FROM TUNNEL
TO TOWN.
How Adelaide's $21.7 billion T2D project is reshaping land development, unlocking housing supply, and driving the next property cycle.
10.5km
Combined tunnel & motorway
40 min
Peak travel time saved
50,000+
New homes in SA pipeline
8%+
Annual price growth
The T2D Project
The River Torrens to Darlington (T2D) Project is constructing two separate tunnels, the Southern Tunnels (~4km) and the Northern Tunnels (~2.2km), connected by an open motorway (~2.5km). Together they'll create 78km of non-stop, traffic-light-free motorway between Gawler and Old Noarlunga, bypassing 21 sets of traffic lights.
Construction Timeline
River Torrens to Darlington, 2024 through 2031
Southern Tunnels
Running from the open motorway at Darlington to south of Anzac Highway in Glandore. ~4km of twin three-lane tunnels providing key connectivity to Anzac Highway. TBM works commence second half of 2026.
Northern Tunnels
Running from James Congdon Drive to the existing open motorway south of Grange Road. ~2.2km of twin three-lane tunnels. The open motorway connects key routes including Richmond Road and James Congdon Drive.
$850M in Network Upgrades
Beyond the tunnels, $850 million worth of additional network and amenity upgrades include road resurfacing, shared-use cycling paths, vegetation, lighting, and undergrounding of power lines — creating connected communities and improving land use opportunities.
Where the Soil Goes, New Communities Rise
The SA Government is creating 50,000+ new homes statewide, an increase of 10,000 above previous expectations, as part of the A Better Housing Future plan. Millions of tonnes of excavated tunnel spoil from the T2D project are being repurposed to level and prepare these new land release sites.
Where the Tunnel Soil Goes
Estimated distribution of millions of tonnes excavated from 10.5km of twin tunnels
Spoil Destination Map
Interactive map, hover over markers to explore each destination
SA Government Land Releases
Planned new homes by development site, Dept. Housing & Urban Development
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New Homes
0+
South Australians
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Major Sites
The Soil Connection
Key land release sites like Dry Creek (15,000 homes) and Concordia (12,000 homes) are receiving T2D tunnel spoil to level terrain and prepare building pads. This dual-purpose approach reduces construction waste while accelerating the land development pipeline, a direct link between infrastructure investment and housing supply.
The Market Numbers
Adelaide's property market is running hot, driven by record population growth, critically low vacancy rates, and a supply pipeline that can't keep pace.
Adelaide Property Market Trajectory
Median house price ($K) and weekly rent ($), Greater Adelaide
$0K
Median House 2025
$0/wk
Median Rent 2025
The Supply–Demand Gap
SA annual population growth (K) vs dwelling approvals (K), the widening chasm
0:1
Demand vs Supply Ratio
0K
Population Growth 2025
Since 2022, population growth has outpaced dwelling approvals by nearly 3:1
Adelaide Rental Vacancy Rate
% of total rental stock, a healthy market requires 3%+
0%
Current Vacancy
Rental Growth: Adelaide vs National
Annual % change in median weekly rent
0%
Adelaide 2025
0%
National 2025
Median House Prices Along the T2D Corridor
Median sale prices by suburb cluster ($K), showing consistent year-on-year growth
Median house prices across all T2D corridor suburbs have continued to rise year on year. Suburbs closest to the tunnel alignment, such as Darlington, Glandore, and the Inner South, are recording the strongest gains as the market prices in the long-term infrastructure uplift.
Now that the tunnel route is confirmed and construction timelines are set, buyer confidence is returning. History consistently shows that once major infrastructure projects move from planning to delivery, surrounding property values accelerate, making the current window a strategic buying opportunity before the next wave of growth.
"Infrastructure creates corridors. Corridors create communities. Communities create value."
Tony Lawson, eXp Australia
What This Means for Agents
Property Price Growth — Adelaide's Position
Adelaide has been one of Australia's strongest performing capital city markets, recording over 8% annual growth through 2024–2025. Median house prices have surged past $800,000, up from under $500,000 just five years ago. Unlike Sydney and Melbourne, Adelaide has not experienced a correction phase, demand continues to outstrip supply.
This sustained growth is being driven by several converging factors: record interstate and international migration, critically low vacancy rates below 1%, limited new housing completions, and significant infrastructure investment, most notably the $21.7 billion T2D corridor. Median prices across T2D corridor suburbs have risen $80K to $160K in just two years, with suburbs like Glandore, Darlington, and the Inner South leading the charge well above the metro average.
