The marriage & divorce slide
And what it really means for housing demand
Synopsis
Australia’s marriage and divorce rates are both falling, and people are partnering later than ever. This delays household formation, lengthens the rental phase, reduces demand for larger dwellings, and shifts family-home buying into the late 30s and 40s. It’s a quiet demographic shift with big housing implications.
Introduction
For decades, Australia’s housing market has been powered by a dependable demographic conveyor belt. People pair up, get married, start families, need more space, trade up, and eventually downsize. That tidy progression created suburbs, justified infrastructure, and underwrote a century of housing supply assumptions.
But the engine room of household formation is changing - quietly, steadily, and in ways that matter enormously for future demand.
Two slow-burn trends now shape the market more than we acknowledge: marriage rates are falling, and divorce rates are falling too. Add in the steady drift upward in the age people marry, and you get a powerful demographic undertow pulling against family-home demand.
Let’s unpack the latest ABS data and what it means for Australia’s housing future.
Listen: to my two minute summary.
1. Marriage rates are in long-term decline
In 2004, Australia recorded around 7 marriages per 1,000 people. Today that rate sits just above 5, even after the post-pandemic rebound. In raw numbers, marriages have slipped from 115,000–120,000 per year down to around 105,000.
Marriage hasn’t disappeared - but it has lost its universality. And critically, it has shifted later.
In 2004, 49% of marriages were among people under 30. By 2024, it’s just 36%.
The age breakdown has changed dramatically:
Under 24: 18% → 9%
25–29: 31% → 27%
30–34: 22% → 27%
35–39: 11% → 13%
40–49: steady at 11–12%
50+: 7% → 10%
This is one of the most important - and under-reported - social shifts in Australia.
We are no longer a country that partners and settles early.
Why does this matter for housing?
Because union formation is one of the strongest drivers of new household formation. When fewer people marry, and those who do marry wait longer to do it, the demand for family-sized dwellings doesn’t just soften - it shifts a decade later.
A couple marrying at 25 typically buys their first home in their late 20s. A couple marrying at 34 buys at 36–40.
That is a huge shift in the timing of demand. It stretches the rental phase, extends apartment-living years, and delays entry into the suburban family-home market. Developers feel it. Agents feel it. First-home buyer numbers reflect it.
2. Divorce rates are falling too
In 2004, the crude divorce rate was around 3.5 divorces per 1,000 people. By 2024 it’s around 2, with the only anomaly being the 2021 administrative backlog spike.
Many interpret this decline as a sign of stronger marriages. But combine it with falling marriage rates and another explanation becomes clear: You can’t get divorced if you never married.
De facto partnerships now dominate early-adult relationships. They form and dissolve regularly, but they don’t appear in divorce statistics. So while the ABS shows fewer divorces, relationship churn hasn’t reduced at all - it has just moved off the books.
For housing demand, this matters because divorce has historically created two households from one. Separation spikes demand for smaller homes, rentals, and entry-level stock. With fewer legal divorces, fewer formal splits are recorded - reducing one source of household creation.
Lower marriages + lower divorces = fewer household starts and fewer household splits.
That combination reduces total new household formation, slowing demand growth.
3. The impact
Taken together, these shifts change the structure of housing demand in three major ways:
Smaller household sizes become permanent. If people partner later, cohabit less formally, or remain single longer, one-person and two-person households dominate. That reduces long-term demand for larger detached dwellings.
The rental phase lengthens. Young Australians remain renters longer - not only due to affordability, but due to life cycle delays. More renters = more pressure on the rental market, even while demand for first-home purchases cools.
Demand for family housing shifts later - and may shrink in absolute terms. The mid-30s marriage peak is now tied to a cohort smaller than the Millennial bulge. So the future pool of family-home buyers is not just delayed - it is numerically smaller.
This puts structural downward pressure on greenfield demand, even if migration temporarily props it up.
4. The future
These demographic shifts aren’t dramatic or shocking. They don’t move markets overnight. But they accumulate - year after year - until they reshape the system.
Five consequences stand out:
1. Smaller, smarter dwellings will see stronger demand. Not micro-apartments, but well-designed 1- and 2-bedroom stock.
2. Rentals will remain under pressure. More singles, more late-30s renters, fewer early upgraders.
3. Detached homes will rely increasingly on migrants and second-generation families.
4. Housing turnover will continue to fall. Fewer marriages + fewer divorces = fewer “life events” triggering moves.
5. The family-home market will keep shifting older. Instead of buying at 28–32, buyers arrive at 35–45.
This is already visible in buyer profiles across the country and especially in the capitals. And it helps explain why some markets boom despite falling local household formation - migration is now doing the heavy lifting. And what happens to these markets when migration goes back to the longer term trend is the topic of our next missive.
5. The takeaway
Australia’s population is still growing strongly, but its households are not forming at the same pace. Marriage and divorce trends are slow-moving but powerful, and they are quietly reshaping the housing landscape.
The Australian Dream isn’t dead - it’s just delayed.
And that delay changes everything from dwelling supply pipelines to rental market stress to the pace of suburban expansion.