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Australia's housing market is heading for its first national quarterly price decline since March 2023, triggered by a record 54,000 dwellings added in the December 2025 quarter, 25% above the long-run average. The full impact won't be felt until September 2027, due to a seven-quarter lag between supply hitting the market and prices responding. When it lands, it will be compounded by at least two further forecast rate rises. The decline won't be uniform: NSW and Victoria, which together represent 57% of national dwellings, will bear the brunt, while Queensland, South Australia and Western Australia continue to post double-digit growth as investors reallocate capital away from unaffordable southern capitals. A national decline of 0.32% in a single quarter is modest on paper, but the significance lies in what it signals, a potential cyclical peak in Australian housing prices if supply keeps growing and rates stay elevated.
New research reveals Australia's record dwelling supply surge is forecast to trigger the first national quarterly price decline in more than three years, with modelling pointing to a potential market peak in 2027.
Australia added 54,000 homes in the December 2025 quarter, the largest single-quarter increase in residential dwelling stock since 2016, and 25% above the quarterly average of 43,200 recorded since that year. Primara's modelling shows the largest price impact of new supply nationally happens 7 quarters later, meaning the full weight of this surge is forecast to land in the September 2027 quarter, compounded by at least two further predicted cash rate rises.
Why the Lag, and the Size of the Surge, Both Matter
The seven-quarter lag means markets do not respond to new supply immediately. But the scale of the December quarter surge amplifies the eventual impact considerably. Had supply growth come in at the average quarterly rate, 0.36% instead of the recorded 0.47%, modelling predicts the September 2027 quarter would have produced a national price increase of 1.15%, rather than a decline of 0.32%. That 1.47 percentage point swing illustrates just how much weight a single above-average supply quarter can carry when it lands.
In some states, the impact arrives faster: NSW and Queensland absorb new supply in six quarters, while the Northern Territory takes eight.
A Divided Nation: Winners and Losers by State
The national decline masks a sharp divide. NSW and Victoria, representing approximately 57% of national dwellings, are the most supply-sensitive and rate-sensitive markets, and will drive the national result:
NSW: Prices forecast to grow just 2.4% over 18 months to $1.33m, with a 1.49% quarterly decline arriving as early as June 2027
Victoria: Forecast down 1.44% in the September 2027 quarter, with multiple negative quarters during 2026, and a cumulative 21-month decline of 1.5% to $919,400
Tasmania and ACT: More modest declines of 0.3% and 0.7% respectively over the 7 quarters
Meanwhile, markets less exposed to the supply surge continue to grow strongly:
Queensland: Up 13.1% to $1.206m
South Australia: Up 13.8% to $1.067m
Western Australia: Up 16.3% to $1.179m
Northern Territory: Up 10.7% to $642,200
The Investor Reallocation Effect
The model shows a counterintuitive pattern in Western Australia and South Australia: prices in these markets rise when interest rates increase. The likely explanation is capital reallocation, with investors shifting out of unaffordable Sydney and Melbourne into comparatively cheaper markets when borrowing capacity tightens. In Western Australia, investor loans have grown from 7,433 to 25,963 annually over the last five years, a 250% increase that illustrates the scale of capital now flowing into the state.
A September 2027 quarterly decline of 0.32% nationally would be modest in isolation, but would represent the first negative quarter since March 2023 and, if supply continues to grow and rates remain elevated, could mark a cyclical peak in Australian housing prices.
