Savannah Hurricane Building Code: FEMA Says Risk Beats Miami

Savannah’s Hurricane Exposure Is Higher Than Miami’s. The Building Code Doesn’t Reflect It.

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When we published our three-part series Hurricane Resilience by City, we analyzed FEMA’s National Risk Index across five major Gulf and Southeast coastal metros. This piece started when we ran a sixth city through the same data: Savannah.

What Principal Architect Patrick Chopson, AIA, found when he compared the FEMA data to what Georgia’s building code actually requires turned out to be a bigger story than the numbers alone.

FEMA’s own loss data ranks Chatham County’s (Savannah) hurricane exposure higher, per dollar of building, than Miami-Dade. Yet Georgia’s building code lets much of the county go up without the impact-rated envelope Miami requires on every building. As the state transitioned to a new code in 2026, it tightened flood and tornado rules but did not touch the coastal-wind standard that the data says Savannah needs most.

There is a number in the federal government’s risk database that almost no one in Georgia has reckoned with publicly.

According to FEMA’s National Risk Index, the agency’s actuarial estimate of expected annual loss from 18 natural hazards (updated in December 2025), Chatham County loses an expected $276.7 million a year across $63.2 billion in building value. That works out to $4,376 in expected annual loss per million dollars of building value.

Run the same calculation on the markets that dominate the national conversation about hurricane risk, and Savannah doesn’t trail them. It beats most of them.

Its rate per dollar of building value is nearly double Miami’s. On hurricane wind and storm surge specifically, Chatham County’s loss rate of $2,989 per $1 million edges out Charleston’s $2,914 and roughly doubles Miami-Dade’s.

Savannah, in other words, is a more hurricane-exposed market than Miami by the federal government’s own math. And here is the part that should make this a story: the building code that governs what goes up in Chatham County does not reflect that. Not even close. Georgia overhauled that code this year, and the overhaul did not fix it.

What the federal data actually shows

Expected Annual Loss is not a forecast for any single season. It is the structural cost of being where you are, built the way you’re built, averaged over time. Think of it as what an insurer would need to collect each year to break even on claims.

Three findings in the tract-level data make Savannah’s case unusually clean:

It’s a concentrated hurricane market. Sixty-eight percent of Chatham County’s expected annual loss comes from hurricane wind and storm surge, a profile closer to New Orleans (73%) than to neighboring Charleston (56%).

Savannah is a hurricane town in the way most people assume Miami is, except the per-dollar numbers run higher.

The risk is uniform. Unlike Tampa, where coastal tracts can carry three to five times the exposure of inland ones, Chatham County’s hurricane risk is spread evenly. The 90th-percentile tract sits at $3,169 per $1 million; the 10th percentile at $2,915. There is no safe submarket to retreat to. Every site carries roughly the same exposure.

It isn’t a poverty number. Every census tract in Chatham County rates “Very High” on FEMA’s Community Resilience score, meaning the county has the infrastructure, healthcare, and economic capacity to recover. The $4,376 figure isn’t inflated by social vulnerability. It’s a clean read on the hazard itself.

The hazard is concentrated and it’s everywhere in the county. The question is what the law requires anyone to build against it.

The code gap, and why it runs the wrong direction

Florida and Georgia do not regulate hurricane construction the same way. They don’t even use the same kind of rulebook.

Florida writes its own code, the Florida Building Code, rebuilt on a three-year cycle with each edition absorbing the last storm season’s lessons. In Miami-Dade and Broward, the High-Velocity Hurricane Zone overlay mandates impact-rated envelopes and Miami-Dade product approvals, with design wind speeds running 170 to 185 mph by risk category.

Georgia adopts the model International Building Code with state amendments, with wind loads pulled from the ASCE 7 standard. As of January 1, 2026, the state transitioned from the 2018 edition to the IBC 2024 (referencing ASCE 7-22), a change the Georgia Department of Community Affairs Board gave final approval in August 2025.

Here is the mechanism that matters. The code only mandates impact-rated glazing inside what it calls the “wind-borne debris region,” defined as within one mile of the coast where the design wind speed reaches 130 mph or greater, or anywhere it hits 140 mph. Coastal Georgia’s mapped design wind speed runs roughly 130 to 140 mph right at the shoreline and drops into the 120-to-130 mph band a few miles inland.

