First Half
Every day, thousands of Americans complete one of the largest financial transactions of their lives. Before a lender releases hundreds of thousands of dollars, it verifies the borrower’s income, credit history and the property’s value. It also asks a quieter question that rarely receives attention outside the mortgage industry:
Can this property be insured?
Most buyers never think about that requirement again. Yet it reveals something fundamental about modern finance. Banks do not simply lend against houses. They lend against houses expected to remain insurable throughout the life of the loan. Lending standards established by organizations such as Fannie Mae and Freddie Mac therefore require adequate hazard insurance before a mortgage can be originated and maintained. Insurance is not merely another product purchased alongside a home. It is one of the conditions that allows mortgage credit to exist.
Because that requirement is almost always satisfied, it has faded into the background of the home-buying process. Buyers arrange coverage, lenders verify it and transactions close without interruption. The financial system works so smoothly that most participants never notice how dependent it is on one assumption: that acceptable insurance will always be available when a property changes hands. California is exposing what happens when that assumption becomes less reliable.
Over the past several years, major insurers including State Farm and Allstate reduced or paused new homeowner business across large parts of California. Wildfire losses, rising reconstruction costs and regulatory constraints made the market increasingly difficult to underwrite on existing terms. Researchers at Stanford University found that seven of California’s twelve largest insurers had reduced participation, average homeowner premiums had increased by roughly 84 percent since 2020, and more than one in seventeen recent California mortgages depended on coverage from the California FAIR Plan because conventional insurance was unavailable.
Taken individually, each figure describes pressure within an insurance market. Together they reveal pressure within a credit market. Homeowners purchase insurance hoping never to file a claim. Lenders require insurance because the house secures the loan. When acceptable coverage becomes scarce, the question is no longer simply whether future losses can be compensated. It becomes whether new loans can be issued under the same conditions as before.
That is why California’s insurance market deserves attention beyond California itself. The earliest economic effects of climate risk do not necessarily appear in burned neighbourhoods or rising claims payments. They appear inside routine lending decisions, where properties that once moved effortlessly through the financing process begin encountering new friction.
The California FAIR Plan shows how changing insurance conditions begin reshaping the institutions that support housing finance.
Originally established as an insurer of last resort, the FAIR Plan was intended to provide coverage only after the private market had failed. It existed to prevent a relatively small number of otherwise uninsurable properties from falling completely outside the insurance system. It was never designed to become an important component of everyday housing finance.
Recent research suggests that its role is changing. Stanford researchers found that more than one in seventeen recent California mortgages relied on FAIR Plan coverage because conventional insurance was unavailable. Researchers at Berkeley Haas and Brookings have likewise argued that the FAIR Plan increasingly performs a broader financial function than originally intended. That does not mean it has replaced the private insurance market, nor does it suggest California’s insurance system has become permanently dependent upon it. It does indicate that an institution created as an emergency backstop is increasingly helping ordinary mortgage transactions reach completion.
Mortgage markets depend on predictability. Buyers expect to obtain insurance, lenders expect collateral to remain protected and sellers expect transactions to close on schedule. As private insurers retreat from parts of the market, each of those expectations becomes harder to take for granted.
An institution created for exceptional circumstances is increasingly supporting ordinary mortgage transactions. That shift is more significant than it first appears. Residual insurance programmes were designed to serve a small number of properties the private market would not insure. They were never intended to become part of the normal machinery of housing finance. Yet as conventional coverage becomes harder to obtain in parts of California, the FAIR Plan increasingly enables transactions that would otherwise struggle to satisfy existing lending requirements. Homebuyers may still complete their purchases, but they do so through a financial architecture that has quietly become more dependent on an institution originally designed as a backstop rather than a foundation.
Mortgage lending does not change because lenders suddenly adopt stricter rules. The rules already exist. What changes is how easily borrowers can satisfy them. A buyer who once secured insurance in a few days may now spend weeks searching for acceptable coverage or accept substantially higher premiums to complete the purchase. Developers planning projects years before completion face a different uncertainty. They must judge whether future buyers will encounter an insurance market very different from today’s. None of these decisions appears significant on its own. Together they make mortgage finance less predictable than it was when insurance could be taken for granted.
This is how financial systems usually register structural change. They do not wait for a dramatic market event before adjusting. They absorb new information through thousands of routine decisions that, viewed individually, appear entirely rational. A loan receives additional scrutiny. A project carries a higher financing cost. An investment committee demands greater confidence before approving long-lived assets in areas where future insurance conditions have become harder to judge. None of those decisions attracts public attention. Their significance lies in their accumulation.
The next question is whether those changes remain confined to individual mortgages or whether they travel further through the financial system. Answering it requires looking beyond homeowners and lenders to the architecture of housing finance itself.
