Admitted Homeowners Premium Is Leaving Coastal Markets — How Fast Did Residual Books Grow?

Homeowners insurance on the U.S. coasts is no longer a story about a single hurricane season. It is a story about where the premium went when admitted carriers stopped wanting the risk. Between 2018 and the mid-2020s, Florida’s Citizens Property Insurance Corporation, California’s FAIR Plan, and Louisiana Citizens absorbed a growing share of policies and premium that used to sit in the voluntary admitted market. The interactive dashboard above answers a desk question with numbers: how much admitted HO-3 premium migrated into residual and FAIR books in Florida, California, and Louisiana — and how fast?

The short version is uneven but unmistakable. Florida residual premium share rose from about 7% in 2018 to about 20% in 2023 [Citizens FL MSR] — a +13 percentage-point climb in five years, or roughly +2.6 pp per year to the peak. California’s FAIR Plan share of new-and-renewed residential policies moved from 1.6% to 3.7% over a similar window [CDI Jan 2025], while FAIR dwelling policies in force roughly doubled-plus from September 2020 to September 2024 [Milliman 2025]. Louisiana Citizens swelled from roughly 35,000 policies before Hurricane Laura to more than 128,000 by late 2022, about 6% of the state’s property market [PAR Nov 2022]. Surplus-lines homeowners premium grew faster than admitted premium nationally in 2022–23 [Bloomberg S&P GMI], but the residual books are the political and fiscal shock absorbers when admitted appetite collapses.

What “admitted exit” means on a balance sheet

“Insurers leaving the coast” is a headline. The measurable object is channel mix. An admitted carrier writes regulated HO-3 (or equivalent) coverage in the voluntary market. When that carrier non-renews, restricts ZIP codes, or exits a state, households either find another admitted writer, buy surplus-lines coverage outside the admitted market, or land in a residual mechanism — Citizens in Florida and Louisiana, the FAIR Plan in California.

Residual mechanisms are not identical. Florida Citizens is a large multiperil residual writer with published statewide market-share reports. California’s FAIR Plan is primarily a basic fire residual that often needs a Difference-in-Conditions wrap to resemble a full homeowners policy. Louisiana Citizens combines FAIR and Coastal plans with a statutory pricing floor designed to stay above private quotes. Those design differences matter for coverage quality; they matter less for the first-order desk question of premium and policy share leaving the admitted book.

Florida: the fastest residual premium absorption

Citizens Florida market-share reports put the 2018 residual book near 424,000 policies and about $827 million in direct premium written — roughly 7% of statewide homeowners premium. By year-end 2023 the residual book held about 1.22 million policies and roughly $4.17 billion in premium — about 20% of statewide homeowners DPW [Citizens FL MSR]. That is a five-fold premium multiple in five years, not a rounding error.

The climb was not linear. Residual premium share hovered near 7% through 2019, then stepped to 9% in 2020, 12% in 2021, 19% in 2022, and 20% in 2023. The steepest annual jumps coincide with the post-Ian litigation and reinsurance shock window, when admitted appetite visibly contracted and Citizens became, for a stretch, the state’s largest homeowners writer by policies in force.

The 2024–25 reverse is real in direction even where year-end shares are still settling: legislative reforms, takeouts, and new specialty admitted capital pulled policies back out of Citizens after the 2023 peak near 1.4 million policies. Desk estimates put residual premium share back toward the high single digits by 2025 — proof that residual share is a stock that can shrink, not a one-way ratchet. The speed of the climb still matters: Florida showed how quickly an admitted HO book can hand premium to a residual writer when capital and appetite flee.

California: slower share, faster FAIR dollars

California’s retreat looks different on a share chart. CDI’s residential fact sheet (January 2025) shows FAIR Plan new-and-renewed policies rising from about 140,000 in 2018 (1.6% of the residential market) to about 325,000 in 2023 (3.7%) [CDI Jan 2025]. That is a +2.1 pp policy-share move — material, but an order of magnitude slower than Florida’s premium-share surge.

Premium dollars tell a sharper story. Milliman’s synthesis of FAIR Plan disclosures puts written premium near $424 million in FY2021 and about $1.27 billion in FY2024 — roughly a 3× increase — while dwelling policies in force rose from about 203,000 in September 2020 to about 452,000 in September 2024 (+123%) [Milliman 2025]. Voluntary-market new-and-renewed counts drifted down over 2018–2023 even as FAIR and surplus-lines counts rose. The admitted market did not vanish; it selectively retreated, especially in high-fire counties where FAIR concentration far exceeds the statewide average.

For desks, the California lesson is that premium can migrate faster than statewide share. A residual book that is still single-digit as a share of policies can already rank among the largest writers by premium if average rates and exposure climb.

Louisiana: a hurricane-timed residual surge

Louisiana’s residual story is timed to named storms. Public snapshots put Louisiana Citizens near 35,000 policies before Hurricane Laura, then above 128,000 by late 2022 — roughly a 3.7× policy multiple — with the commissioner framing Citizens at about 6% of the property insurance market [PAR Nov 2022]. FAIR-plan homeowners and wind-only premium dominated the residual book’s collections in the 2022 rate-filing window.

