Guides

• How QuakeRetrofitCheck Reports Your City's Seismic Data — The exact USGS source and query behind every city's Seismic Design Category, peak ground acceleration, and national rank, named and sourced.
• What a Seismic Design Category Actually Means (and Doesn't) — Why a city's Seismic Design Category is a building-code baseline, not an assessment of one house - and what actually determines if a home needs retrofitting.
• Earthquake Retrofit Cost & California's Brace + Bolt Grant — Sourced 2026 retrofit cost figures, and the complete eligibility rules for California's Earthquake Brace + Bolt grant, beyond what a single city page can check.