The former oil refinery at Lonsdale now has a planning pathway and a name. It also has a construction start that is still two years away, a remediation program in front of it, and two commitments that read differently to the way they read in 2024.
South Australia has approved the rezoning of the former Port Stanvac oil refinery site at Lonsdale, clearing the planning pathway for 3,600 homes, a mixed use town centre and more than 60 hectares of employment land on Adelaide’s southern coast. The new community will be called South Beach.
The Department for Housing and Urban Development confirmed the decision on 27 July 2026. Developer MAB will deliver the project across 230 hectares, roughly 23 kilometres south of the Adelaide CBD.
For builders, the headline number is not the interesting part. Rezonings get announced constantly. What matters is when the work becomes real, what kind of work it is, and what still has to happen before any of it starts.
On that front, this one has a longer runway than most, and a specific gate that most greenfield sites do not have.
What the approval actually delivers
The Port Stanvac Mixed Use Code Amendment rezones most of the site from Strategic Employment to a combination of Master Planned Neighbourhood, Conservation and Urban Neighbourhood zones. A Concept Plan sits underneath it, setting the framework for building heights, activity centre locations, transport connections, open space, stormwater management and traffic measures.
That is the part worth reading properly. Zoning sets what is possible on a site. The Concept Plan sets where and how.
The housing mix is broad. Detached houses, townhouses and apartments, accommodating close to 8,000 residents once complete. More than 31 per cent of the site is retained as open space, including a 40 hectare coastal reserve that opens 1.7 kilometres of beach to the public for the first time in generations and closes a missing link in the 70 kilometre coastal trail running between North Haven and Sellicks Beach.
The state government expects the completed development to add $509 million a year to the Onkaparinga economy and support almost 1,700 jobs.
Access is genuinely strong. The site sits alongside Lonsdale Railway Station and the Southern Expressway. The approval also covers upgrades to state and local road intersections, and a new rail overpass connecting Sheriffs Road into the development.
Two numbers have moved since 2024
When the state government first announced the Port Stanvac agreement in November 2024, the precinct was described as delivering approximately 3,600 dwellings including a minimum of 15 per cent affordable housing.
The July 2026 approval describes it differently. It states that up to 15 per cent of the 3,600 homes will be affordable housing.
A minimum and a maximum are not the same commitment.
Whether that reflects a policy change, a drafting change, or simply the shift from an in principle agreement to an approved planning instrument is not explained in the approval. But builders and community housing providers pricing affordable product on this site should read 15 per cent as a ceiling rather than a floor until the point is clarified.
The delivery timeline has moved too. The 2024 announcement said MAB anticipated first residents moving in during 2028. The 2026 approval says construction is anticipated to commence in 2028, with first residents arriving in 2029. MAB’s own project material now describes a 2028 launch and 2029 arrivals.
A twelve month shift on a project of this size and complexity is not remarkable. It is worth noting anyway, because it is the kind of movement that compounds. Anyone building a resourcing plan around a 2028 start should build it with room to move.
Remediation is the real gate
Port Stanvac refined crude oil from 1963 until ExxonMobil ceased operations in 2003. The site is known to be contaminated, and the approval is explicit that remediation will be required as part of any redevelopment, overseen by independent qualified environmental consultants.
That is the sequencing that matters. Zoning is approved. Remediation is not complete. Until it is, residential work does not start.
South Australia has done this kind of work before. The state government described the Brompton Gasworks remediation as one of the most complex soil remediation projects in the state’s history, and that site is a fraction of Port Stanvac’s footprint.
The practical read is straightforward. Treat remediation milestones, not the rezoning, as your planning trigger.
How long a rezoning like this actually takes
The Proposal to Initiate the Port Stanvac Mixed Use Code Amendment was approved on 9 May 2025. The determination landed on 27 July 2026.
That is roughly fourteen months from initiation to approval for a 230 hectare, third party code amendment on a contaminated coastal site with significant interface, traffic and environmental issues. If you are weighing whether to pursue a rezoning of your own in South Australia, that is a realistic clock on a complex one, before a single development application is lodged.
Where the work actually sits
Three distinct pools of work come out of a project like this, and they arrive at different times.
• Civil and remediation first. Earthworks, contamination management, services, roads, the Sheriffs Road overpass and intersection upgrades. This is where the early money is, and it is not residential builder work.
• Residential delivery second. 3,600 dwellings across detached, townhouse and apartment typologies is a wide brief. It suits volume builders on the land component and specialist apartment and townhouse builders on the denser precincts near the station and town centre.
• Commercial and employment third. More than 60 hectares zoned for service industries, manufacturing, innovation and technology, plus the retail and town centre component.
For scale, South Australia completed 13,514 homes in 2025, which the state government reported as a record year. South Beach at 3,600 homes represents a little over three months of state wide output, spread across a decade or more of delivery. It is significant. It is also a pipeline, not a surge.
What to watch from here
Three things will tell you more than any further announcement.
• The published Code. The zoning provisions and Concept Plan set the actual height, density and land use rules. Read the version that lands in the Planning and Design Code, not the consultation fact sheets.
• Remediation milestones. These control the start date more than anything in the planning approval does.
• Land release and builder appointments. This is the mechanism through which builder opportunities will surface, and it is where the first real commercial signals will appear.
The bottom line
The rezoning is real, and the site is genuinely one of the last significant coastal infill opportunities left in metropolitan Adelaide. That part is not marketing.
But the same approval confirms a 2028 construction start sitting behind a remediation program of unknown duration, and it uses different language on affordable housing than the announcement that started all of this in 2024.
Both things can be true at once. A good project and a long road are not a contradiction.
THE GOOD BUILDER TAKE
Rezonings are easy to over read. The approval at Port Stanvac is a genuine milestone, but it is a planning milestone, not a construction one.
The useful discipline here is the one that applies to every long dated project. Work out what the actual gate is, then track that instead of the announcements. On this site the gate is remediation, and nobody has published a date for it.
Keep it on your radar. Do not build a 2028 forecast around it yet.
Frequently asked questions
No. The rezoning was approved on 27 July 2026. Construction is anticipated to commence in 2028, with the first residents expected to arrive in 2029. Site remediation must be carried out before redevelopment proceeds.
3,600 homes, made up of a mix of detached houses, townhouses and apartments, accommodating close to 8,000 residents once the development is complete.
Yes. The site operated as an oil refinery from 1963 until ExxonMobil ceased operations in 2003. The approval confirms the land is known to be contaminated and that remediation will be required as part of any redevelopment, overseen by independent qualified environmental consultants.
The July 2026 approval states that up to 15 per cent of the 3,600 homes will be affordable housing. The original November 2024 announcement described the precinct as including a minimum of 15 per cent affordable housing.
At Lonsdale, roughly 23 kilometres south of the Adelaide CBD, within the City of Onkaparinga. The site sits alongside Lonsdale Railway Station and the Southern Expressway.
Australian developer MAB, which entered a contract of sale with site owner ExxonMobil. MAB will work with the State Government and the City of Onkaparinga on remediation and implementation of the Code Amendment.
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• South Australia’s Housing Pipeline Accelerates as Building Approvals Surge
• Defence Sites Flagged for Potential Urban Renewal Across Adelaide
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This article is intended for general information purposes only and does not constitute legal, financial, or professional advice. Laws, regulations, and industry requirements vary by state and territory and change over time. Builders and trades professionals should seek independent advice relevant to their specific circumstances before making business, legal, or financial decisions.
Last updated: July 2026.
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