Does Brookshire, TX need an earthquake retrofit?

Under the seismic model IBC and ASCE 7 use for new construction, Brookshire is Category A. Lowest seismic design category. Building code requires no seismic-specific detailing here beyond ordinary construction practice. Nationally, Brookshire ranks above 11% of the 4,875 cities in this dataset for seismic hazard - the 11th percentile.

Where Brookshire sits in Texas

USGS's underlying values for Brookshire: 0.031g peak ground acceleration, 0.065g at short period, 0.037g at 1 second. Within Texas alone, Brookshire ranks 265 of 384 cities by seismic hazard - the 31th percentile in-state. Brookshire has a population of about 5,782.

Bracing and bolting: the actual cost

A full earthquake retrofit typically runs $5,000-$10,000 nationally (around $7,000 typical), driven mainly by house size and foundation type, not by Texas specifically. California's Earthquake Brace + Bolt grant, which covers a large share of this cost, is a California-only program and does not apply in Texas.

Earthquake insurance for a Brookshire home

A Brookshire homeowner cannot buy a standalone earthquake policy in most cases - it is added to an existing homeowners policy as an endorsement, so the place to start is a regular home-insurance quote.

Where Brookshire's figures come from

Brookshire's Category A and every number above trace to USGS's own ASCE 7-16 Design Maps service - see the methodology guide. See the category explainer for what Category A does and doesn't tell you about Brookshire.