Haddon Heights's Seismic Design Category, explained

Under the seismic model IBC and ASCE 7 use for new construction, Haddon Heights is Category B. Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Nationally, Haddon Heights ranks above 55% of the 4,875 cities in this dataset for seismic hazard - the 55th percentile.

Where Haddon Heights sits in New Jersey

The raw figures: peak ground acceleration 0.097g, short-period spectral response 0.175g, 1-second spectral response 0.047g. Among 194 New Jersey cities in this dataset, Haddon Heights ranks 165 for seismic hazard, the 15th percentile within the state. About 7,588 people live in Haddon Heights, New Jersey.

Bracing and bolting: the actual cost

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for New Jersey. 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 Haddon Heights address.

More on how this number was built

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