Why a 1% Change in People Can Move House Prices: Lessons from Karratha, Port Macquarie and Byron Bay

Written by Christopher Hall, AdvDipFP | Authorised Representative, AFSL 526688 | June 2026

Internal migration equal to 1% of a local area's population is associated with roughly a 0.7–0.8% rise in house prices across Australia's three most populous states (Erol & Unal, 2021). That is a national average, and it understates what happens in supply-constrained markets — where a small change in who is arriving, or in how many people stay rather than leave, can move prices far more. Migration is only one driver, alongside interest rates, credit conditions, government stimulus and the pace of new construction. But because housing supply adjusts slowly, it is the change at the margin — against a near-fixed stock — that does much of the work.

That is also why a change described as "small" can matter. The 2026 SMSF residential-property borrowing ban was framed by the Government as affecting only around 1% of buyers (Australian Government, 2026). When supply cannot adjust quickly, a shift at the margin of demand — in either direction — can have an effect out of proportion to its headline size.

How does migration actually affect house prices?

Prices respond to the change in demand against a fixed stock, not to the total population. Because new housing takes years to build, a 1–3% change in net migration — or simply more people staying put than usually leave — can collide with a near-fixed number of homes and produce a much larger price response. The Australian Housing and Urban Research Institute notes that "internal migration determines the way in which housing price increases in one housing submarket increase housing prices in other submarkets," with regional cities and the suburban fringe playing an increasingly important role in national price patterns (AHURI, 2024).

The COVID period made the mechanism visible. In the year to December 2021, regional dwelling prices grew 25.9% against 21.0% in the capitals, after 6.9% versus 2.0% the year before — driven, on Housing Australia's account, by a large movement of people from cities to the regions and more people choosing to stay there (Housing Australia, 2022).

What happened in Karratha, Port Macquarie, the Sunshine Coast and Byron Bay?

Each of these markets shows a relatively small shift in demand producing an outsized local price response — in both directions. These are historical, location-specific episodes, not forecasts, and past movements are no guide to future prices.

Karratha is the clearest case of boom-bust elasticity. At the 2010–2014 resource peak, average weekly rents reached $2,200 and the median house price peaked at $955,000 (DevelopmentWA). The housing stock did not change; the workforce requirement did. As the resource cycle turned, prices fell hard — boom-town dynamics tied tightly to mining demand (Haslam McKenzie et al., 2009). The same resource-town pattern played out abroad in Fort McMurray, drawn out in what Canada's foreign-buyer bans and migration cuts did to house prices.

Port Macquarie-Hastings shows inflow combined with reduced outflow. Capital-to-region movement peaked after the pandemic, with movers from capitals to regions 7% higher in the March 2021 quarter than a year earlier, and capital-to-region movers making up 6.3% of all internal moves, up from 5.6% (Regional Movers Index, 2021). The NSW Valuer General recorded strong land-value growth driven by metropolitan relocation, noting "demand currently exceeds supply" (NSW Valuer General, 2021).

The Sunshine Coast absorbed net internal migration of 9,533 people between 2016 and 2021 — about 3.2% of its 2016 population (AHURI, 2024). Buyer competition surged: by late 2022 the number of potential buyers per listing on the Sunshine Coast and Gold Coast was roughly three times pre-pandemic levels (PropTrack, 2022).

Byron Bay and the wider Richmond-Tweed region show the same sensitivity in reverse. It was among the first regional markets to fall, recording the largest regional price decline from peak at that point, -6.3% (the area was also flood-affected), once interest rates rose and borrowing power declined (PropTrack, 2022). Byron did not need a large population surge — it needed a small number of high-income buyers competing for a limited number of tightly held homes.

Does migration always push prices up?

No. The same mechanism works in reverse, and migration is never the only force at work. The high-amenity markets that boomed on city buyers — Byron among them — were among the first to correct once interest rates rose and borrowing capacity tightened (PropTrack, 2022). The lesson is sensitivity at the margin, not a one-way bet: where stock is tightly held, prices can move sharply on a modest change in demand, up or down, and interest rates, credit and supply all shape the outcome alongside migration.

What does this mean for protecting wealth held in property?

For families whose wealth is concentrated in property, the practical takeaway is not to forecast the market — it is to make sure a forced sale is never triggered by something inside the household. Christopher Hall, AdvDipFP, Authorised Representative, AFSL 526688, has completed more than 500 life insurance policy reviews for Australian families. In his experience, clients approaching retirement with capital concentrated in one to three properties frequently underestimate the income-flexibility and liquidity risk this creates relative to a more diversified structure — a property cannot be partially sold, so adjustments require a full sale event, often with tax and timing consequences.

