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County officials outline streamlined ADU process and timelines; staff to provide permit maps and counts

Alameda County Board of Supervisors Transportation and Planning Committee · May 19, 2025
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Summary

Planning and public-works staff told the committee that state law makes many accessory dwelling units (ADUs) a ministerial process with quick planning sign-off (often 1–2 days) and that building permits and environmental-health approvals (for septic) follow. Staff said ADU permit data are tracked and can be mapped on request.

Alameda County planning and public-works staff briefed the Transportation & Planning Committee on May 19 about the county’s accessory dwelling unit (ADU) application process, describing a largely ministerial review under current state law and the lists, checklists and preapproved plans the county offers to speed approvals.

Planning Director Albert Lopez said state law now allows many ADUs to be approved ministerially when they meet prescribed standards; planning sign-off typically takes one to two days, after which applicants proceed to building permit review. Public works staff provided checklists and portal instructions for applicants and noted preapproved plans can shorten review time further.

Committee members asked about statutory deadlines often cited as 30 to 60 days; staff said the timeline generally begins when an application is submitted to the local agency, and that the Department of Environmental Health is bound by the same state timelines for septic-related approvals. Staff estimated historical ADU permit counts at roughly 130 and said the county can provide maps and breakdowns (detached vs. attached ADUs) through the housing element reporting or as a targeted follow-up.

Supervisor comments included a proposal to consider a management audit of permitting functions and questions about whether building permits should be organized under Planning or Public Works; staff said building permits remain a building-division function and noted examples of projects integrating ADUs at the initial entitlement stage.

There were no public callers for this item; staff said data about permit locations and whether ADUs are detached or attached can be provided to the committee.