Aldinga Beach (5173) sits on the outer southern fringe of Adelaide, roughly 45 kilometres from the CBD, within the City of Onkaparinga. Its SEIFA IRSAD score of 928 places it in decile 3 of 10 nationally and at the 29th percentile within South Australia, firmly in the disadvantaged band. That reading reflects a population whose income, occupation mix, and access to resources sit meaningfully below the national mean of 1000. Investors should treat this as a structural signal, not a temporary condition, and weigh it carefully against the suburb's genuine coastal amenity.
ABS 2021 IRSAD release. Score 928 (national mean = 1000).
A SEIFA score of 928 is 72 points below the national mean, and landing in the bottom third of South Australian suburbs reinforces that this is not a high-income catchment. PropertyRanker uses this reading as a primary input for three of its twelve scoring criteria: economic_strength, hazard_risk, and entry_point_risk. On economic_strength, a disadvantaged SEIFA band typically signals constrained household budgets, which can compress rental growth and limit the pool of owner-occupier buyers who push prices upward. On entry_point_risk, a lower-income suburb can offer a lower nominal entry price, but it also tends to carry higher vacancy sensitivity when economic conditions soften. The hazard_risk criterion draws on SEIFA partly because lower-socioeconomic coastal suburbs often carry a higher proportion of older stock and less insurance resilience, though the specific flood, bushfire, and coastal erosion overlays for any individual lot must be checked separately.
The suburb does carry genuine demand drivers that sit outside the SEIFA frame. It is a beachside location with a protected aquatic reserve, proximity to the McLaren Vale wine region, and a preserved conservation park on its southern edge. A proposed extension of the Seaford Rail Line through to Aldinga Beach, with a master-planned community of over 800 dwellings flagged by Renewal SA, represents a potential infrastructure catalyst, though planning timelines for such projects are inherently uncertain and should not be treated as a near-term certainty.
For strategy matching, the suburb's SEIFA profile and coastal positioning make it a candidate to examine under the Balanced or High Yield strategies (gross yield anchors around 5 to 6 percent) rather than the Capital Growth strategy, which typically suits higher-SEIFA, tighter-supply markets. Whether current rents and prices actually support those yield anchors requires a live scoring of the specific listing.
Aldinga Beach recorded a median house price of $840,000 as of the March quarter 2026 (up 7% year-on-year per the Office of the Valuer-General SA, as reported by inthesuburbs.com.au), with CoreLogic data via yourinvestmentpropertymag.com.au citing $810,000 and 8% annual growth to April 2026 and 245 house sales over the same period. HtAG Analytics (August 2026) reports stock on market at just 0.19% and inventory at 0.72 months, well below the balanced-market threshold, with a vacancy rate of 1.70% and 12% year-on-year price growth, pointing to tight supply and firm buyer demand. No vendor discount figure was published at the suburb level across sources retrieved.
Anchor points pulled per refresh from publicly available suburb profiles. Approximate; not a moving average.
Vacancy at 1.70% is stable and not distressed, stock on market is extremely low at 0.19% with inventory at 0.72 months driving consistent price growth, and days on market of 33-47 days are steady, pointing to a warming market with firm demand and constrained supply.
Sources: Aldinga Beach SA 5173: Suburb Profile & Property Report | YIP (2026-07-14); Aldinga Beach, SA 5173 Property Market and House Prices 2026 | HtAG (2026-08-05); Aldinga Beach SA 5173 | Established Suburb in Onkaparinga | inthesuburbs.com.au (2026-03-31); Aldinga Beach Property Market and Trends | OpenAgent (2025-11-12); Investment Property Aldinga Beach SA 5173 | realestateinvestar.com.au (2023-01-01) · Refreshed 29 Sep 2026
Aldinga Beach and the surrounding Aldinga growth area are being reshaped by major road infrastructure and a large master-planned housing release. The completion of the Main South Road duplication and a new Aldinga interchange has improved access to Adelaide and the Fleurieu Peninsula, while Renewal SA's 45 hectare site with Villawood Properties is set to deliver hundreds of new homes with civil works due to start in 2026. Local council roadworks and a preserved rail corridor for a possible future Seaford line extension round out a story of infrastructure catching up with, and planning ahead of, continued residential growth.
The $810.4 million Fleurieu Connections project duplicated Main South Road between Aldinga and Sellicks Beach, including a new Aldinga interchange, underpass and shared use path, improving the key link between Adelaide and the Fleurieu region.
Main South Road duplication opens to traffic as part of $810.4 million project (2026-02-10)
The new Aldinga Bridge is a key feature of the Aldinga Interchange, which realigns Aldinga Beach Road and Aldinga Road junctions to create a safer, more efficient connection as part of the Main South Road duplication.
Renewal SA appointed Villawood Properties to develop a 45 hectare site bordered by Quinliven Road, Main South Road, Aldinga Beach Road and How Road, with a master plan for more than 800 homes including townhouses, detached and semi-detached dwellings and an over 55s lifestyle village, with at least 25 percent affordable housing.
Renewal SA - Aldinga (2026-02-17)
A 60 metre wide rail corridor has been preserved through the new Aldinga estate site to allow for a potential future extension of the Seaford rail line to Aldinga, with the corridor to be landscaped as open space in the meantime.
