Charleston ranks 10th-riskiest US county to insure. Here’s how much it costs

For Midlands professionals and retirees who own beach houses in Charleston or investment properties along the South Atlantic coast, a new industry analysis quantifies what your renewal notices have already suggested: coverage in the Lowcountry is becoming one of the hardest bets in the U.S. insurance market.

Charleston County ranks as the 10th-riskiest county in America for insurers, with a Home Insurance Risk Index score of 98.9 out of 100, according to a new report from digital insurance agency Insurify. The county’s average annual home insurance premium sits at $5,491 — 86% above the national average.

That single data point matters for anyone underwriting a second-home purchase, modeling short-term rental yields on Isle of Palms or Folly Beach, or holding a legacy property near the peninsula. Insurance is no longer a rounding error in the pro forma.

Insurify built its Home Insurance Risk Index at the county level, covering 3,136 counties across the 50 states and Washington, D.C. Each county received a score from 0 to 100 — least risky to most risky — with 50 representing the national median.

Charleston’s 98.9 places it in the top tier of insurer exposure nationwide. The ranking reflects the county’s location and its sensitivity to storms, the report noted, citing severe flooding from Hurricane Idalia in 2023 as an example of the loss events driving carrier caution.

The counties Insurify identified as riskiest cluster along the Gulf and South Atlantic coasts. Because hurricanes are among the most destructive natural disasters carriers underwrite, insurers charge more across the Southeast — and Charleston sits squarely in that pricing zone.

One nuance worth understanding for anyone comparing markets: risk ranking and premium ranking are not the same thing.

Charleston ranks 10th nationally on the risk index but 74th nationally on premium cost. That gap suggests carriers’ pricing has not yet fully caught up to the underwriting risk they’re absorbing — a dynamic that historically precedes either sharp rate increases, tightened underwriting or outright market withdrawals.

For property owners, the implication is straightforward: the $5,491 average premium is a floor, not a ceiling. Renewal shocks and non-renewal notices are more likely in markets where actuarial risk outpaces current pricing.

The Charleston numbers sit inside a broader national repricing of coastal risk. Homeowners insurance premiums in the U.S. have risen 38% since 2021, outpacing both inflation and wage growth, according to a report from the Coalition for an Insurable Future cited in the analysis. The coalition’s report correlates the rising rates to increasing climate disasters.

South Carolina is already one of the most expensive states in the country for home insurance, and rates are expected to climb further in the coming years as climate risks intensify. Coastal counties cost more to insure because they face greater exposure to natural disasters — a pattern that shapes the entire Lowcountry market, not just Charleston.

For Columbia-based owners of Charleston, Beaufort or Horry County properties, several implications follow from the data:

Cash-flow modeling on rentals. A $5,491 average premium — with upward pressure from a 98.9 risk score not yet reflected in pricing — changes the math on vacation rentals and long-term coastal holds. Rental yields calculated on pre-2021 insurance assumptions are increasingly outdated.

Resale exposure. As premiums rise and carrier availability tightens, buyer pools narrow. Properties that require force-placed coverage or state-backed wind pools carry a discount at resale that owners often underestimate until they list.

Renewal risk. The gap between Charleston’s risk ranking (10th) and premium ranking (74th) is the kind of spread that historically prompts carriers to non-renew books of business rather than absorb losses. Owners with policies from carriers actively pulling back in high-risk Southeastern markets face the prospect of scrambling for replacement coverage on short notice.

Financing implications. Lenders require continuous coverage. A non-renewal without a replacement policy in hand can trigger force-placed insurance at rates that dwarf even the elevated market averages — and can complicate refinancing or sale.

Charleston is not alone. The riskiest counties Insurify identified are concentrated along the Gulf and South Atlantic coasts, meaning owners with properties spanning Beaufort, Hilton Head or the Grand Strand face structurally similar pressures, even if those counties did not crack the national top 10. Hurricane exposure drives the pricing across the entire Southeastern coastal band.

For property owners weighing whether to hold, sell or restructure a coastal position, the 98.9 index score is the number to watch. It measures the risk insurers see — and, over time, insurers’ view of risk tends to become the market’s view of value.

This report was produced with the assistance of a proprietary tool powered by artificial intelligence and using our own originally reported, written and published content. It was reviewed and edited by our journalists.

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