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Planning commission recommends council approve ADU code amendment aligning Costa Mesa zoning with recent state law
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Summary
Commissioners recommended the City Council approve an update to Title 13 of the municipal code to implement new state rules for accessory dwelling units, including clarifications on state‑mandated ADU standards, short‑term rental prohibitions, and parking rules.
The Planning Commission voted Feb. 24 to recommend City Council adopt an ordinance amending Title 13 of the Costa Mesa Municipal Code to conform local accessory dwelling unit (ADU) rules to recent state law changes.
Senior planner Chris Yeager explained the draft code amendment is a follow‑up to earlier updates and described the “third iteration” of local zoning changes intended to implement state ADU statutes. Yeager said the amendment clarifies how state‑mandated ADUs are treated, updates size and setback rules that the state allows the city to limit, and moves the city’s short‑term‑rental prohibition for ADUs into the zoning code (the city removed such deed restrictions because state law restricts their use on ADUs). “This is the third iteration,” Yeager said, summarizing updates and noting staff’s work with the California Housing and Community Development (HCD) comments.
The amendment lists standards for state‑mandated ADUs (Government Code section 66323): converted ADUs, detached ADUs on single‑family lots up to 800 square feet with 4‑foot side and rear setbacks and a maximum 18‑foot height, and similar standards for detached multifamily ADUs where state law controls allowable standards. The draft also clarifies that any removed parking spaces for an ADU need not be replaced and adds minor clarifications about separation distances between structures (deferring to the California Building Code where applicable).
Commissioners asked about owner‑occupancy rules, deed‑restriction limits for junior ADUs, how the city will track whether ADUs contribute to affordable housing goals, and how future state changes will be monitored. Planning staff said the city will survey permitted ADUs and collect data on rents and occupancy to support the Housing Element annual progress report and will continue to watch state legislation.
Commissioner Martinez, who introduced the motion recommending council adoption, and a majority of commissioners supported the recommendation; the motion carried 5‑1 with Vice Chair Zick voting no. During discussion Zick criticized the broader policy tradeoffs of encouraging ADUs, saying, “These things are not affordable units, and they make the underlying property more valuable.” Staff advised commissioners the city and HCD have iterated on the ordinance language and that the city continues to incentivize ADU production, including pre‑engineered ADU plans posted to the city website to speed permitting.
The commission’s recommendation will be forwarded to City Council for first reading and further action.