Developer selected to create 800 home Aldinga development (2026-02-05)
A near $4 million upgrade, including a $1.898 million federal grant under the Safer Local Roads and Infrastructure Program, will fund reconstruction and widening of Norman Road in Aldinga Beach to address pavement defects.
Major road rebuild for Aldinga Beach (2026-02-19)
A council-funded roundabout upgrade at the intersection of How Road and Aldinga Beach Road has been completed, improving local traffic flow near the new residential growth area.
Updated 19 Jul 2026. Items link to their original sources. Compiled by AI from public reporting; verify anything material before relying on it.
PropertyRanker scores any Australian property against 12 criteria across three pillars: Growth, Cashflow, and Risk. SEIFA is a primary signal for economic strength and a supporting one for entry-price risk. It also informs the crime side of hazard risk, though physical overlays like flood, bushfire and coastal exposure, and recorded crime data where available, take priority there. The decile of 3 shown above gives a listing in Aldinga Beach a softer starting line on economic strength, though often a firmer one on entry-price risk, since less advantaged postcodes usually carry lower entry prices.
On top of that, PropertyRanker chooses one of four strategies (Balanced, Growth, Yield, Regional) and applies a per-strategy yield anchor. The anchors are 3.5% for Growth, 5% for Balanced, 6% for Yield, and 7% for Regional. A postcode at this level tends to make the Yield (6% anchor) and Regional (7% anchor) strategies more reachable, because a lower entry price lifts the gross yield a listing can achieve, while a Growth result usually depends on a specific catalyst such as an infrastructure or renewal pipeline.
Read the scoring guide for the full criteria list and how the verdict thresholds work.
A postcode-level SEIFA reading cannot see the individual listing, and a weak macro signal does not automatically make every property here a poor investment. Before drawing any conclusion, verify the following. Check the specific lot's flood, coastal erosion, and bushfire overlay status through the SA Planning Portal, because proximity to the Aldinga Washpool and the conservation park means environmental constraints vary significantly by street. Confirm the current SQM vacancy rate for 5173, because a coastal suburb with a disadvantaged SEIFA profile can experience sharper vacancy swings than the metro average. If the listing is a unit or strata title, obtain the body corporate financials and sinking fund balance, as older coastal stock can carry deferred maintenance costs that erode yield. Price the listing against recent comparable sales in the same street type rather than suburb-wide medians. Then score the specific listing in PropertyRanker for a verdict that accounts for what this postcode-level reading cannot see: current SQM vacancy, body corporate health, flood and overlay status, and pricing against recent comparable sales.
The SEIFA IRSAD score of 928 places Aldinga Beach in the disadvantaged band, decile 3 of 10 nationally, which signals a below-average income and occupation base. That structural characteristic constrains rental growth potential and the depth of the owner-occupier buyer pool. The suburb does have genuine coastal amenity and a proposed rail extension that could shift the demand picture over time, but neither factor overrides the macro signal on its own. Whether a specific listing here stacks up depends on the yield, vacancy, and overlay data for that individual property, not the suburb label.
Given the disadvantaged SEIFA reading and the coastal, outer-suburban location, the Balanced or High Yield strategies (gross yield anchors around 5 to 6 percent) are the more logical frames to test here than the Capital Growth strategy, which typically suits higher-SEIFA, supply-constrained inner markets. Whether current rents and prices in 5173 actually clear those yield thresholds is a live question that changes with the market. Score the specific listing in PropertyRanker to see whether the numbers support either strategy at the time of your analysis.
The primary macro risk is the disadvantaged SEIFA profile, which points to a tenant and buyer pool with limited income headroom, making the suburb more sensitive to vacancy spikes during economic downturns. The coastal and conservation-park setting introduces environmental overlay risks, including potential flood, coastal erosion, and bushfire constraints that vary significantly by street and lot. Distance from the Adelaide CBD (roughly 45 kilometres) means the suburb is car-dependent for most daily needs, which can limit tenant demand if fuel or transport costs rise. Each of these risks operates at the individual listing level, so a site-specific check of overlays and vacancy data is essential.
PropertyRanker uses the SEIFA IRSAD reading as a primary input for three of its twelve scoring criteria: economic_strength, hazard_risk, and entry_point_risk. For Aldinga Beach, the score of 928 (decile 3, 29th percentile in South Australia) will weigh negatively on those three criteria relative to the national mean of 1000. However, SEIFA sits on the macro side of the model and cannot see the specific street, the build year, the strata health, or the current vacancy rate for the listing. The remaining nine criteria draw on listing-level and real-time data, so the final score for a specific property can differ substantially from what the postcode-level SEIFA signal alone would suggest.
Aldinga Beach shares postcode 5173 with Port Willunga to the north and the inland locality of Aldinga to the east, and sits adjacent to Maslin Beach (5170) to the north and Sellicks Beach (5174) to the south. All of these suburbs fall within the City of Onkaparinga and share a broadly similar outer-southern coastal character, so SEIFA conditions across the cluster tend to be comparable rather than sharply differentiated. Investors comparing these suburbs should check whether individual listings in each postcode offer meaningfully different yield or vacancy profiles, rather than assuming one coastal suburb in this corridor is structurally superior to another.
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