Does Sugar Grove, IL need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Sugar Grove is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Sugar Grove ranks above 47% of the 4,875 cities in this dataset for seismic hazard - the 47th percentile.

How Sugar Grove compares

The raw figures: peak ground acceleration 0.073g, short-period spectral response 0.14g, 1-second spectral response 0.067g. Among 330 Illinois cities in this dataset, Sugar Grove ranks 77 for seismic hazard, the 77th percentile within the state. About 9,339 people live in Sugar Grove, Illinois.

What a retrofit costs in Sugar Grove

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

What this means for insurance

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 Sugar Grove address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Sugar Grove'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.