Over the past decade, Western Australia has transitioned from a market viewed primarily through a mining cycle lens to one supported by population growth, economic diversification and long duration public and private investment. These structural changes are now evident in housing demand across both metropolitan Perth and key regional markets, particularly along the southern corridor through to Busselton and Margaret River.
For Ark, this shift underpins the allocation of residential development capital into Western Australia, focused on greenfield land subdivision and low to mid-rise built form.
Population growth within a more stable economic base
Western Australia recorded population growth of 2.2% in the year to 30 June 2025, the highest of any Australian state, according to the Australian Bureau of Statistics. Net interstate migration accounted for more than 40% of this growth, reversing a decade long trend of eastward outflows.
What differentiates this cycle from prior periods is the composition of employment growth. While resources remain important, they are no longer dominant in driving population outcomes. Health care, education, defence, logistics and professional services now represent a materially larger share of employment growth than during previous mining led expansions.
ABS labour force data indicates mining now accounts for approximately 10% of WA employment, compared with more than 15% at the peak of the last cycle. Health care and social assistance alone now employ more people in WA than mining.
For residential markets, this breadth matters. A diversified employment base reduces volatility, supports sustained household formation and underpins demand across cycles.
Defence investment as a long duration demand driver
Defence spending represents a structural change for Western Australia rather than a cyclical overlay.
Under the AUKUS framework, Australia has committed approximately $368 billion to defence capability investment over coming decades. Western Australia is a central beneficiary of this program. HMAS Stirling in Rockingham is being developed as the primary hub for Australia’s future nuclear powered submarine fleet.
The Department of Defence has confirmed more than $8 billion of defence related infrastructure investment in Western Australia over the next decade, including base upgrades, sustainment facilities, workforce accommodation and supporting supply chain infrastructure.
Unlike construction led stimulus, defence investment generates permanent employment. Defence personnel, engineers, technicians, contractors and professional services firms support durable household formation, particularly across Perth’s southern corridor and adjacent regions.
Housing demand continues to exceed delivery capacity
Housing supply has improved but remains insufficient relative to demand.
The WA Government reported 22,602 dwelling completions in 2024 to 2025, the highest annual total in eight years. Even at this level, completions remain below implied household formation driven by population growth.
Rental market data reflects this imbalance. REIWA reported a Perth rental vacancy rate of 2.6% in December 2025. Regional markets remain materially tighter, with Bunbury at 0.4% and Busselton below 1%.
Construction capacity remains a binding constraint. Research drawing on ABS data indicates average residential build times in Western Australia have increased by more than 70% since 2020. This materially delays supply response even where approvals and commencements improve.
Greenfield subdivision and built form both required
Greenfield subdivision remains essential to meeting demand, particularly for family formation. Feasibility is increasingly dependent on infrastructure sequencing, civil cost control and realistic staging.
Low to mid-rise built form is also becoming necessary. Detached housing alone cannot absorb current population growth without significant affordability impacts. Townhouses and apartments in appropriate locations are required to supplement supply, particularly near employment nodes, education precincts and transport corridors.
In this segment, risk is driven by execution rather than demand. Planning pathways, construction sequencing and cost discipline determine outcomes.
The southern corridor reflects structural growth
The corridor from Perth through Rockingham, Mandurah, Bunbury and Busselton has transitioned from lifestyle driven demand to structurally supported population growth.
State planning forecasts indicate population growth of approximately 2.4% per annum for the City of Busselton over the next decade. Planning documentation translates this into demand for approximately 400 new dwellings per year, based on household size assumptions.
This growth is supported by health care expansion, education, tourism, agribusiness and improved connectivity to Perth. These drivers are persistent rather than cyclical.
Capital allocation framework
Ark’s residential investment strategy in Western Australia is grounded in delivery risk management rather than thematic exposure. Capital is allocated to projects with credible planning pathways, demonstrable demand and staging aligned to absorption.
Cost and programme assumptions are underwritten conservatively, reflecting current construction capacity and build time realities. Preference is given to locations where demand is supported by employment diversity and infrastructure investment rather than reliance on a single industry.
Western Australia is now operating with a broader economic base, sustained population inflows and long duration public investment. Housing supply remains constrained by planning, servicing and construction capacity. That imbalance is structural rather than temporary.
For residential development capital, this creates a clear allocation case where execution discipline, rather than market timing, is the primary determinant of outcomes.
Article written by Zak Fennell, Head of Investments
The commentary in this article in no way constitutes a solicitation of business or product advice. It is expressed solely as the opinion of the author, and as general information for the reader. It is not information to be relied upon in making investment decisions.
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