Accessory Dwelling Units


The City of Santee Planning and Building Department is available to help residents interested in Accessory Dwelling Units (ADUs). ADU’s include granny flats, in-law suites, second units and casitas. ADUs are experiencing a boost in popularity among homeowners. This is in part due to legislative changes that have made it easier and less expensive for homeowners to build such units on their property. 

ADUs provide independent living area, a place to live and sleep, with a kitchen, and their own bathroom on the same property with a primary residence. ADUs are intended as permanent housing solutions, and are not to be occupied as short-term rentals.

The County of San Diego has developed plans that have been designed and reviewed for compliance with the California Building Code and are provided at no cost to residents. These may be used as guidance as homeowners develop their floor plans and elevations. It will be up to the individual property owner to complete plans based upon their specific site and most recent code updates. Click here to view San Diego County Plans.



City of Santee Resources

You may hire a qualified draftsman or architect to complete the plans which must be signed by a person responsible for plan preparation.  You may also be required to hire an engineer to prepare a grading plan. ADU’s in Santee must comply with the 2022 California Green Building Standards Tier II Voluntary Measures and Santee Municipal Code Sections 13.10.040 J and K regarding energy conservation. 



Phone: 619-258-4100 ext. 167
Hours: M–Th 8:00am–1:00pm | 2:00pm-5:00pm*, F 8:00am-1:00pm
*Building Division is closed 1:00pm-2:00pm M-Th

Santee City Hall, Planning & Building Department
10601 Magnolia Avenue, Building 4
Santee, CA 92071

City of Santee Seal
City of Santee
10601 Magnolia Ave.
Santee, CA 92071

City Hall Operational Hours:
M-Th 8:00am – 5:00pm, F 8:00am – 1:00pm

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