Sydney is entering a new era of urban development. For decades, growth and opportunity have been concentrated around the Sydney CBD and Parramatta, leaving Western Sydney historically underserved. That balance is changing. Over the next decade, billions of dollars in coordinated infrastructure investment will reshape how Sydney grows, works, and connects.
At the centre of this transformation is the Metropolis of Three Cities vision, a state-led strategy designed to create more balanced access to jobs, housing, and services. Within this framework, the Western Parkland City, the Western Sydney Aerotropolis, and the South West Growth Area are emerging as the most dynamic and ambitious components of Sydney’s future growth story.
Together they represent a generational shift in how Sydney integrates planning, infrastructure, and investment, turning the west into a fully connected and self-sustaining part of the greater city.
A Metropolis of Three Cities

The Metropolis of Three Cities plan, led by the Greater Sydney Commission, outlines an integrated vision for Sydney’s long-term growth. It divides the region into three complementary metropolitan areas, each designed to function as a complete city with jobs, housing, education, and transport within a 30-minute reach.
- The Eastern Harbour City, anchored by the Sydney CBD, remains the financial and cultural core.
- The Central River City, centred on Parramatta, serves as Sydney’s administrative and educational hub.
- The Western Parkland City, surrounding the new Western Sydney International Airport, is planned as the growth frontier for innovation, logistics, and future population.
The plan aims to rebalance opportunity, reduce daily commute times, and create a more equitable distribution of services across the metropolitan area. Western Parkland City will experience the most rapid expansion, with its population expected to grow from around 740,000 in 2016 to more than 1.1 million by 2036.
Supporting this growth are major infrastructure projects such as the new Western Sydney International Airport, the Western Sydney Aerotropolis, and the South West Growth Area. Together they form the foundation of a new economic geography for New South Wales.
Western Sydney Aerotropolis: The Beating Heart of the West

With major construction works now complete and set to open in 2026, the $5.3 billion Western Sydney International (Nancy-Bird Walton) Airport will anchor one of the most significant city-building projects in Australia’s history, known as the Western Sydney Aerotropolis. Envisioned as the beating heart of the Western Parkland City, this 11,000-hectare precinct will reshape Sydney’s western economy and create a global gateway for trade, innovation, and advanced industry.
Within five years of opening, the airport is expected to generate 28,000 direct and indirect jobs, growing to nearly 48,000 by 2041 as operations expand and new industries take root. Surrounding the airport, the Aerotropolis is being planned as a high-technology employment centre, focusing on:
- Advanced manufacturing and aerospace
- Freight, logistics and distribution
- Agribusiness and food exports
- Research, education and training
At the core of this development is the Bradfield City Centre, supported by $1 billion in NSW Government funding. It will feature commercial, industrial and civic spaces designed to accommodate more than 20,000 jobs and 10,000 residents, with state-of-the-art digital and energy infrastructure.
The Aerotropolis has been designed to integrate work, housing and transport. Direct links via the new M12 Motorway and the Sydney Metro – Western Sydney Airport line will connect the precinct to the rest of the city, offering a 15-minute metro journey from St Marys to the airport terminal and an efficient road connection to the M7 and Parramatta. These links make the Aerotropolis the key connection between the existing metropolitan area and the emerging Western Parkland City.
Supported by more than $25 billion in public infrastructure investment, including roads, utilities and transport, the Aerotropolis is also expected to attract substantial private investment over the next two decades. Together, these projects support the “30-minute city” goal, where residents can live, work and study within half an hour of home, creating a more balanced and accessible Sydney.
In essence, the Western Sydney Aerotropolis represents a long-term transformation of Western Sydney’s economy. It will create new opportunities for business, education and employment while establishing a modern, globally connected city that supports both growth and liveability.
Austral and the South West Growth Area

Immediately east of the Aerotropolis lies the South West Growth Area (SWGA), one of Sydney’s most important housing corridors. Spanning more than 10,000 hectares across suburbs such as Austral, Leppington, Oran Park and Catherine Field, the precinct has been designed to accommodate over 105,000 new homes by 2041 and provide a mix of town centres, schools and open spaces.
The South West Growth Area’s rapid evolution began with large-scale rezoning in 2013, opening the door for new master-planned communities. Since then, successive infrastructure projects including the Leppington train line, upgrades to Bringelly Road and Camden Valley Way, and the future Fifteenth Avenue Smart Transit corridor have accelerated development and strengthened links to the Aerotropolis and Liverpool.
Austral, once a semi-rural suburb of small acreages and farms, is now one of Sydney’s fastest-growing communities. Between 2016 and 2021, its population rose by 126 percent, driven by new estates, affordable land and proximity to the airport precinct. According to CoreLogic, house prices in Austral increased by around 27 percent in 2023, with the median value approaching $1 million. Yields remain healthy at approximately 3.6 percent, and the area continues to attract both first-home buyers and investors seeking long-term capital growth.
Several factors underpin this momentum:
- Transport connectivity through the M12 Motorway and upgraded arterial roads
- The ongoing expansion of Leppington Station and future metro links
- Proximity to employment in the Aerotropolis and Western Sydney Employment Area
- Continued population growth and limited supply of serviced land
The NSW Department of Planning’s updated Structure Plan for the SWGA emphasises balanced development, combining housing with local employment, schools, health services and green space. As more infrastructure is delivered, Austral’s identity is shifting from fringe suburb to established residential hub within the Western Parkland City.
Western Sydney is the centrepiece of Sydney’s next phase of growth. The Metropolis of Three Cities plan has created a clear framework for balanced development, with the Western Parkland City as its most ambitious chapter.
The Western Sydney Aerotropolis will anchor this new city with a 24-hour international airport, new rail and motorway links, and more than $25 billion in supporting infrastructure. The surrounding South West Growth Area, including Austral, is rapidly urbanising, driven by population growth, new housing supply and strong investor interest.
Together, these projects represent a generational investment in connectivity, employment and liveability. Over the coming decade, Western Sydney will evolve from an outer-suburban landscape into a globally connected and economically diverse region, shaping the future of Sydney’s growth and prosperity.

















