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Board adopts coastal‑zone ADU rules to align county with state law, with Big Sur limits
Summary
The Board of Supervisors approved Local Coastal Program amendments to allow accessory and junior accessory dwelling units in coastal zones while keeping coastal protections. Big Sur will be limited to smaller ADUs, a 90‑day minimum rental and a 1,000‑sq‑ft cap.
On Nov. 19 the Monterey County Board of Supervisors adopted amendments to its Local Coastal Program to align accessory dwelling unit (ADU) and junior ADU rules in the coastal zone with recent state law, while retaining coastal resource protections.
Planning staff told the board the amendments remove outdated acreage and unit caps in several coastal planning areas, establish a 60‑day decision timeline for complete ADU applications, and create a tiered permitting approach: an LCP coastal permit exemption for qualifying ADUs, a coastal administrative permit where the exemption does not apply, and a full coastal development permit only when specific triggers (for example shoreline or water‑resource impacts) exist.
Big Sur rules retain stronger local safeguards. ADUs in the Big Sur land‑use plan will be limited to 1,000 square feet (with smaller state‑exempt ADUs possible), subject to critical viewshed and ESHA protections, and may only be rented for long‑term occupancy — a 90‑day minimum rental period and an explicit ban on vacation‑rental use inside ADUs and JDUs.
Planning staff emphasized that coastal protections — slope, ESHA and critical viewshed controls — remain in force and that water/sewer and septic clearances from Environmental Health are required when a unit needs a new well or septic system. Staff also noted the California Coastal Commission reviewed and certified the county’s LCP amendment on Oct. 10, 2025.
Public comment included a mix of viewpoints: Big Sur community groups asked for retained caps and smaller square‑foot limits, some local organizations and homeowners supported the streamlining as a tool for housing essential workers, and speakers urged strict enforcement against short‑term rental conversions.
The board voted unanimously to adopt the LCP amendments and the implementing coastal ordinance. The county said the coastal ordinance becomes effective Dec. 19, 2025, and staff will publish guidance and FAQs to help property owners navigate the streamlined permitting process.
What this means: The decision aims to expand legal opportunities for long‑term housing in coastal communities while keeping resource protections. Property owners will be able to apply under a clarified, faster 60‑day timeline for many ADU permits; projects that affect sensitive coastal resources will still require higher‑level review.
