Accessory Dwelling Units

City of Del Rey Oaks

Accessory Dwelling Units (ADU)



What are Accessory Dwelling Units?


Accessory Dwelling Units (ADUs) have been known by many names: granny flats, in-law units, backyard cottages, secondary units and more. No matter what you call them, ADUs are an innovative, affordable, effective option for adding much-needed housing in California.


What are the benefits of ADUs?


ADUs are an affordable type of home to construct in California because they do not require paying for land, major new infrastructure, structured parking, or elevators.  ADUs can provide a source of income for homeowners.  ADUs are built with cost-effective wood frame construction, which is significantly less costly than homes in new multifamily infill buildings.  ADUs allow extended families to be near one another while maintaining privacy.  ADUs can provide as much living space as many newly built apartments and condominiums, and they are suited well for couples, small families, friends, young people, and seniors.  ADUs give homeowners the flexibility to share independent living areas with family members and others, allowing seniors to age in place as they require more care.


What are JADUs?


Junior Accessory Dwelling Units (JADUs) are allowed to be created within the walls of a proposed or existing single-family residence and shall contain no more than 500 square feet. JADUs offer additional housing options. They may share central systems, contain a basic kitchen utilizing small plug-in appliances, may share a bathroom with the primary dwelling, all to reduce development costs. JADUs present no additional stress on utility services or infrastructure because they simply repurpose existing space within the residence and do not expand the dwellings planned occupancy.


ADU Workshop (Del Rey Oaks)


ADU Handbook (Updated 1/1/2021)


 The CA Legislature further updated ADU and JADU law effective January 1, 2021 to clarify and improve various provisions to promote the development of ADUs and junior accessory dwelling units (JADUs). These include allowing ADUs and JADUs to be built concurrently with a single-family dwelling, opening areas where ADUs can be created to include all zoning districts that allow single-family and multifamily uses, modifying fees from utilities such as special districts and water corporations, limited exemptions or reductions in impact fees, and reduced parking requirements.




If you are installing a new gas or electric service, or changing an existing one, you must complete a series of steps.


Water Availability


IMPORTANT! PLEASE CHECK IF YOU HAVE WATER CREDITS AVAILABLE!  If you are located on the peninsula, water availability may be a challenge. Several areas of the Peninsula have water availability issues. However, it may still be possible that you have water credits available or existing water credits to accommodate certain planned ADUs. Contact the Monterey Peninsula Water Management District for more questions at (831) 658-5601 or visit their website