Low-Density Suburbs Outperform by 3.1% Over Four Years
Suburbs away from high-rise towers and dense urban cores grow faster. We tested 272,958 property sales across a decade to measure the gap.
What Is the Urban Heat Index?
Some suburbs are dominated by standalone houses on generous blocks. Streets are quiet. There are no apartment towers on the skyline. These are the suburbs that score highest on the Urban Heat Index.
Other suburbs sit in the middle of dense urban cores. Apartment blocks rise above the streetscape. Housing is tightly packed. Turnover is high. These suburbs score lowest on the index.
The model combines three variables related to housing density and building type into a single score for every suburb in Australia. A high score means lower density and more houses. A low score means more apartment towers and tighter urban form.
The name "Urban Heat" reflects the idea that dense, built-up areas absorb more market pressure. The inverse of that density is what drives outperformance.
Performance Over Time
The chart below tracks the 4-year annualised growth rate for the top quartile and bottom quartile of suburbs. The top quartile (blue) sits above the bottom quartile (red) in the vast majority of quarters.
Consistency Across 24 Sample Dates
We tested the signal at 24 different points in time between 2012 and 2022. The top bin outperformed at 22 of those dates, and the result was statistically significant each time. Only two dates showed neutral results.
| Date | Outperformance (4yr) | Significant? |
|---|---|---|
| 2012-03 | +2.8% | Yes |
| 2012-09 | +3.4% | Yes |
| 2013-02 | +3.9% | Yes |
| 2013-07 | +4.2% | Yes |
| 2013-12 | +4.5% | Yes |
| 2014-05 | +4.3% | Yes |
| 2014-10 | +3.8% | Yes |
| 2015-04 | +3.4% | Yes |
| 2015-09 | +3.1% | Yes |
| 2016-02 | +2.5% | Yes |
| 2016-07 | +2.3% | Yes |
| 2016-12 | +2.1% | Yes |
| 2017-05 | +2.4% | Yes |
| 2017-10 | +2.6% | Yes |
| 2018-03 | +2.9% | Yes |
| 2018-08 | +3.1% | Yes |
| 2019-01 | +3.0% | Yes |
| 2019-06 | +2.7% | Yes |
| 2019-09 | +1.8% | No |
| 2020-02 | +1.4% | No |
| 2020-07 | +2.2% | Yes |
| 2021-01 | +2.5% | Yes |
| 2021-06 | +3.3% | Yes |
| 2022-01 | +3.6% | Yes |
Three Performance Zones
The model splits suburbs into three bins based on their Urban Heat score. Each bin shows a distinct growth pattern over four years.
54,228 sales tested
Statistically significant
173,422 sales tested
Near the market average
45,308 sales tested
Statistically significant
Geographic Breakdown
The signal works across most Australian regions. The chart below shows the spread (top quartile minus bottom quartile) for each GCCSA region. Positive spread means the signal works as expected.
Full Regional Table
All growth rates are annualised over 4 years.
| Region | Top Quartile | Bottom Quartile | Spread | N |
|---|---|---|---|---|
| Greater Darwin | -1.23% | -5.11% | +3.88% | 294 |
| Greater Melbourne | +1.29% | -2.21% | +3.50% | 5,440 |
| Rest of Vic. | +2.04% | -0.90% | +2.94% | 7,443 |
| Rest of NSW | +2.65% | +0.15% | +2.50% | 8,656 |
| Greater Brisbane | +2.12% | +0.58% | +1.54% | 6,416 |
| Greater Adelaide | +0.49% | -0.91% | +1.40% | 3,426 |
| Greater Perth | -2.45% | -3.49% | +1.04% | 3,948 |
| Greater Sydney | -0.13% | -1.07% | +0.94% | 5,286 |
| Rest of NT | -5.20% | -5.67% | +0.47% | 326 |
| Rest of Qld | +0.17% | -0.29% | +0.46% | 13,919 |
| Australian Capital Territory | +0.23% | +0.20% | +0.03% | 1,392 |
| Rest of WA | -2.50% | -2.36% | -0.14% | 5,721 |
| Rest of SA | -0.20% | +0.03% | -0.23% | 3,582 |
Suburb Comparisons
These tables show the highest-scoring and lowest-scoring suburbs in three major metro areas. Growth rates are annualised per year (2021-2025).
