The climbing cost of climate change for the Australian property market
The insurance premium gap between flood affected and non-flood affected homes is significant
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Climate change is already affecting home values due to the impact of more severe weather events and rising home insurance premiums, and the cost of building is likely to rise as regulatory changes designed to enhance climate resilience alter building codes and zoning laws, according to a new report.
The National Housing Supply and Affordability Council describes climate change as an emerging trend that is raising the cost and complexity of supplying more housing. In its newly released State of the Housing System report, the council discusses how climate change is reducing the value of some homes when major weather events cause flooding or other natural disasters.
“The price differential between flood-affected and non-flood affected homes has been estimated to be up to 35 percent a year after a flooding event,” the report says. “Furthermore, the RBA estimates around 7.5 percent of properties are in areas that could experience price falls of at least 5 percent due to climate change by 2050.”
More than one million households are struggling to afford home insurance, and rates of non-insurance are increasing due to the cost. For example, the Australian Competition and Consumer Commission estimated that 40 percent of homes in Northern Western Australia were uninsured in 2020.
“Climate change is causing home insurance premiums to rise across Australia, adding to already elevated housing costs. Homeowners in areas considered at–risk of natural disasters are expected to see insurance premiums rise further or have difficulty obtaining insurance due to heightened risks.”
More frequent and severe weather events such as cyclones and bushfires, as well as coastal erosion and flooding from rising sea levels, present risks to housing safety. More than 3,000 homes were lost in the 2019-20 bushfire season, causing $2.3 billion in insurance losses. The report says the predicted direct cost of natural disasters to the economy and housing will be $35.2 billion per year by 2050.
Climate change and net-zero targets could raise the cost of building new homes, the report says. “Regulatory changes to enhance climate resilience will alter building codes and zoning regulations.
Developers facing higher compliance costs may have difficulties meeting updated standards, potentially delaying or reducing housing availability.”
However, the report says the increased cost of building a home with climate-resistant materials and eco-friendly features is more than offset by lower energy costs over a property’s lifetime. The current minimum energy efficiency requirements within the National Construction Code are estimated to deliver a household–level benefit-to-cost ratio of 1.37, according to the report.
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The typically busy spring season for the housing market was a dud, and the summer isn’t looking much brighter.
Housing services companies like Zillow Group and Rocket RKT +3.78% were loud and clear last week on earnings calls: Rocket CEO Varun Krishna called the quarter through June “one of the toughest spring housing markets in years.”
Jeremy Hofmann, Zillow’s chief financial officer, said on a conference call that the company predicted earlier this year that the market for mortgages would be flat. “We actually now think it’s going to be down low-to-mid-single digits,” he said.
The rest of 2026 will remain challenging for mortgage origination volume, says KBW analyst Bose George. The question now is what happens in 2027. “If mortgage rates remain [around] 6.75%, I think that’s going to be challenging even for next year,” he says.
But what’s bad news for mortgage companies could be a positive for bargain hunters. Buyers can expect prices to grow more slowly—or mildly decline—with less competition as long as mortgage rates remain unpredictable.
Mortgage rates at the beginning of the year were solidly below year-ago levels, notes Zillow senior economist Kara Ng. But they surpassed last year’s levels recently, she adds, referencing Freddie Mac’s weekly survey of 30-year fixed mortgage rates. Last week’s reading, at 6.69%, was higher than year-ago levels for the first time in 2026.
“From the affordability point of view, it’s going to get more challenging in the second half of the year,” she says. “And when affordability gets more challenging, that impacts sales and home price appreciation.”
Mortgage application data tracked by the Mortgage Bankers Association has cooled since the beginning of the year. The trade group expects that the number of mortgage originations in the remaining two quarters will lag behind last year’s levels, after exceeding 2025 levels in the first half.
Rocket’s early-stage data—which the company told Barron’s it derives from its brokerage Redfin, demand for its mortgage products, and signs in its servicing portfolio that a homeowner is preparing to refinance or move—“leads us to expect the third quarter mortgage market to be smaller than the second,” Chief Financial Officer Brian Brown, said on the company’s call. He added that such an occurrence is “something the industry has not seen since 2022.”
Prices will be about flat nationally, Ng says. Zillow’s most recent forecast, which shows how values are expected to change in the year ending June 2027, show them dropping in roughly half of the 100 largest U.S. metros for which data is available.
Buyers aren’t rushing in at a time when mortgage costs are rising and unpredictable. But those with the right combination of patience and cash could stand to benefit. “If you are financially qualified to buy a starter home, you are facing less competition and you’re more likely to get a price cut,” Ng says.
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