Desk-estimated residual premium share moves from under 2% in 2018 toward roughly 7% by 2023, then eases slightly as private capacity partially returns. The pace to peak — about +1.1 pp per year — sits between California’s gradual climb and Florida’s sprint. The institutional twist is the pricing floor: Louisiana Citizens is required to price above private-market quotes, so residual growth is a pure availability signal, not a race to undercut admitted rates.

Channel mix: admitted, residual, and surplus

Residual markets are only one escape hatch. Nationally, non-admitted homeowners premium grew about 27.5% from 2022 to 2023 versus roughly 13.8% for admitted premium, per S&P Global Market Intelligence figures carried in secondary reporting [Bloomberg S&P GMI]. In coastal states the three-way mix — admitted / residual / surplus — is the useful dashboard, not a binary “insured or not.”

Florida’s 2023 mix is the starkest: residual near 20% of premium with surplus also elevated versus 2018. California’s 2023 policy mix still shows admitted dominance near the mid-90s, but FAIR and surplus both expanded from thin 2018 bases. Louisiana’s estimated mix shows residual and surplus jointly reclaiming a high-single-digit to low-double-digit slice after the hurricane cluster. Surplus lines do not trigger the same fiscal assessment politics as residual plans; residual plans do. That is why residual share is the political headline even when surplus growth is the quieter private-market response.

Pace comparison: who moved how fast?

Normalize each state to residual premium-share change per year to the peak:

• Florida: +13 pp over five years → ~+2.6 pp/yr
• Louisiana: ~+5.4 pp over five years → ~+1.1 pp/yr (estimated premium share)
• California: ~+3.2 pp over six years → ~+0.5 pp/yr (estimated premium share; policy share +2.1 pp)

Florida is not merely “worse weather.” It is the clearest case of admitted premium share compression at residual-market speed. California’s slower statewide share climb coexists with rapid FAIR premium growth and severe local concentration. Louisiana shows how a dual-storm shock can multiply a residual book’s policies without needing Florida’s litigation overlay.

The exit-pressure scatter in the dashboard pairs admitted appetite indices (2018 = 100) against residual share by sub-market. Coastal Florida, Gulf Louisiana parishes, and California high-fire counties cluster in the low-appetite / high-residual quadrant. Metro California and northern Louisiana sit closer to the historical admitted equilibrium. Geography inside the state matters as much as the state label.

Caveats, definitions, and what the series are not

These series are not a single NAIC HO-3 premium tape split by ZIP. Florida premium shares lean on Citizens’ published market-share reports. California policy shares lean on CDI new-and-renewed counts; California premium shares for early years are carried or estimated where FAIR Plan fiscal-year premium is the better primary disclosure. Louisiana premium shares before the 2022 policy snapshot are desk estimates anchored to disclosed policy counts and residual rate posture. Surplus-lines shares are especially soft at state grain.

Coverage is not comparable dollar-for-dollar across residual designs: a California FAIR fire policy plus DIC wrap is not a Florida Citizens multiperil policy. Depopulation after Florida’s peak can move policies into specialty admitted carriers that did not exist in the 2018 baseline — so “admitted share recovery” is not automatically a return to legacy national brands. Non-renewals mix insured-initiated moves with carrier exits; CDI notes that most non-renewals are still insured-driven even when company-initiated non-renewals spike in fire-exposed counties.

Treat the dashboard’s estimated years as order-of-magnitude extensions consistent with disclosed anchors, not as regulatory filings.

What desks should watch next

Three observables matter more than another round of “insurers flee the coast” headlines. First, residual premium share, not just policy count — Florida’s peak was a premium story as much as a policy story. Second, takeout and depopulation velocity after reforms: Florida’s 2024–25 reverse shows residual stocks can shrink quickly when capital returns under new rules. Third, surplus-lines penetration in the same counties where residual shares rise: if surplus absorbs the high-risk tail while residual shares stabilize, the political pressure eases even if admitted appetite never fully returns.

For now the coastal ledger is clear enough. Admitted homeowners premium did leave Florida, California, and Louisiana residual channels — fastest in Florida’s premium share, most dollar-explosive in California’s FAIR premium multiple, and most storm-timed in Louisiana’s policy surge. The dashboard is built to keep those three speeds on the same screen.

Sources

• Citizens Property Insurance Corporation Florida Market Share Reports (YE 2018–2023; Q3 2024 series)
• California Department of Insurance, Summary on Residential Insurance Policies and the FAIR Plan (Jan 13, 2025)
• Milliman insight on California homeowners market and FAIR Plan growth (dwelling counts and FY premium)
• Public Affairs Research Council of Louisiana Citizens residual-market snapshot (Nov 2022)
• NAIC Market Conduct Annual Statement homeowners report hub (state/zone context)
• S&P Global Market Intelligence surplus- vs admitted-homeowners premium growth (2022–2023), via secondary reporting