Answer in brief
Australian home values fell 1.1% in September, the sixth monthly decline. Brisbane dropped faster than Sydney, while national annual growth was flat and borrowing conditions tightened.
The October release confirms a broader retreat
Australian home values fell 1.1% in September, Cotality’s October 1 release reports, extending the national decline to six consecutive months. Values stand 5.2% below their March 2026 peak. Brisbane records the largest monthly fall among the capitals, while Darwin is the only capital to move higher. The fresh development is the breadth of the retreat, which makes a story confined to Sydney or Melbourne increasingly incomplete.
For buyers and owners, the release answers two different questions: how fast values changed recently and where each market stands over a longer horizon. Neither is an individual valuation. A home’s location, attributes and condition still determine the comparables needed to assess a sale or purchase.
A monthly decline can coexist with annual gains
The national twelve-month change is 0.0%, despite the latest monthly fall. That means recent losses offset earlier gains over the annual comparison period; it does not mean September was stable. Darwin’s positive monthly and annual readings also show that the national average cannot be assigned to every city.
The selected-city table compares the same dwelling-value index across two horizons. It includes houses and units together, rather than mixing a house-only median with an apartment index. These are nominal percentage changes in modelled values, not completed transaction counts, rental yields or a discount available on every listing. Readers should retain both the geography and the observation period when quoting a result.
| Geography | September monthly change | Twelve months to September |
|---|---|---|
| Australia | −1.1% | 0.0% |
| Sydney | −1.4% | −7.0% |
| Melbourne | −0.7% | −6.2% |
| Darwin | +0.4% | +11.9% |
More listed stock can reflect slower turnover
Cotality’s research director Tim Lawless describes weaker turnover alongside rising advertised inventory in his dated analysis. The useful relationship is between the flow of newly listed homes and the speed at which the existing stock sells. Available stock can build even when fewer owners bring fresh properties to market, because homes remain unsold longer.
For someone searching locally, that distinction changes the practical task. More choice in advertisements is a reason to compare competing properties and their time on market. It does not establish that a vendor will accept a particular discount. Asking prices, revised listings and completed sale prices represent different stages of negotiation and should not be treated as one measure.
The index adjusts for the homes that happen to sell
Cotality describes its methodology as hedonic: it uses attributes such as bedrooms, bathrooms, land area and location alongside recent sales. This seeks to reduce the compositional bias that appears when a simple median changes because a different mix of homes transacts. The result is a modelled market indicator, not a direct price observation for every dwelling.
Its methodology page also says hedonic indices are revised monthly over a twelve-month window. Historical comparisons should therefore use a consistent release vintage. Mixing an old published monthly figure with a revised back series can manufacture a difference that reflects updating rather than a new market event. Our table uses the October release’s own reported horizons.
Cheaper housing faces a separate financing test
The RBA raised the cash-rate target by 25 basis points to 4.60% on September 29. Its statement explicitly acknowledges falling housing prices in most capitals and a noticeable decline in new housing loans, while explaining the decision through inflation pressures. The policy rate is not an individual mortgage offer and the decision is later than much of September’s housing activity.
The household implication is that a falling purchase price can coincide with tighter borrowing capacity. The housing index alone cannot calculate that trade-off. A buyer needs current loan terms, a deposit and income-based repayment estimates for the chosen property. Applying a national percentage decline to a personal borrowing limit would combine different measures without a valid calculation.
The October decision needs local evidence
The release documents a completed month of value estimates, not the size or timing of the next decline. Forecasts about 2027 remain projections and are not included as measured results here. The annual and monthly columns offer a more useful starting point than a claim that every Australian market is moving at the same pace.
For an October transaction, compare similar recent sales in the same area, check whether an advertised property actually remains available and obtain current financing figures. Owners considering a sale can track competing stock and local selling times. The evidence supports a wider downturn; the achievable price and repayment cost still require a specific home and a specific borrower.
Questions and answers
Is the 1.1% fall a change in asking prices?
No. It is the monthly change in Cotality’s hedonic Home Value Index, which uses sales and property attributes to estimate value movements. It is not a survey of sellers’ advertised prices.
How can September fall while the annual figure is flat?
The monthly and annual comparisons use different starting dates. Earlier gains can offset recent declines over twelve months. The figures therefore describe different horizons rather than a contradiction.
Does a lower price guarantee a more affordable mortgage?
No. Purchase price and borrowing capacity can move in opposite directions. Current lender terms, income, deposit and repayment obligations determine a household’s financing position.