Sunnyvale Council proposes major updates to ADU zoning regulations

Sunnyvale City Council has taken a significant step towards addressing the housing crisis by introducing an updated ordinance for accessory dwelling units (ADUs) during their meeting on March 25, 2025. This ordinance aims to enhance housing opportunities within existing residential properties and streamline the development process for ADUs, which are recognized by the state as essential for increasing affordable housing options.

The proposed changes include repealing the existing ADU regulations and adopting a new ordinance that aligns with recent state laws. Key updates allow for an increase in the number of permitted ADUs on single-family lots from two to three and on multifamily properties from two to eight. This expansion is part of the city’s effort to comply with state mandates and improve the clarity and accessibility of ADU regulations for both residents and city staff.

The ordinance also introduces a streamlined review process for certain ADUs, which will not require a planning permit, thereby expediting approvals. Notably, the update maintains the owner occupancy requirement for junior ADUs while eliminating it for standard ADUs, a change mandated by state law.

In addition to these changes, the council discussed the implications of tree protection regulations. The updated ordinance will require a replacement tree for the removal of protected trees, but this requirement will only apply to non-streamlined ADUs, following guidance from the California Department of Housing and Community Development.

The Planning Commission previously reviewed the ordinance and unanimously recommended its adoption, emphasizing the importance of enhancing housing opportunities while minimizing barriers to ADU development. The council's decision to move forward with this ordinance reflects a commitment to addressing the housing needs of the community and ensuring compliance with state legislation.

As the city prepares to implement these changes, residents can expect improved access to information regarding ADU development through updates to the city’s website and resources like the ADU Accelerator program, which aims to guide homeowners through the process of creating ADUs on their properties. This initiative is a crucial step in Sunnyvale's broader strategy to tackle housing shortages and promote sustainable growth within the community.