Planning commission backs revised ADU rules to align Sunnyvale code with state law
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Summary
The commission voted unanimously to recommend that City Council introduce an ordinance amending Title 19 to update accessory dwelling unit rules, expand streamlined categories, and align definitions with recent state ADU laws.
The Sunnyvale Planning Commission on Feb. 10 voted 7-0 to recommend that City Council introduce an ordinance amending Title 19 of the Sunnyvale Municipal Code to update accessory dwelling unit (ADU) rules and align local zoning with recent California ADU statutes.
Senior planner Astha Vasist presented the proposed ordinance, which restructures the ADU chapter, updates definitions, and expands categories of ADUs eligible for streamlined ministerial review. Key changes staff described include allowing up to three ADUs on single-family lots (an expansion to permit an attached or detached ADU plus a conversion or junior ADU), increasing the number of allowed new detached ADUs on multifamily lots (from two to as many as eight in qualifying circumstances pursuant to SB 1211), and formalizing a pre-approved ADU program consistent with AB 1332.
Vasist said the proposed ordinance adopts state minima for streamlined ADUs (typically up to 800 square feet for detached or attached ADUs and up to 500 square feet for junior ADUs), clarifies objective development standards (tree removals, second-floor windows and solar analysis), and reorganizes the code so requirements are grouped by single-family and multifamily lot types. Staff also proposed a ministerial tree-replacement requirement tied to the zoning chapter for protected trees (defined in code as trees over a specified circumference) and a resource alteration permit routed to the Heritage Preservation Commission when designated heritage trees are removed.
Commissioners asked staff to confirm specific legal intersections with state rules. Commissioner Pine raised concerns about how a tree-replacement requirement would interact with Government Code section 66323 streamlined ADU standards; staff said they will seek technical assistance from the California Department of Housing and Community Development (HCD) on that question before the City Council hearing. Commissioners also discussed AB 2533 (which restricts denial of permits for unpermitted ADUs built before Jan. 1, 2020 except where a unit would be substandard under Health and Safety Code section 17920.3), parking and utility connections for ADUs, and the practicalities of heritage-tree review.
One public letter from CalHDF (a nonprofit) raised concerns about the tree-replacement requirement and the resource alteration permit for heritage trees; staff summarized those points and explained the heritage permit flows to the Heritage Preservation Commission and that Sunnyvales heritage inventory contains about 20 designated heritage trees.
A motion by Commissioner Segura to recommend Alternative 1 (introduce the ordinance as drafted and find it exempt from CEQA under Public Resources Code 21080.17 and CEQA Guidelines sections 15061(b)(3) and 15268) was seconded by Commissioner Shukla and passed 7-0. Staff said the item will go to City Council on March 25.
Why it matters: The proposed Title 19 changes aim to reduce process barriers for ADU construction, clarify standards to minimize inconsistent interpretation, and implement recent state ADU laws. Commissioners requested clarifications from HCD on objective standards that might affect streamlined approvals.