Savannah sits up the river, well inside the barrier islands. Its mapped wind speed lands at or below that 130 mph trigger across much of the developable mainland. Whether a building is even required to have an impact-rated envelope depends on the exact parcel, and across much of Chatham County, it isn’t required at all.

Compare that to Miami, where every parcel triggers the strictest envelope standard in the country. Savannah carries the higher hazard and the lower mandate. That is the worst combination on the board: more exposure, weaker rule.

It compounds in the fine print. Georgia’s enhanced disaster-resilient construction provisions live in optional code appendices that each local jurisdiction must affirmatively adopt. They are not automatically in force. So “built to code” on the Georgia coast can mean built to a standard the federal government’s own loss data says is inadequate for the site.

The timing is the story

Georgia is not ignoring resilience. It actively strengthened its code. Just not where the FEMA data points.

The IBC 2024 transition expanded flood-resistant design from the 100-year flood to the 500-year flood event, added new tornado provisions, and updated seismic models. Those are real improvements. But the hurricane wind-load posture and the wind-borne-debris trigger geography flow from the referenced ASCE 7 maps, and they carried over essentially unchanged. The state closed its flood gap and its tornado gap in 2026 while the coastal-wind gap stayed open.

That’s the scoop hiding in plain sight: a code overhaul took effect this year, and it left untouched the single hazard that drives 68% of the coast’s expected loss.

The external scorekeepers have been flagging Georgia’s posture for years. The Insurance Institute for Business & Home Safety, which grades all 18 hurricane-coast states on code adoption and enforcement every three years in its Rating the States report, placed Georgia in the “poor” tier in 2021 and in the middle third (down two points) in its 2024 edition. The institute’s recurring finding is that communities stay vulnerable when jurisdictions fail to adopt or enforce modern codes, or let them lapse.

Why the obvious fix is hard

If the state floor is low, why doesn’t Savannah simply raise its own?

Georgia is a preemption state. Local governments have limited authority to exceed state building code minimums, and attempts to do so have been blocked.

In 2018, the state legislature passed House Bill 876, barring local governments from restricting wood-frame construction on taller buildings when state minimums are met. Opponents argued the bill would prevent coastal cities like Savannah from strengthening their codes. The bill passed anyway and remains in effect.

The state code floor sits below the documented risk, and the city’s room to lift it locally is legally constrained.

The stakes are not hypothetical

In September 2024, Hurricane Helene made landfall in Florida as a Category 4 and tore across Georgia with hurricane-force winds, killing 37 people and causing more than $2.5 billion in property damage in the state, according to the Georgia Insurance Commissioner’s office. The next storm that tracks up the Savannah River will meet a building stock much of which was permitted under a wind standard built for a milder coast.

The exposure lands differently by building type. For multifamily, the county’s uniform risk means there is no inland submarket to build down to, and every project needs the same baseline. For senior living, extended-outage backup power and protected elevators and refrigeration are life-safety systems, not amenities. For hospitality, the math is brutal and simple: the hotel that reopens in two weeks while competitors take two months captures the displaced demand.

Expected Annual Loss tells you how much hazard sits on a site. The building code tells you the minimum you’re required to build against it. A 2018 analysis using MIT’s Break-Even Mitigation Percentage methodology found that a $330,000 mitigation investment on a $10 million Savannah building would pay for itself over the structure’s life. The gap between what the code requires and what the hazard demands is not expensive to close. It’s just not required.

In Savannah, those two numbers point in opposite directions, and the building is where the gap gets resolved, for better or worse.

This analysis grew out of cove’s three-part series Hurricane Resilience by City, which examines what FEMA’s National Risk Index reveals about hurricane resilience across five major coastal metros.

About cove’s Principal Architect Patrick Chopson, AIA

Patrick Chopson, AIA, is Co-Founder and Principal of cove, an AI-powered architecture firm transforming how buildings are designed and delivered. A licensed architect with 20+ years of experience, technologist and building scientist, Patrick focuses on the intersection of AI and Architecture.

He previously co-founded the building performance consultancy Pattern r+d and co-authored Build Like It’s the End of the World (Wiley, 2025), a guide to decarbonizing AEC. His work has been featured in Architect Magazine, TechCrunch, and ArchDaily, and he regularly collaborates with developers and industry leaders on next-generation solutions.