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How ADUs and SB 9 relate to SB 684 and Sunnyvale code

City of Sunnyvale Community Development ยท July 23, 2026
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Summary

City staff walked attendees through ADU rules (chapter 19.79), how SB 9 functions in single-family zones, and how those existing tools relate to the newly enacted SB 684 and SB 1123.

City associate planner Gabby Ventura explained that accessory dwelling units (ADUs) are smaller, independent homes on the same property as a primary residence, typically with their own kitchen and bathroom, and that ADUs may be attached, detached, or created by converting existing space. "An ADU is a smaller independent home located on the same property as a primary residence," Ventura said during the presentation, and she noted ADUs are incorporated in Sunnyvale's municipal code (chapter 19.79).

Ventura also summarized SB 9 and how the city has implemented it as DUO/ULS in the municipal code: SB 9 applies to single-family zoning districts, allows homeowners to either construct additional homes on a lot or split a lot into two parcels (urban lot split), and is reviewed ministerially under objective standards. Staff explained the policy question before Sunnyvale is whether ADUs or SB 9 should be permitted on parcels newly created under SB 684 or SB 1123, a choice that would increase or limit potential unit counts depending on the option selected.