The insurance-risk check most buyers skip, and the suburbs it’s starting to rule out

Insurance affordability is the quiet variable rewriting Australian property risk. It doesn’t show up in a REA listing. It doesn’t appear in the sales agent’s comparables. It only shows up when you renew a policy, apply for a loan, or try to sell to the next buyer who has done a quote before writing the offer. Most buyer’s agents skip it. We stopped being able to.

What the data actually says

• Climate Council / Climate Valuation modelling in 2025 named specific suburbs where insurance is projected to become effectively unaffordable by 2035.
• The ABC has reported that around one in ten Australian homes could be uninsurable, or economically equivalent, within a decade.
• General insurers absorbed roughly $1.8bn in extreme-weather claims across 2025, and are re-rating flood, cyclone and bushfire exposure aggressively into renewal premiums.
• Lenders are watching. Where insurance is unavailable at any price, a loan is not really available either.

The four insurance risk vectors that matter to Australian investors

• Riverine flood. The single largest re-rating driver. If the property sits inside a 1-in-100 flood extent, expect either premium loading or exclusions, and expect them to grow.
• Cyclone. North of the 26th parallel, cyclone rating dominates the premium. Some insurers have quietly stopped writing new policies in specific postcodes.
• Bushfire. BAL rating (Bushfire Attack Level) drives both premium and build cost. BAL-40 and Flame Zone properties are increasingly difficult to insure.
• Coastal erosion / storm surge. Not yet fully priced, but insurer exposure is climbing. Watch the SEQ, Central Coast and Illawarra fringes.

The check we now run before recommending any suburb

• Pull an indicative building & landlord quote for the actual address before contracts, not after settlement.
• Check the flood overlay against council and state hazard mapping, not just the seller’s disclosure.
• For SE QLD, review the Brisbane City Council flood awareness map. For NSW, use the DPHI flood risk viewer.
• Cross-check against Climate Valuation or equivalent hazard-projection data for the 2035 and 2050 horizons.
• Ask two independent brokers for the same policy. If one quotes and the other declines, that’s the signal.