Greater Sydney
Top 10 Suburbs
| Suburb | Score | Growth (p.a.) |
|---|---|---|
| Denham Court | 100 | +1.60% |
| Cobbitty | 98.1 | -0.33% |
| Bullaburra | 97.7 | -0.79% |
| Glossodia | 97.2 | +0.94% |
| Wilberforce | 96.8 | +1.12% |
| Leppington | 96.3 | +2.07% |
| Bargo | 95.9 | +0.48% |
| Thirlmere | 95.4 | +0.71% |
| Glenmore Park | 94.8 | +1.33% |
| Kurrajong | 94.1 | +0.85% |
| Mean growth | +0.80% | |
Bottom 10 Suburbs
| Suburb | Score | Growth (p.a.) |
|---|---|---|
| Agnes Banks | 1 | -0.79% |
| Alison Central Coast | 5.8 | -1.21% |
| Bonnet Bay | 5.8 | -1.64% |
| Haymarket | 2.1 | -2.38% |
| Wolli Creek | 2.4 | -1.87% |
| Mascot | 3.1 | -1.52% |
| Zetland | 3.5 | -1.93% |
| Waterloo NSW | 4.2 | -2.11% |
| Rhodes | 4.6 | -1.74% |
| Wentworth Point | 4.9 | -2.06% |
| Mean growth | -1.73% | |
Greater Melbourne
Top 10 Suburbs
| Suburb | Score | Growth (p.a.) |
|---|---|---|
| Aintree | 99.9 | +3.41% |
| Cape Schanck | 99.7 | +2.86% |
| Cobblebank | 99.5 | +2.14% |
| Diggers Rest | 99.3 | +1.92% |
| Abbotsford Vic | 98.3 | -1.88% |
| Box Hill Vic | 98.3 | -2.22% |
| Brunswick East | 98.3 | -2.34% |
| Wallan | 98.8 | +1.47% |
| Officer | 98.5 | +1.68% |
| Clyde North | 98.1 | +2.03% |
| Mean growth | +0.91% | |
Bottom 10 Suburbs
| Suburb | Score | Growth (p.a.) |
|---|---|---|
| Cardinia | 0.8 | +0.22% |
| Big Pats Creek | 8.9 | -1.69% |
| Blind Bight | 8.9 | +1.42% |
| Southbank | 1.2 | -3.87% |
| Docklands | 1.5 | -4.14% |
| Melbourne CBD | 1.8 | -3.52% |
| South Yarra | 2.4 | -2.96% |
| St Kilda | 3.1 | -2.43% |
| Footscray | 4.7 | -1.88% |
| Box Hill Central | 5.2 | -2.31% |
| Mean growth | -2.12% | |
Greater Brisbane
Top 10 Suburbs
| Suburb | Score | Growth (p.a.) |
|---|---|---|
| Burpengary East | 100 | +1.15% |
| Augustine Heights | 98.9 | +1.04% |
| Bahrs Scrub | 98.9 | +2.74% |
| Jimboomba | 98.4 | +1.53% |
| Warner | 97.8 | +1.87% |
| Narangba | 97.2 | +1.62% |
| Caboolture South | 96.5 | +1.34% |
| Greenbank | 95.9 | +2.18% |
| Dakabin | 95.3 | +1.41% |
| Park Ridge | 94.7 | +1.96% |
| Mean growth | +1.68% | |
Bottom 10 Suburbs
| Suburb | Score | Growth (p.a.) |
|---|---|---|
| Albion Brisbane | 1.6 | -1.09% |
| Auchenflower | 1.6 | -1.24% |
| Cannon Hill | 1.6 | +0.91% |
| South Brisbane | 2.1 | -1.78% |
| Fortitude Valley | 2.3 | -2.14% |
| Woolloongabba | 2.8 | -0.87% |
| Newstead Qld | 3.4 | -1.43% |
| Kangaroo Point | 3.9 | -0.96% |
| Toowong | 5.2 | -0.63% |
| West End Qld | 5.7 | -0.52% |
| Mean growth | -0.78% | |
Is This Pattern Real?
We tested this rigorously. The chance of seeing +3.1% outperformance across 54,228 sales by random luck is effectively zero. Independent statistical tests confirm the result.
This is a real signal, not a crystal ball. Many factors drive property prices, from interest rates to local infrastructure to supply constraints. But across a decade of data, this pattern holds consistently.
The signal worked at 22 of 24 different time periods. It held in 8 of 13 geographic regions. The top quartile beat the bottom quartile in 91% of quarters. These are not the marks of a coincidence.
One important nuance: the signal is strongest in Melbourne and weakest in Sydney. Investors in the Sydney market should expect a smaller edge from this factor alone. Combining the Urban Heat Index with other Microburbs signals strengthens the result.
Want to Find Low-Density Suburbs With Strong Growth Potential?
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Suburb-Level Data for Serious Investors
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