That illiquidity is exactly why protection matters more, not less, when so much wealth sits in property. If an owner dies or can no longer work, life, total and permanent disability (TPD), and income protection cover can supply the cash that prevents a property from being sold at the wrong time — independent of which way the market is moving. It is the same forced-sale risk that sits behind whether too much wealth is concentrated in property and the trustee questions raised by the 2026 SMSF residential-property borrowing ban, and it forms part of broader mortgage and property protection. Families in this position may wish to speak with a specialist life and income protection adviser about their individual circumstances.

Frequently Asked Questions

How does migration affect house prices in Australia?

Migration affects prices through the change in demand against a slow-moving housing supply. Because new homes take years to build, even a 1–3% change in net migration — or more people staying rather than leaving — can move prices, and the effect is larger where stock is constrained. Internal migration equal to 1% of a local population is associated with about a 0.7–0.8% price rise across the three most populous states on average (Erol & Unal, 2021).

Does a 1% increase in population raise house prices by 1%?

Not exactly. Research by Erol and Unal (2021) associates internal migration equal to 1% of a local area's population with roughly a 0.7–0.8% rise in house prices in the three most populous states. That is an average — in supply-constrained coastal and mining markets the response can be considerably larger, while in a large, well-supplied city it can be smaller.

Why do regional and coastal house prices move more than capital cities?

Regional and coastal markets often have tightly held stock and limited new supply, so a modest change in demand meets a near-fixed number of homes. In the year to December 2021, regional dwelling prices rose 25.9% against 21.0% in the capitals (Housing Australia, 2022). The same constraint means these markets can also fall faster when demand eases.

What caused Byron Bay house prices to fall?

Richmond-Tweed, which includes Byron Bay, recorded the largest regional price fall from peak at that point, -6.3% (the area was also flood-affected), once interest rates rose and borrowing power declined (PropTrack, 2022). High-amenity markets that had boomed on city buyers were among the first to correct — the same sensitivity that drove prices up worked in reverse.

Why did Karratha house prices boom and then bust?

Karratha's housing tracked the resource cycle. At the 2010–2014 peak, average weekly rents reached $2,200 and the median house price reached $955,000 (DevelopmentWA). The housing stock did not change — the workforce requirement did — so when mining demand eased, prices fell sharply (Haslam McKenzie et al., 2009).

Is migration the main reason Australian house prices rise?

No. Migration is one driver among several, including interest rates, credit availability, government stimulus and the pace of new supply. Its influence is largest at the margin, where a change in demand meets a fixed stock — but it never operates alone, and attributing price movements to a single cause overstates its role.

How can wealth tied up in property be protected against a forced sale?

Property is illiquid and cannot be partially sold, so a sudden need for cash — for example after an owner's death or disability — can force a sale at an inopportune time. Life, TPD and income protection cover can supply that cash instead. A review of existing cover against current circumstances is the usual starting point; individual situations vary, and a qualified adviser can confirm what applies.

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Book a quick review with an adviser now. For families whose wealth is concentrated in property, a professional life insurance review checks whether existing life, income protection and TPD cover is enough to prevent a forced sale if an owner dies or can no longer work — whatever the market is doing.

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About the Author

Christopher Hall, AdvDipFP, is the principal financial adviser at Arrow Equities and an Authorised Representative under AFSL 526688. He has completed more than 500 life insurance policy reviews for Australian families, with a specialisation in life risk insurance.

Bibliography

#	Source	Type	Date
1	Erol, I & Unal, U — Internal Migration and House Prices in Australia (internal migration of 1% of local population ≈ 0.7–0.8% house-price rise, three most populous states)	Tier 1 — academic	2021
2	AHURI — House price dynamics and internal migration across Australia, Final Report No. 421 (submarket spillover; Sunshine Coast net migration 9,533 / 3.2%)	Tier 1 — institutional research	2024
3	Housing Australia — State of the Nation's Housing 2021–22 (regional +25.9% vs capitals +21.0%, yr to Dec 2021)	Tier 1 — institutional	2022
4	Commonwealth Bank of Australia & Regional Australia Institute — Regional Movers Index (capital-to-region movers 6.3% of internal moves, up from 5.6%)	Tier 2 — industry data	2021
5	NSW Valuer General — Port Macquarie-Hastings LGA land values ("demand currently exceeds supply")	Tier 1 — government	2021
6	DevelopmentWA — Karratha case study (peak weekly rent $2,200; median house $955,000)	Company / government disclosure	n.d.
7	Haslam McKenzie et al. — Housing market dynamics in resource boom towns, AHURI Positioning Paper No. 105	Tier 1 — academic	2009
8	PropTrack (REA Group) — Regional Australia Report 2022 (buyers-per-listing surge; Richmond-Tweed -6.3% from peak)	Tier 2 — industry	2022
9	Australian Government — SMSF residential-property borrowing measure (characterisation of buyers affected, ~1%)	Tier 1 — government	2026
10	Christopher Hall, Arrow Equities — proprietary observations from 500+ life insurance policy reviews	CH practitioner	2026

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