Banner photo credit: California Department of Housing and Community Development Accessory Unit Handbook, December 2020: https://www.hcd.ca.gov/policy-...
To help expand housing options for Oakland residents, the City is streamlining the process for property owners to build Accessory Dwelling Units (ADUs) on their lots. As of January 1, 2020, state and local laws surrounding ADUs have changed.
Here are the new categories of ADUs under California state law:
- JUNIOR ADU (JADU): Involves conversion of space within the building envelope of an existing or proposed Single-Family dwelling, resulting in a living unit of not more than 500 sq. ft., requiring owner-occupancy in the JADU or primary dwelling unit.
- CATEGORY ONE ADU: Involves either conversion of space within an existing Single-Family Dwelling, or conversion or rebuild of an existing accessory structure; includes no expansion of the existing building envelope other than up to 150 sq. ft. for purposes of accommodating ADU access and egress only.
- CATEGORY TWO ADU: Involves construction of a new detached or attached structure, including an exterior addition to an existing structure to accommodate the ADU, in conjunction with a proposed or existing Single-Family dwelling.
TWO- OR MULTI-FAMILY ADUs*:
- CATEGORY ONE ADU: Conversion of existing non-habitable space located within portions of an existing Two-Family Dwelling or Multi-Family Dwelling, such as storage rooms, boiler rooms, passageways, attics, basements or garages
- CATEGORY TWO ADU: Construction of new detached structure(s) or conversion of existing detached structure(s) on lots with an existing Two-Family or Multi-Family Dwelling
* Change of Occupancy regulations for the California Existing Building Code (CEBC) may apply when adding ADUs.
Please see the Documents section for new ADU applications that conform to the latest legal requirements.