Flood Insurance in Australia: Why Premiums Are Skyrocketing and What Buyers Can Do

Home and contents insurance has become one of the most significant ongoing costs for Australian property owners in flood-affected areas. Following the catastrophic flood events of 2011 and 2022, Australian insurers have fundamentally reassessed the pricing of flood risk, and for owners of flood-designated properties, the financial consequences have been substantial.

Understanding why premiums have increased, where the market is heading, and what buyers can do to protect themselves is essential knowledge for anyone considering a property with any flood overlay designation.

The escalation in flood insurance premiums in Australia has several compounding causes.

Reinsurance repricing is the primary structural driver. Australian insurance companies transfer a portion of their catastrophe risk to international reinsurance markets. Following the 2022 floods, international reinsurers significantly increased the cost of Australian catastrophe reinsurance, citing climate-related increases in loss frequency and severity. This reinsurance cost increase flows through directly into retail insurance premiums.

Improved data and modelling capability has allowed insurers to price individual property risk more precisely than was previously possible. Insurers now have access to granular flood mapping data, property-specific flood modelling, and historical claims records at postcode and even property levels. This precision allows them to identify high-risk properties that were previously priced into averages and apply risk-specific premiums.

Capital adequacy requirements mean that insurers must hold sufficient capital reserves against their potential claims liabilities. Following the 2022 losses, the required reserves for flood-exposed portfolios increased, putting additional upward pressure on premiums.

The premium increases on flood-affected properties have been documented in multiple reports. The Australian Competition and Consumer Commission (ACCC) released its Northern Australia Insurance Inquiry reports detailing the scale of premium increases in flood-prone areas. While the inquiry focused on Northern Australia, its findings regarding the drivers of premium increases are broadly applicable to South East Queensland.

Testimonies from homeowners in flood-affected Brisbane suburbs following 2022 describe premium increases of 50 percent to 400 percent on renewal. Properties that were insured for $2,200 per year before the floods received renewal offers of $8,000 to $15,000. Some long-term policyholders received non-renewal notices, requiring them to find cover elsewhere at even higher cost.

The most important action available to a buyer considering a flood-affected property is to obtain insurance quotes before making any commitment. This step, taken before an offer is made, provides the most accurate possible indicator of what insurance will cost as an owner.

Contact at least three mainstream insurers and one specialist underwriter. State the property address, confirm the flood overlay category, and ask specifically for a quote including flood inundation cover. The premiums quoted will vary between insurers and will collectively give you a market view of the risk.

If premiums are significantly higher than what your budget can accommodate, this is important information to have before commitment rather than after settlement.

A PropDex due diligence report at propdextest.com.au identifies the flood overlay status of any Queensland property, giving you the information you need to have an informed conversation with insurers before you proceed.

The Queensland and Australian governments have introduced several measures aimed at flood insurance affordability, with mixed results.

The Household Resilience Programme (HRP) provides funding assistance for property owners in certain flood-risk areas to install flood mitigation measures (such as raised platforms, flood barriers, and sealed openings) that can reduce the depth of flood inundation and consequently the insured loss in future events. Insurers do not always immediately reflect mitigation measures in premium reductions.

The Australian Reinsurance Pool Corporation (ARPC) Cyclone Reinsurance Pool, which began operating in 2022, provides reinsurance for cyclone and cyclone-related flood risk in Northern Australia and parts of Queensland. It aims to reduce premium increases driven by reinsurance cost, but its geographic scope and product coverage limitations mean it does not directly address flood insurance affordability across all Brisbane flood-affected properties.