Accessory Dwelling Units (ADUs) and Junior Accessory Dwelling Units (JADUs) have been known by many names: granny flats, in-law units, backyard cottages, secondary units and more. HCD is the state’s leader on local ADU ordinances, which — while optional — have grown exponentially in number as more cities, counties, and homeowners become interested in ADUs as one solution to increasing the supply of affordable housing. 

An ADU is accessory to a primary residence and has complete independent living facilities for one or more people. There are a few variations:

  • Detached: The unit is separated from the primary structure.

  • Attached: The unit is attached to the primary structure.

  • Converted Existing Space: Space (e.g., master bedroom, attached garage, storage area, or similar use, or an accessory structure) on the lot of the primary residence that is converted into an independent living unit.

  • JADU: A specific type of conversion of existing space that is contained entirely within an existing or proposed single-family residence

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