bushfire corridors and eroding coastlines, leaving hundreds of
thousands of families financially exposed and a banking system
quietly absorbing risk it has not yet priced
| Key Points |
|
In the weeks after the 2022 Northern Rivers floods, residents of South Lismore began receiving letters. Not from emergency services. Not from the government. From their insurers.
The letters said, in the dry language of actuarial assessment, that their homes were no longer insurable. Some had lived there for thirty years. A few had just finished paying off their mortgages. What the letters really said was: you are on your own.
A 2024 survey by Resilient Lismore found that two-thirds of households in the flood zone had no flood insurance, the majority because they could not afford it. 2
Some had been quoted annual flood premiums of twenty thousand dollars or more. Others had simply been refused.
For a town that sits in a river basin with a documented flood history stretching back to the colonial era, major floods in 2020, 2017, 2015, 2013, 2012 and the catastrophic 14.4-metre inundation of 2022, the retreat of insurance capital was not a surprise to hydrologists. It was a surprise to everyone who had a mortgage.
Lismore is not anomalous. It is instructive. Across Australia, a structural shift is occurring in the relationship between climate risk, private insurance, residential property and bank lending that is playing out below the surface of official discourse and well ahead of policy response. The question is no longer whether insurance deserts will form. They are forming now. The question is what they will leave behind.
The Scale of the Protection Gap
Australia's prudential regulator published its landmark Insurance Climate Vulnerability Assessment in early 2026. The headline figure is stark. Approximately one in seven Australian households is currently uninsured. 1
By 2050, under both modelled scenarios, that figure rises to one in four. That is roughly one million additional households losing insurance protection over twenty-five years, at a rate of around 40,000 families every year. The five major insurers that participated, Allianz, Hollard, IAG, QBE and Suncorp, together hold around 80 per cent of the Australian home insurance market by gross written premium. Their own internal modelling produced those numbers, under APRA's supervision.
Between 2010 and 2025, Australian home insurance premiums rose at an average annual rate of 7.2 per cent. Wages grew at 3.1 per cent annually over the same period. 3
That gap has been compounding for fifteen years. In the Greater Sydney area alone, average home insurance rose by as much as 66 per cent since 2020. The Actuaries Institute estimated in 2024 that 1.6 million Australian households were already experiencing some form of insurance affordability stress.
Climate Valuation, a property risk analytics firm, puts the current number of homes that are either uninsurable or practically unaffordable to insure at around 380,000, with the trajectory toward one in ten by 2035.
The Insurance Council of Australia has documented that insurance claims from catastrophic events rose by nearly 50 per cent in the five years to 2024, while around 1.2 million properties face some level of flood risk. Weather-related insured losses exceeded seven billion dollars in 2022 alone. 6
Of this, 80 per cent of the uninsurability risk nationally is attributable to riverine flooding. Bushfire and flash flooding account for most of the rest. Coastal erosion, slower and harder to model, is the third axis of a problem that planning systems have consistently underweighted.
The Mechanics of Disappearance
When insurers raise premiums or exclude specific perils from standard policies, they are not acting arbitrarily. They are translating data from third-party hazard modelling suites, layered over address-level exposure databases, into actuarial pricing. Risk Frontiers, Geoscience Australia's flood mapping datasets, satellite-derived coastal erosion models and global reinsurance pricing signals all feed into the algorithms that determine what a household pays.
The insurer does not always disclose which maps govern a given address. The household often has no mechanism to challenge the assessment.
In coastal erosion zones like Wamberal on the NSW Central Coast, properties on the ocean side of a single street can face premiums an order of magnitude higher than those fifty metres inland. The automated underwriting logic responds to modelled inundation probability and retreat projections. It does not respond to the emotional reality of a family that bought a home, raised children there and now cannot sell it to anyone with a mortgage. 7
Banks require proof of insurance as a condition of settlement. Without insurance, the property cannot be sold to a mortgaged buyer. It becomes, in the blunt language of the market, a cash-buyer asset. That transition is not hypothetical at Wamberal. It is already occurring.
A significant driver of premium escalation is the international reinsurance market, which prices Australian catastrophe risk against a global portfolio of climate-exposed assets. As global losses from extreme weather have risen, reinsurance capital has become more expensive and, in some lines, more restricted. The cost is passed directly to the retail insurer and then to the consumer.
In disaster-prone regional Queensland and northern New South Wales, the combined effect of local claims histories and international reinsurance repricing has produced the premium levels that now render entire postcodes uneconomic for standard household insurance products.
What Happens to a Mortgage
Home insurance is not optional for mortgaged property in Australia. It is a contractual condition of the loan. Banks require coverage for the life of the mortgage, and most lending contracts specify that a lapse in insurance constitutes a technical default. APRA's 2025-26 Corporate Plan is explicit on this point: declining insurance coverage among borrowers exposes banks to greater losses from climate risk. 8
A borrower who cannot obtain affordable insurance is, technically, in breach of their mortgage terms from the moment the policy lapses.
