Oakland Accessory Dwelling Unit (ADU) Regulations
Oakland classifies ADUs based on the primary residence type. One-family lots allow JADUs (internal only, owner-occupied), Category One (conversions), and Category Two (new construction). Multifamily lots allow Category One (interior non-habitable conversion), Category Two (detached), and Category Three (attached, limit one). JADUs require a recorded deed restriction for owner occupancy.
An Accessory Dwelling Unit (ADU) in Oakland is defined as an interior, attached, or detached dwelling unit that is accessory to a primary Residential Facility on the same lot. These units must provide complete independent living facilities, including permanent provisions for living, sleeping, eating, cooking, and sanitation [Section 17.09.040].
Junior Accessory Dwelling Units (JADUs)
A Junior Accessory Dwelling Unit (JADU) is a specific type of ADU contained entirely within the building envelope of an existing or proposed One-Family Residential Facility [Section 17.09.040, A].
- Conversion: JADUs may be created by converting enclosed uses within the residence, such as an attached garage. However, they cannot be created by converting detached or attached accessory structures.
- Facilities: A JADU must include an efficiency kitchen. It may have separate sanitation facilities or share them with the primary residence.
- Occupancy Requirements: The owner must occupy either the JADU or the primary Residential Facility. A deed restriction must be recorded to enforce this requirement.
One-Family Residential ADU Categories
For lots containing an existing or proposed One-Family Residential Facility, ADUs are classified into two main categories:
Category One ADU (Conversion)
This category involves the conversion of space within an existing One-Family Residential Facility or a legally existing associated accessory structure. It also applies to associated accessory structures that are rebuilt according to specific city standards [Section 17.09.040, B].
Category Two ADU (New Construction)
This category covers newly constructed attached or detached ADUs. It may include an exterior addition to the existing primary One-Family Residential Facility to accommodate the new unit [Section 17.09.040, C].
Multifamily Residential ADU Categories
Lots containing Two- to Four-Family or Multifamily Dwelling Facilities are subject to three ADU categories:
Category One ADU (Interior Conversion)
This involves converting legally existing non-habitable space—such as storage rooms, boiler rooms, passageways, attics, or basements—located within the existing portions of the multifamily facility. Non-habitable space does not include existing residential units, commercial space, or communal finished spaces like gyms or laundry rooms [Section 17.09.040, D].
Category Two ADU (Detached)
This involves newly constructed detached ADUs or the conversion of legally existing detached accessory structures. Converted units must stay within the existing building envelope or be rebuilt in the same location with the same exterior dimensions [Section 17.09.040, E].
Category Three ADU (New Attached/Interior)
This involves a newly constructed ADU that is interior or attached to the primary structure, or a conversion of a legally existing attached accessory structure. This category is limited to the creation of only one ADU on the lot [Section 17.09.040, F].
General Definitions and Standards
- Building Envelope: The exterior surface of a building (foundation, walls, roof, etc.). Converting an open balcony, deck, or unenclosed understory into a living area is considered an increase in the building envelope [Section 17.09.040].
- Efficiency Dwelling Unit: A unit containing only one habitable room (excluding the kitchen) with a total floor area of 400 square feet or less [Section 17.09.040].
- Regular Dwelling Unit: Any dwelling unit that is not an Efficiency Dwelling Unit, Rooming Unit, or ADU [Section 17.09.040].