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Planning commission debates ADU code update, urges staff follow-up on utilities, fees and design flexibility

City of St. Helena Planning Commission · April 21, 2026
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Summary

Commissioners broadly supported staff's proposed ADU ordinance updates to comply with state law and to increase permitted ADU size to 1,200 sq ft, but asked staff to return with clarifications on interior livable-space definitions, how setbacks and lot-coverage interact, the calculation and timing of impact and hookup fees, and possible flexibility on objective design standards.

City staff presented a substantial rewrite of the accessory dwelling unit (ADU) portions of the zoning code and the Planning Commission opened a broad discussion of policy tradeoffs, technical clarifications and implementation mechanics.

Senior Planner Jackie O'Neal explained the draft (file ZOA26001) responds to recent state law changes that require ministerial approvals in many cases, 15-day completeness determinations and a 60-day decision window for qualifying ADU applications. Staff recommended removing separate utility-connection requirements for most ADUs when existing infrastructure can support the additional unit, increasing the ADU maximum to the state-allowed 1,200…

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