Los Angeles requires foundation bolting and cripple wall bracing for older wood-frame homes under Division 88 of the LA Building Code. Houses built before 1978 without bolted sill plates are most vulnerable. Standard Plan 1 (pre-approved by LADBS) covers bolt-only retrofits for single-family dwellings. The Earthquake Brace + Bolt (EBB) program offers up to $3,000 in incentives for qualifying homeowners.
Under Division 88 of the LA Building Code and the California Existing Building Code Chapter A3, older wood-frame homes that are not bolted to their foundations are required to be anchored during certain renovation triggers. When alterations, additions, or repairs exceed 50% of the building's replacement cost, full seismic upgrade including foundation anchoring is required. LADBS Standard Plan 1 provides a pre-approved detail for bolt-only foundation retrofits on single-family dwellings, streamlining the permit process. Cripple wall bracing with structural plywood is also addressed under these provisions. The state-run Earthquake Brace + Bolt (EBB) program, administered by the California Residential Mitigation Program (CRMP), offers incentives up to $3,000 for qualifying homeowners in high-risk ZIP codes to bolt and brace their homes. Los Angeles has numerous qualifying ZIP codes due to proximity to multiple fault lines including the San Andreas, Hollywood, and Santa Monica faults.
Failure to retrofit when triggered by renovation: stop-work order on the renovation project until compliance. No standalone enforcement for existing homes without a renovation trigger, but disclosure is required at point of sale.
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