Naples's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Naples is Category A. Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. Rank it against the rest of the country and Naples sits at the 1th percentile for seismic hazard among 4,875 US cities.

How Naples compares

The raw figures: peak ground acceleration 0.02g, short-period spectral response 0.043g, 1-second spectral response 0.022g. Among 228 Florida cities in this dataset, Naples ranks 194 for seismic hazard, the 15th percentile within the state. About 20,168 people live in Naples, Florida.

What a retrofit costs in Naples

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for Florida. A typical retrofit still runs $5,000-$10,000 nationally, about $7,000 for a common single-family job.

Insuring against this, not just retrofitting

Outside California, earthquake coverage is typically sold as an endorsement added to a standard homeowners policy, not a separate product - worth asking about directly when getting a home-insurance quote for a Naples address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Naples's numbers. The guide to what a Seismic Design Category actually means covers why a category is never a substitute for an engineer's assessment of one specific house.