For agents, this creates a compelling narrative: Adelaide is no longer an "affordable alternative", it's a high-growth market with structural supply constraints that will underpin price appreciation for years to come. Vendors can be approached with genuine confidence, and buyers need to understand the urgency of the current window.
How This Affects Us as Agents
The convergence of the T2D project, government land releases, and population growth creates a once-in-a-generation opportunity for real estate agents entering or expanding in the Adelaide market. Here's why:
- New housing corridors = new listings. Over 50,000 new homes in the pipeline means thousands of off-the-plan and land/house package listings in emerging suburbs, from Concordia to Dry Creek to Onkaparinga Heights.
- Existing stock appreciation. Homeowners in established suburbs near the T2D corridor are sitting on significant equity gains. Many don't realise how much their property has increased, creating appraisal and listing opportunities.
- Investor demand is surging. Interstate investors from Sydney and Melbourne are actively targeting Adelaide for its yield and capital growth. Agents with market knowledge and data-driven presentations will capture this demand.
- Rental market pressure. With vacancy rates below 0.5% in many Adelaide suburbs, property management portfolios are extremely valuable. Every new development area needs agents managing rentals from day one.
Where to Watch — Key Development Hotspots
Not all growth corridors are equal. Based on infrastructure timing, land release scale, and current market dynamics, these are the areas agents should be positioning in:
Dry Creek / Gillman
15,000+ homes, T2D spoil recipient, closest to CBD of the northern releases. First-mover advantage for agents establishing early.
Concordia (Gawler Belt)
10,000 homes, SA's largest single land release. Construction ready by 2029. Massive long-term listing pipeline.
Onkaparinga Heights (Hackham)
2,000 homes ready by September 2027. Southern corridor growth with strong first-home buyer demand.
Greater Seaton / West
1,452 homes in an established inner-west renewal zone. Premium median prices and high buyer competition.
Smithfield / Playford
3,000+ homes combined across two releases. Affordable entry point driving volume, ideal for agents targeting high transaction counts.
Thebarton (Brewery Site)
1,000 homes on a premium inner-city infill site. Mixed-use development attracts high-value buyers and investors.
Government Housing Projects Timeline
The SA Government's Housing Roadmap is accelerating major housing projects across the state. These are the key sites and readiness dates agents should track.
Source: Department for Housing and Urban Development (SA), dhud.sa.gov.au
Noarlunga
Subject to master planning
Playford Alive (Eastern)
Subject to master planning
Thebarton (West End Brewery)
Subject to master planning
Greater Seaton
Urban renewal
Smithfield
Stage 1, subject to master planning
Elizabeth South
John Rice Ave
Tapangka, Franklin St
Mixed use, complete by 2030
Magill (UniSA site)
Allotments TBD
Onkaparinga Heights
Housing construction ready
Concordia
Largest single land release in SA
Sellicks Beach
Housing construction ready
Total Pipeline from Timeline
20,000+ homes
across 10 major sites, housing construction ready by 2029
Greater Adelaide Greenfield Land Supply
Quarterly data to September 30, 2025. Reporting on land supply and development activity within selected greenfield and strategic monitoring areas across Greater Adelaide.
View official PlanSA DashboardLand Supply
Loading monitoring areas…
Annual Dwelling Completions
Dwelling completions to end of September 2025
Quarterly Development Activity
Monitoring Areas
Click a region to zoom on the map, or expand for details.
Outer North
Inner North
Northern Plains & Barossa
Adelaide West
Inner South
Outer South
Adelaide Hills
Fleurieu Peninsula
Murray Bridge
2024 Record Year
4,143 dwellings completed
The highest annual dwelling completion figure on record, with 2025 tracking strong at 3,276 through September across Greater Adelaide's greenfield corridors.
4,143
2024 Peak
11,143
Lots Created (2023–25)
9
Monitoring Areas
The T2D corridor is Adelaide's next growth engine.
With $21.7 billion in infrastructure investment, 50,000+ new homes in the pipeline, record migration fuelling demand, and vacancy rates at historic lows, the suburbs along the North-South Corridor represent the most compelling development opportunity in South Australia's history.
$21.7B
Investment
50K+
New Homes
2031
Opens