Laguna Hills's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Laguna Hills is Category D. High seismic hazard - this is the category most of coastal California, the Pacific Northwest, and other active fault regions fall into. Code mandates significant seismic detailing and restricts irregular structural configurations. This is the category the Brace + Bolt scope (cripple-wall bracing, foundation bolting) is built for. Nationally, Laguna Hills ranks above 90% of the 4,875 cities in this dataset for seismic hazard - the 90th percentile.

Where Laguna Hills sits in California

The raw figures: peak ground acceleration 0.507g, short-period spectral response 1.204g, 1-second spectral response 0.434g. Among 429 California cities in this dataset, Laguna Hills ranks 303 for seismic hazard, the 29th percentile within the state. About 30,378 people live in Laguna Hills, California.

Bracing and bolting: the actual cost

Because Laguna Hills is in California, the EBB grant applies if the ZIP code participates and the house qualifies (wood-framed house on a raised (not slab-on-grade) foundation, built before 1980): a $3,000-$7,000 bracing-and-bolting job drops to $0-$4,000 after the $3,000 base grant, or effectively free for income-eligible households getting the full $10,000.

Insuring against this, not just retrofitting

Earthquake coverage in California mostly runs through the California Earthquake Authority (CEA), sold only through licensed agents at CEA-participating insurers - there is no direct-to-consumer CEA policy. A general home-insurance quote is the practical starting point for a Laguna Hills homeowner asking about it.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Laguna Hills's numbers. The retrofit cost and grant guide covers every EBB eligibility rule, including the ones this page can't check.