In practice, most Australian banks do not actively monitor post-settlement insurance compliance at the individual loan level. The mechanisms are ad hoc: periodic reminders at renewal, reliance on borrower self-reporting, occasional checks triggered by a disaster event. There is no centralised system that flags an individual mortgage as non-compliant when the insurance policy expires unrenewed.
The exposure accumulates quietly. As APRA's Insurance CVA makes clear, a widening protection gap increases both the probability of mortgage default and the size of the loss when default occurs, because an uninsured damaged property may no longer cover the outstanding loan amount.
Reserve Bank research from 2024 found that residential mortgage-backed securities issued by small regional banks and credit unions carry disproportionately higher physical climate risk. 5
The RMBS market has not yet fully incorporated this exposure into credit enhancement structures. Regional lenders, by the nature of their geographic concentration, hold loan books with larger proportional exposure to high-risk postcodes than the major banks. If property values in those postcodes deteriorate materially, driven by uninsurability and the contraction of the mortgage market, the credit quality of those loan books deteriorates with them.
The Big Four banks conducted climate stress tests under APRA supervision in 2022. They predicted they would respond to higher climate risk by cutting back on high loan-to-valuation lending and reducing exposure to higher-risk regions. That rational commercial response, if enacted systematically, becomes a self-fulfilling driver of property devaluation.
When banks withdraw lending from a postcode, cash-only transactions become the norm. Prices fall. Equity erodes. Owners who financed against a higher valuation find themselves underwater. 9
Property Values and the Price of Risk
Research published in early 2026, drawing on home sales data and digital flood maps from the Hawkesbury-Nepean Valley, found that properties in the 1-in-100-year annual exceedance probability flood zone sold at an approximately 11 per cent discount compared to equivalent properties outside the zone. 4
In Richmond, a town of around 14,500 people in the valley with five major floods between 2020 and 2022, that translated to a median discount of around $89,000. The research noted that the discount reflected standard modelled flood risk but that buyers were systematically underweighting the far more destructive low-probability, high-severity flood events that the valley is capable of producing.
Insurers have already updated their pricing to account for these extreme events. The gap between what the market discounts a property for and what insurers charge to cover it signals something uncomfortable: the insurance pricing is ahead of the transaction pricing. Property buyers are still absorbing risk they have not fully priced. When a major flood event reprices the risk in a single season, the adjustment is sudden and severe.
In coastal erosion zones, the dynamics are structurally different. As insurance for the built structure disappears, the value of a beachfront or estuarine property collapses toward land value alone.
At places like Wamberal Beach on the NSW Central Coast, where homes have been progressively threatened by erosion and where insurers have retreated from structural coverage, a property that commanded a premium for its ocean outlook increasingly holds its value only in the land parcel, and even that becomes uncertain as the shoreline moves. 7
The structure itself becomes worthless on the open market to anyone who cannot finance it and cannot insure it.
In Queensland, Climate Council modelling projected that one in sixteen homes statewide, or around 193,000 dwellings, could be classified as high-risk for insurance purposes by 2030. Federal electorates including Moncrieff, Wright, Griffith and Maranoa dominated the national top ten. In the highest-risk areas nationally, the proportion of properties facing effective uninsurability reaches 27 per cent.
A Socioeconomic Filter
The population bearing the greatest uninsurability risk is not randomly distributed. Flood plains, older riverine settlements and low-lying coastal towns disproportionately house working-class families, retirees on fixed incomes and people without the financial reserves to relocate. In Lismore's flood zone, Resilient Lismore's survey data documents a population with significant socioeconomic disadvantage. Affordability was the dominant reason for absent coverage. 2
People who had returned to high-risk locations simply because they had nowhere else to go found insurers would not cover them at any price.
The rental dimension compounds this. When a landlord's insurance premiums rise sharply, those costs are absorbed first by the landlord and then passed to tenants. In a regional rental market with limited vacancy and housing stock already constrained by disaster damage, renters have little leverage to resist. The insurance cost effectively becomes an undisclosed component of the rent. The tenant carries the cost but not the coverage.
For elderly property owners who lack the liquidity to sell into a depressed market and the physical capacity to relocate independently, the situation approaches a permanent trap. Their homes, which often represent the primary store of intergenerational wealth for working-class families, are losing insurable value in real time.
The ability to pass that asset to the next generation, mortgaged, insured and functional, is degrading. When the next major disaster strikes an uninsured community, the recovery will be financed by the household, by emergency government payments, or not at all.
The Governance Gap
The Northern Australia Cyclone Reinsurance Pool, established by the federal government in 2022 with a ten billion dollar backstop, demonstrated that public intervention can stabilise a private insurance market under acute climate pressure. When Cyclone Alfred was declared an insurance catastrophe in early 2025 with more than 63,000 claims lodged, the pool's structure meant that consumers were largely shielded from sharp premium spikes. 6
No equivalent mechanism exists for flood, the peril responsible for 80 per cent of Australia's uninsurability risk.
