Uninsurable properties: how climate risk is repricing Australian real estate
One in 25 Australian addresses now faces insurance premiums above $5,000 per year. In some flood- and cyclone-exposed areas, insurers have withdrawn entirely. The property market is slowly pricing in what the insurance industry already knows — and most buyers are finding out too late.
The affordability crisis is a data problem
The Actuaries Institute estimated in 2024 that approximately 520,000 Australian households face insurance affordability stress — defined as premiums exceeding one month's household income. In northern NSW, parts of southeast Queensland, and far north Queensland, the numbers are worse. Some communities report that 30-40% of households have dropped insurance coverage entirely.
This isn't happening uniformly. Two properties on the same street can have dramatically different premiums based on floor height, proximity to waterways, vegetation setback, or building construction. The insurer knows this — they use address-level risk models built from decades of claims data, engineering assessments, and catastrophe modelling. The buyer, typically, does not.
The information asymmetry is the core problem. Insurers have property-level risk data. Buyers have a suburb-level reputation and whatever the real estate agent chooses to disclose. By the time the buyer gets an insurance quote, they've already exchanged contracts.
What “uninsurable” actually means
Strictly speaking, very few Australian properties are technically uninsurable. What happens in practice is a sequence of escalation:
- Premium loading. The insurer adds a risk premium based on hazard exposure. A property in a 1-in-100 year flood zone might see premiums 2-5x higher than a comparable property outside the zone.
- Excess loading. The insurer increases the flood or storm excess to $10,000-$25,000, making claims economically unviable for all but catastrophic events.
- Product withdrawal. The insurer stops offering flood cover entirely for that address, while still offering fire and theft. The property is technically insurable — just not for its primary risk.
- Full withdrawal. In extreme cases, all major insurers decline to offer any policy. This is rare but documented in parts of the Northern Rivers and far north Queensland.
The ACCC's Northern Australia Insurance Inquiry (2020) documented this progression in detail. Since then, the 2022 floods and subsequent events have accelerated the trend southward into the Hunter Valley, Hawkesbury-Nepean, and parts of Western Sydney.
How this affects property values
Academic research is beginning to quantify the impact. A 2023 study by the University of NSW found that properties in high-flood-risk areas in the Hawkesbury-Nepean experienced a price discount of 5-12% relative to comparable properties outside flood zones, with the discount widening after the 2022 floods.
The mechanism is straightforward: if annual insurance costs add $3,000-$8,000 to the cost of ownership, the capitalised value of that liability reduces what a rational buyer should pay. At a 5% discount rate, $5,000 per year in additional insurance costs equates to $100,000 in property value destruction.
But the market doesn't adjust smoothly. Most buyers don't check insurance costs before purchase. Vendor disclosure requirements in NSW (s10.7 certificates) indicate flood planning area status but don't quantify the financial exposure. The price adjustment happens after purchase, when the buyer discovers the true cost of ownership — and by then, the loss is locked in.
The bushfire dimension
Flood gets most of the attention, but bushfire insurance stress is equally significant in peri-urban areas. Properties assessed at BAL-40 or BAL-Flame Zone under AS 3959 face substantial premium loadings. More critically, the cost of building to BAL standards adds $50,000-$200,000 to construction costs — a factor that affects development feasibility and renovation economics.
The Black Summer fires (2019-20) and subsequent events triggered a recalibration of bushfire risk models across the insurance industry. Properties that were previously assessed as moderate risk have been reclassified. The NSW Bush Fire Prone Land map is updated periodically, and each update can shift the risk profile of thousands of properties.
Unlike flood, where mitigation infrastructure (levees, detention basins) can reduce risk, bushfire mitigation is primarily about vegetation management and building construction — both of which are the property owner's responsibility and ongoing cost.
Climate projections compound the problem
Current insurance pricing reflects historical claims experience with some forward-looking adjustment. But climate projections suggest that the current hazard profile is a floor, not a ceiling. NARCliM 2.0 projections for NSW show:
- Increased intensity of rainfall events (more water in shorter periods)
- More days above 35°C in Western Sydney (from ~10/year to ~30/year by 2060 under SSP3.70)
- Extended fire seasons with higher Forest Fire Danger Index values
- Sea level rise affecting coastal erosion and tidal inundation
For property buyers, this means that today's insurance premium is likely the cheapest it will ever be. A property that's marginally affordable to insure today may become genuinely unaffordable within 10-15 years — well within the typical mortgage term.
What buyers can do
The most effective protection is pre-purchase due diligence. Before exchanging contracts:
- Get an insurance quote before you bid. Call at least two insurers with the address and ask for a full quote including flood, storm, and bushfire cover. The quote tells you more than any flood map.
- Check the flood planning status. Request the s10.7 certificate (your conveyancer should do this) and check whether the property is in a flood planning area. If it is, ask for the flood study data to understand depth and frequency.
- Check Bush Fire Prone Land status. The NSW RFS publishes these maps. If the property is on BFPL land, a BAL assessment will be required for any future development — and the BAL rating affects insurance.
- Look at climate projections. What does the hazard profile look like in 2040 or 2060? Properties in areas with worsening projections face compounding insurance costs over the life of a mortgage.
- Use property-level risk data. Suburb-level assessments are insufficient. Two properties 200 metres apart can have completely different flood, bushfire, and heat exposure depending on elevation, vegetation, and watercourse proximity.
The role of disclosure
There is growing momentum for mandatory climate risk disclosure at the point of property sale. The Productivity Commission's 2024 report on natural disaster funding recommended that state governments require standardised hazard disclosure in vendor statements. Several states are reviewing their disclosure frameworks.
In the interim, the information gap creates both risk and opportunity. Buyers who do their due diligence can avoid properties with hidden climate liabilities. Vendors who can demonstrate low climate exposure may achieve price premiums as the market becomes more risk-aware.
For conveyancers and buyer's agents, climate risk assessment is becoming a professional obligation. Failing to advise a client about material flood or bushfire risk exposure creates professional liability. The tools to check are now available — the question is whether the profession integrates them into standard pre-purchase workflows.
Check the climate risk profile before you buy
PlotDetect provides free, instant climate risk assessment for any NSW address — flood depth, bushfire BAL estimation, heat stress projections, and coastal hazard data from government sources. No account required.