The Gatekeeper Economy: How Insurance Quietly Began Deciding Where Capital Goes
Second Half
Most borrowers assume their relationship ends with the bank that approved the mortgage. In reality, that bank often holds the loan only briefly. After closing, many mortgages are sold into secondary markets, combined with thousands of others and converted into mortgage-backed securities purchased by pension funds, insurance companies, mutual funds, commercial banks and central banks around the world. A mortgage signed at a kitchen table in California may ultimately become part of the retirement savings of someone living thousands of miles away. That circulation of capital allows lenders to replenish their balance sheets and continue making new loans.
The investors buying those securities are not assessing individual homes one by one. They are purchasing pools of mortgages on the assumption that every loan entering those pools already satisfies established underwriting standards. One of those standards is that the property securing the mortgage carries adequate hazard insurance. By the time a loan reaches the secondary market, insurance has already performed its role: it helped ensure the collateral met the requirements that allowed the mortgage to be originated in the first place. The importance of insurance therefore lies less in protecting the investment after securitisation than in helping determine which mortgages qualify to become investment assets at all.
California does not show that mortgage-backed securities are already being materially repriced because insurers have reduced their presence in parts of the state. The available evidence does not support that conclusion. What it does reveal is an earlier point in the financial chain. If obtaining acceptable insurance becomes more difficult, originating mortgages that satisfy established underwriting standards also becomes more difficult. The first pressure appears where loans are created, not where they are ultimately traded.
Credit markets amplify small changes because lending decisions are repeated millions of times. A bank declining one mortgage has little economic significance. Thousands of lenders becoming slightly more cautious under similar conditions do. Mortgage standards influence not only who can buy homes today, but also which developments secure financing, which projects attract capital and which communities continue expanding. What begins as a local insurance constraint therefore becomes a broader financial signal, transmitted through the ordinary decisions that determine where credit continues to flow most easily.
The effects extend beyond individual home purchases because housing finance underpins community development itself. A new residential subdivision is followed by roads, schools, water systems, emergency services and years of public investment. Local governments plan for that growth expecting new housing to expand the property-tax base supporting those commitments. If financing becomes more selective, fewer developments move from planning to construction and fewer homes reach completion. The impact differs across communities and unfolds slowly, while employment, migration, planning policy, housing supply and interest rates continue shaping local outcomes. Insurance influences this process indirectly by affecting one of the financial conditions that allows sustained housing development.
The same mechanism appears outside residential housing. Consider a logistics warehouse expected to operate for thirty years. Before construction begins, lenders and investors estimate decades of operating costs, financing expenses and expected returns. Labour availability, taxation, regulation, energy prices and demand have always formed part of that calculation. Insurance increasingly joins them because climate risk affects both the long-term cost of protecting the asset and confidence that adequate coverage will remain available throughout its life. Insurance rarely determines whether a project proceeds by itself. It increasingly influences the financial assumptions used to judge whether that project remains commercially viable.
California is not important because it is the only place confronting climate risk. It is important because it compresses a process that unfolds more gradually elsewhere. In many regions, insurance remains abundant enough that changes in financing are difficult to detect. California’s combination of repeated wildfire losses, extensive mortgage lending and constrained insurance capacity makes those adjustments visible sooner. The state therefore functions less as an exception than as an early indicator. Other regions will experience different hazards and at different speeds, but the underlying sequence is likely to be familiar: insurance conditions change first, lending practices adjust next and the broader economic consequences emerge only later.
Insurance is no longer discussed only within the insurance industry. Institutions responsible for financial stability have begun examining it as a broader economic issue. The Bank for International Settlements and the Network for Greening the Financial System have both published work on how climate-related physical risks can affect financial systems, while researchers at Stanford University, Berkeley Haas and Brookings Institution have examined how insurance availability influences housing finance and mortgage markets. The shift in attention reflects a broader change: insurance is increasingly analysed not simply as a mechanism for paying claims, but as one of the institutions supporting credit creation, financial stability and long-term investment.
When insurance becomes less available or less predictable, the first consequences emerge inside credit markets, where mortgages are approved, developments are financed and long-term projects are evaluated years before any change becomes visible in wider economic statistics.
California’s experience does not show that climate risk has already redrawn the economic map, nor that insurance will become the dominant force determining where investment occurs. Labour markets, taxation, infrastructure, regulation and technological change will remain central to regional competitiveness. What California reveals is something more measured but potentially more significant: financial systems begin adapting to changing risks long before those adaptations become obvious in the wider economy. By the time slower development, shifting investment patterns or weaker regional growth become visible, many of the financial decisions shaping those outcomes have already been made. Seen in that light, insurance is no longer simply a mechanism for absorbing future losses. It is increasingly part of the financial infrastructure that determines where credit can continue flowing with confidence.
