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Costa Mesa council updates ADU rules to match state law, approves preapproved design program
Summary
The City Council introduced an ordinance updating Costa Mesa's accessory dwelling unit (ADU) rules to conform with recent state laws, added a legalization pathway for pre-2020 unpermitted units and launched a preapproved ADU design program to speed construction and reduce costs.
Costa Mesa City Council on Tuesday voted 7-0 to introduce an ordinance revising the city's accessory dwelling unit rules to reflect recent state law changes and guidance from the California Department of Housing and Community Development (HCD).
City Senior Planner Chris Yeager, who presented the item, said the revisions were required after several state statutes reorganized ADU provisions. "The changes to the number of allowed ADUs ... the new ordinance would allow for up to 8 detached ADUs on a multifamily site provided that the number of ADUs does not exceed the number of existing units," Yeager said.
The ordinance reworks allowed ADU counts and objective development standards. Among the changes: single-family properties may have a conversion ADU, a junior ADU and an additional detached or attached ADU; multifamily sites can add more…
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