Here’s a sentence that makes most first-time investors nervous: over any 20-year period, a typical house in almost any suburb — metro or regional, in any state — will actually lose value in 5 to 9 of those years. Some of those drops aren’t gentle either. Values have fallen 10%, 15%, even more than 20% in a single year, in markets all over the country.

And yet, zoom out to the full 20-year picture, and those same markets still average around 7% annual capital growth.

That’s not a contradiction. It’s how property actually works — and understanding it is the difference between an investor who panics and sells at the wrong moment, and one who holds through the cycle and comes out ahead.

What 20 Years of Real Data Actually Shows

Looking at price history across eight suburbs spanning Western Australia, South Australia, Queensland and Victoria from 2005 to 2024, the pattern is remarkably consistent — and remarkably uncomfortable if you’re only looking one year at a time.

• Geraldton, WA dropped -24.5% in 2017, on top of a further -12.0% the year before that. It still averaged 7.13%annual growth across the full 20 years.
• Whyalla Jenkins, SA fell -22.7% in 2017 and -12.0% in 2015. Its 20-year average: 7.26%.
• Port Augusta, SA posted back-to-back double-digit falls in 2012 (-12.2%) and 2014 (-16.8%). Its 20-year average was the highest on the list, at 8.08%.
• Rockhampton, QLD dropped -15.1% in 2016 and -11.5% in 2020, yet still returned 7.34% on average.
• Davoren Park, SA had its own rough patches through 2011–2016, and still landed at 8.05% average growth.

Every single suburb in this dataset went backwards multiple times — most between 5 and 9 negative years out of 20 — and every single one still delivered an average annual return around or above 7%.

Why the Bad Years Don’t Cancel Out the Good Ones

This is the part that trips people up. It feels intuitive that a -20% year should require a matching +20% year just to break even, and that a market swinging that hard must be “risky.” But capital growth doesn’t work on simple arithmetic — it compounds, and the big up-years tend to be genuinely enormous.

Albany, WA is the clearest example: it fell in nine of the last twenty years, including a run of consecutive declines through 2007–2009. But 2006 alone delivered 66.3% growth. That single extraordinary year, layered on top of ordinary and negative years alike, is what pulled Albany’s 20-year average up to 7.06% despite nearly half its years being negative.

This is true across almost every market examined: a handful of outsized growth years — often 20%, 30%, even 40%+ in a single year — do the heavy lifting, while the down years are simply the cost of staying invested long enough to be there when they happen.

The Real Lesson for Investors

If you buy a property and it’s worth less than you paid twelve months later, that’s not a sign the market has failed you. Based on 20 years of data across markets in four different states, it’s the expected, normal texture of property ownership — not the exception.

The investors who build real wealth aren’t the ones who found a market that never goes down. That market doesn’t exist. They’re the ones who understood, before they bought, that 5 to 7 down years over two decades is simply part of the deal — and who had the holding power and the right entry point to still be in the market when the big growth years arrived.

What This Means for Your Next Purchase

Short-term thinking is the enemy of good property investment. If your investment horizon is 12 or 24 months, this data isn’t for you — you’re exposed to exactly the volatility described above, with no time to let the averages play out.

But if you’re thinking in decades, the question changes. It’s no longer “will this suburb ever go down.” It will. The real questions are: does this market have the underlying economic drivers to produce those outsized growth years over time, and can you hold through the down years without being forced to sell at the wrong moment?

That’s a fundamentally different — and far more useful — way to evaluate where to buy.

Want a data-backed read on how a specific market’s growth pattern and volatility stack up against your investment timeline? That’s exactly the kind of analysis an independent buyer’s agent — with no developer or vendor ties — should be doing for you.