When the City of Cockburn named its newest suburb after Joseph and Emma Treeby in September 2016, one of the couple’s own descendants told a local newspaper their ancestors “would’ve been embarrassed by the fuss.” The Treebys were unassuming market gardeners who arrived from South Australia in the 1890s hoping to plant apple orchards and ended up growing cauliflower and cabbage on 14 hectares instead. More than a century later, their name now covers 8.2 square kilometres of southern Perth and more than 4,200 residents, most of them living in brand-new estates the original family could never have imagined.
Suburb Boundary Map
Treeby sits within the City of Cockburn, about 23 kilometres south of the Perth CBD, on the eastern side of the Kwinana Freeway close to Cockburn Central. It’s bounded by the Jandakot Industrial Area, Dollier Street, Fraser Road and the City of Canning to the north, the City of Armadale to the east, Armadale Road to the south, and the suburb of Jandakot, Dollier Street and Solomon Road to the west. The map below traces the suburb’s official boundary.
Key Facts
| Local Government Area | City of Cockburn |
| Postcode | 6164 |
| Area | 8.2 square kilometres |
| Population (2021 Census) | 4,214 |
| Suburb Established | 16 September 2016 (split from Banjup) |
| Median House Price | Approximately $970,000 |
| Public Transport | Bus routes 233, 518, 523 and 529 connect to Cockburn Central and Armadale |
Sources: Australian Bureau of Statistics 2021 Census QuickStats, REIWA suburb data, Wikipedia, Transperth.
Who It Suits
Treeby suits families and first-home buyers wanting brand-new house-and-land packages in a fast-growing corridor with genuinely strong household incomes and easy Kwinana Freeway access. It’s a strong fit for buyers comfortable purchasing off-plan or in a still-developing estate, since large parts of the suburb are only a few years old. It’s a weaker fit for buyers wanting an established streetscape with mature trees and a long-settled community; Treeby’s residential character has almost entirely been built since 2016, and much of it is still under construction.
The Treebys: From Cauliflower Patch to Suburb Name
Long before it was a suburb, this land was part of Banjup, on country traditionally inhabited by the Beeliar Whadjuk of the Noongar people. Joseph and Emma Treeby arrived from South Australia in the 1890s with plans to establish apple orchards, but the local conditions steered them instead toward market gardening, and they built a successful operation growing mainly cauliflower and cabbage across more than 14 hectares. The family name stuck to the local area informally for generations, but it wasn’t until the City of Cockburn needed to carve a new suburb out of the northern part of Banjup, the portion extending north of Armadale Road, that Treeby became an official place name. The change was approved on 16 September 2016, making it one of the newest suburbs in the Perth metropolitan area at the time, following the same pattern of Banjup subdivision that had already produced Success and Atwell in 1973, and Hammond Park and Aubin Grove in the early 2000s.
The suburb’s rapid physical transformation has been just as dramatic as its naming. An area previously mined for sand became the site of Calleya, a large residential estate developed by Stockland with a prominent display village, terraces, townhomes and house-and-land packages; more than 1,100 packages have sold in Treeby to date. A second estate, Kara, developed by LWP Property Group, has since filled out the suburb’s western section. Treeby Primary School, the suburb’s only school, opened in 2022, catering from Kindergarten to Year 6 and serving intake areas across southern Treeby and neighbouring Jandakot.
Future Growth
Treeby is still very much under construction. Both Calleya and Kara continue to release new stages of house-and-land packages, and with more than 1,100 lots already sold at Calleya alone, the suburb’s population is likely to keep climbing well beyond its 2021 Census count for several more years yet. The December 2021 opening of the new bridge connecting Armadale Road to North Lake Road over the Kwinana Freeway has already eased congestion for the growing number of residents, and further local infrastructure, from parks to potential future schooling, is expected to follow the same pattern seen in neighbouring Aubin Grove and Hammond Park as those suburbs matured from raw estates into fully established communities.
Is It Worth Visiting?
Not really as a standalone destination. Treeby is a rapidly developing residential suburb without an attraction of its own, and it’s most relevant to people actively house-hunting in the Calleya or Kara estates rather than casual visitors. It’s worth knowing about if you’re comparing new-build options across Cockburn’s southern growth corridor, and the Calleya display village itself is worth a look if you’re weighing up several volume builders side by side.
Life in Treeby Day to Day
The 2021 Census recorded 4,214 residents in Treeby, with a median age of just 32, notably younger than the Western Australian median of 38 and consistent with a brand-new suburb filling in with young families. Family households made up an unusually high 81.6 percent of the total, well above the state average of 71.2 percent, and median weekly household income reached $2,479, among the highest recorded anywhere in the wider Cockburn district. Occupied private dwellings numbered 1,483, or 93.8 percent of all dwellings, and public transport use, at 11.7 percent of the journey to work, sits well above both the state and national averages. An average of two registered motor vehicles per dwelling further underlines just how car-dependent life remains for most residents, despite the relatively strong bus connections to Cockburn Central.
