the accessory dwelling unit from the design review submittal (to the maximum extent feasible).
5. OTHER APPLICATIONS REQUIRED. Existing zoning standards may require additional applications. If a project requests relief from applicable zoning standards please consult the Planning Counter to discuss viable options.
Number of Bedrooms:
Not specified by State Standards.
The applicant for an ADU must be the current owner-occupant of the property. Prior to issuance of building permits, the property owner must record a Declaration of Restrictions on the property with the following stipulations: a. Short-term rental (less than 30 days) of the ADU is prohibited.
Local health officer approval where a private sewage disposal system is being used, if required. (State requirements)
The total lot coverage of all building footprints and nonpermeable surfaces shall not exceed sixty (60%) percent.