The Insurance Council of Australia is now lobbying for a government-backed Flood Defence Fund, arguing that a structural equivalent to the cyclone pool is the only mechanism capable of preserving affordable cover in flood-exposed communities at scale.
The analogy with Florida's Citizens Property Insurance Corporation is instructive as both a model and a warning. Florida's insurer of last resort was originally conceived as a temporary backstop. It became, over two decades, the dominant insurer in the state, absorbing risk that private markets would not write and accumulating contingent public liabilities in the process.
Local governments in high-risk zones face a compounding fiscal problem. Their rate revenue is assessed against property values. As uninsurability drives down those values, the municipal rate base erodes. Infrastructure maintenance, emergency preparedness and the mitigation works required to reduce insurance risk all cost money that a shrinking rate base cannot reliably generate. The councils that most need levee upgrades and drainage improvements are the ones with the least financial capacity to fund them.
The planning system's role in creating this exposure cannot be avoided. Residential lots were approved across Australian flood plains and high-severity bushfire zones for decades by local councils that either could not foresee or chose not to confront the climate trajectory. In many cases, developer appeals overrode council refusals that had been grounded in flood risk.
The structures built under those approvals are now the inventory of the insurance desert. A resident of South Lismore who bought on a flood plain because that was what was available, at a price they could afford, in the town where their family lived, had no individual means to anticipate that their street would one day be deemed uninsurable by an algorithm in an underwriting office in Sydney.
Looking Forward
The contraction of private insurance from Australia's highest-risk residential zones is not a failure of the insurance market. It is the market communicating a signal that the planning system, the banking sector and successive governments have been reluctant to hear. Risk that cannot be priced cannot be insured. Risk that cannot be insured cannot be mortgaged.
Property that cannot be mortgaged cannot be sold at values that reflect what households paid for it. That sequence, playing out in slow motion in Lismore, in Richmond, in Wamberal, in northern Queensland, is the real estate equivalent of a balance sheet reckoning.
APRA will release further findings from its Insurance Climate Vulnerability Assessment to federal government and key agencies including the National Emergency Management Authority.
The data will sharpen policy choices that are already uncomfortable: whether to subsidise insurance in zones that climate science says should not bear permanent residential development; whether to expand government-backed insurance pools knowing the contingent fiscal risk; whether to mandate managed retreat from the highest-exposure areas and at what compensation. None of these choices is without cost. The question is who bears it.
What is clear from the trajectory is that the cost of inaction accumulates faster than the cost of intervention. Between 2015 and 2024, the protection gap in Australia meant that 33 per cent of economic losses from natural catastrophes went uninsured, against a global average of 57 per cent. Australia, in other words, was already absorbing an unusually high proportion of its disaster losses without insurance cover.
Every year that the protection gap widens, the bill deferred to households, to governments and to the financial system grows larger.
The letters arriving in Lismore after 2022 were the beginning of an accounting that the rest of the country has not yet opened.
References
1. Australian Prudential Regulation Authority. 2026. Insurance Climate Vulnerability Assessment: One in Four Australian Homes Projected Uninsured by 2050. APRA.
2. Resilient Lismore. 2024. 2024 Lismore Flood Zone Survey and Outreach Project. Resilient Lismore.
3. Insurance Business Australia. 2026. One in Four Australian Homes Will Be Uninsured by 2050, Regulator Warns. Insurance Business.
4. The Conversation. 2026. We Pay Less for Houses in One-in-100-Year Flood Zones, But Overlook Risks of More Devastating Floods. The Conversation.
5. Reserve Bank of Australia. 2024. Assessing Physical Climate Risk in Repo-Eligible Residential Mortgage-Backed Securities. RBA Bulletin.
6. Money Magazine Australia. 2025. Uninsurable: The Truth About Australia's Flood Insurance Crisis. Money Magazine.
7. Australian Property Update. 2025. Flood, Fires, and Coastal Erosion: Assessing Property Risks. Australian Property Update.
8. Australian Prudential Regulation Authority. 2025. APRA Corporate Plan 2025-26. APRA.
9. Investing.com. 2022. Australian Banking System Cushioned for Imminent Climate Change-Related Risks, Regulator Says. Reuters/Investing.com.
10. Lismore City News. 2023. Uninsurable, Unsellable, Unrentable: Flood Insurance Inquiry Welcomed to Protect Homeowners. Lismore City News.
11. Green Central Banking. 2025. Australia and NZ Face Home Insurance Crisis Due to Climate, Experts Warn. Green Central Banking.
12. Reserve Bank of Australia. 2025. Financial Stability Review, October 2025: Resilience of the Australian Financial System. RBA.
13. Climate Council of Australia. 2022. Uninsurable Nation: Australia's Most Climate-Vulnerable Places. Climate Council.
No comments :
Post a Comment