Orange County zoning controls oversized homes on small lots through floor area ratio limits, height caps, and second-story setback rules in residential zones, particularly within unincorporated foothill and coastal communities.
OCCO Title 7 sets base floor area ratios in residential zones, often capping total habitable area at thirty-five to fifty percent of lot size depending on zone and lot. Second-story plate heights, articulation requirements, and side-yard setbacks scale with parcel width to discourage out-of-character bulk. Areas like Coto de Caza, North Tustin, and Modjeska Canyon impose additional design overlay rules. Variances require findings of hardship and neighbor notice. Cities including Newport Beach, San Clemente, and Laguna Beach maintain their own stricter mansionization rules. Demolition over fifty percent triggers full code compliance.
Construction beyond approved FAR is denied final inspection; unauthorized expansion can trigger forced demolition and fines of one to five thousand dollars.
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See how Huntington Beach's anti-mansionization rules stack up against other locations.
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