House Prices and What They Buy
REIWA’s most recent figures, updated 20 June 2026 for the twelve months to May, put Treeby’s median house price at approximately $970,000, up a strong 15.6 percent year-on-year, with median weekly rent around $850. Neighbouring Atwell posted 19.0 percent annual growth and Harrisdale 15.0 percent over the same period, suggesting the broader growth corridor Treeby sits within continues to see strong, sustained demand from buyers drawn to newer housing stock and freeway access.
Healthcare Nearby
Treeby has no medical centre of its own. Residents typically drive to Cockburn Central, Success or Jandakot for GP clinics and pharmacies, with Fiona Stanley Hospital a short drive north via the Kwinana Freeway for specialist and emergency care. As the suburb’s population continues to grow, additional local health services are likely to follow the retail and community infrastructure already taking shape around the Calleya and Kara estates.
Schools and Education
Treeby Primary School, which opened in 2022, is the suburb’s only school, catering for students from Kindergarten to Year 6 across an intake area covering southern Treeby and parts of neighbouring Jandakot. There is no secondary school within the suburb itself, and families typically look to nearby Cockburn or Armadale-area high schools for secondary education.
Jobs, Industry and Work Life
Treeby is almost entirely residential, with no significant local employment base of its own. Most working residents commute to Cockburn Central, Success, Jandakot Airport’s aviation precinct, or the Perth CBD, and the suburb’s relatively strong public transport usage reflects genuine investment in bus connections to Cockburn Central station despite the lack of a station within Treeby itself.
What You’ll Find Here
Calleya, Stockland’s large residential estate built on former sand-mining land, is Treeby’s most significant development, complete with a prominent display village and a wide range of housing types from terraces to house-and-land packages. Kara, a second major estate in the suburb’s western section, adds further new-build housing stock. Together these estates have transformed what was rural and semi-industrial land into one of the more active new-housing markets in the wider Cockburn district within less than a decade.
Parks, Greenspaces and Other Public Amenities
Formal public open space in Treeby is still developing alongside the suburb’s estates, with new parks integrated into the Calleya and Kara developments as construction progresses. Residents seeking more established parkland typically look to the Beeliar Regional Park network in neighbouring suburbs.
Getting There and Around
Treeby has no train station of its own; Cockburn Central and Aubin Grove, both on the Mandurah line, are the closest, located in neighbouring suburbs. Bus route 523 runs directly through the suburb via Armadale Road, Ghostgum Avenue, Clementine Boulevard and Sapphire Drive to Cockburn Central, while routes 233, 518 and 529 also serve Armadale Road, connecting to Gosnells, Murdoch TAFE and Armadale. The Kwinana Freeway runs along the suburb’s western edge, with interchanges at Armadale Road and Berrigan Drive giving drivers fast access both north to Perth and south to Rockingham, and a bridge over the freeway connecting Armadale Road to North Lake Road opened in December 2021.
The Honest Verdict
Treeby is a genuinely fast-growing suburb built almost entirely since 2016, offering new housing, strong household incomes and solid freeway access, but little in the way of established character or local amenity beyond its estates. It suits buyers actively seeking new-build stock in a growth corridor over those wanting a settled, mature neighbourhood. The Treeby family who gave the suburb its name might be surprised by the scale of what’s grown from their cauliflower patch, but the market gardening spirit of building something new from raw land, in a sense, lives on, and buyers weighing up Treeby against neighbouring Banjup, Jandakot or Hammond Park will find it a genuinely competitive option within the same broader growth corridor.
FAQ
Who was Treeby named after?
Treeby is named after Joseph and Emma Treeby, market gardeners who arrived from South Australia in the 1890s and grew cauliflower and cabbage on over 14 hectares in the area.
When did Treeby become its own suburb?
Treeby was formally established on 16 September 2016, split from the northern part of Banjup, the portion extending north of Armadale Road.
Is Treeby a good suburb to live in?
Yes, for buyers wanting new housing stock, strong household incomes and freeway access in a fast-growing corridor. It suits new-build buyers more than those wanting an established, long-settled neighbourhood.
References
- Australian Bureau of Statistics, 2021 Census QuickStats: Treeby
- Wikipedia, Treeby, Western Australia (research source)
- REIWA, Treeby Suburb Profile
- City of Cockburn, Official City of Cockburn Website
- Banjup Profile, perthinfo.net.au
- Hammond Park Profile, perthinfo.net.au
- Transperth, Bus Timetable 122 (Route 523)
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