Does Brentwood, TN need an earthquake retrofit?

Brentwood carries Seismic Design Category D under USGS's ASCE 7-16 model. High seismic hazard - this is the category most of coastal California, the Pacific Northwest, and other active fault regions fall into. Code mandates significant seismic detailing and restricts irregular structural configurations. This is the category the Brace + Bolt scope (cripple-wall bracing, foundation bolting) is built for. Nationally, Brentwood ranks above 80% of the 4,875 cities in this dataset for seismic hazard - the 80th percentile.

Brentwood by the numbers

USGS's underlying values for Brentwood: 0.137g peak ground acceleration, 0.279g at short period, 0.139g at 1 second. Within Tennessee alone, Brentwood ranks 51 of 104 cities by seismic hazard - the 51th percentile in-state. Brentwood has a population of about 45,525.

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 Tennessee 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 Tennessee.

What this means for insurance

A Brentwood 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 Brentwood's figures come from

Brentwood's Category D 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 D does and doesn't tell you about Brentwood.