4 county-level rules, plus city-specific rules for 1 city in Orange County, California.
Verified from official government sources
Orange County has not adopted a mandatory soft-story retrofit ordinance comparable to Los Angeles (Ordinance 183893) or Santa Monica (Ord. 2479CCS). Multi-family wood-frame buildings with tuck-under parking in unincorporated Orange County are governed only by the seismic provisions in the California Existing Building Code (CEBC) Chapter A4 'Earthquake Hazard Reduction for Existing Wood-Frame Residential Buildings' as adopted by the County of Orange Building Code (Codified Ordinances Title 7, Div. 1).
Unincorporated Orange County does not mandate foundation bolting for existing homes. California's Earthquake Brace + Bolt (EBB) program offers grants up to $3,000 for qualifying homeowners to bolt their homes to foundations and brace cripple walls.
Unincorporated Orange County does not have a mandatory unreinforced masonry (URM) retrofit ordinance. California SB 547 required inventories of URM buildings but did not mandate retrofits. Few URM buildings exist in unincorporated OC areas due to newer construction patterns.
California does not mandate seismic gas shutoff valves for existing single-family homes. Some Orange County cities require them upon property sale. SoCalGas recommends but does not require automatic shutoff valves. Installation requires a plumbing permit.
1 cities in Orange County have their own earthquake safety rules. Each link goes to that city's dedicated page with code citations.
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Orange County Ordinance Hub →