Seacliff

Seacliff has seen population growth performance typically on par with national averages when looking at short and medium term trends

As of May 2026, the estimated population of the suburb of Seacliff is around 2,101 people. This reflects a decrease of 16 individuals since the 2021 Census, which reported a population of 2,117. The current resident population estimate of 2,097 comes from AreaSearch's analysis following examination of the latest ERP data release by the ABS in June 2025 and address validation since the Census date. This results in a population density ratio of 2,878 persons per square kilometer, placing Seacliff in the upper quartile relative to national locations assessed by AreaSearch. Overseas migration was primarily responsible for population growth during recent periods.

AreaSearch adopts ABS/Geoscience Australia projections for each SA2 area, released in 2024 with a base year of 2022. For areas not covered and years post-2032, the SA State Government's Regional/LGA projections by age category are used, based on 2021 data and released in 2023, with adjustments made employing a method of weighted aggregation of population growth from LGA to SA2 levels. Future demographic trends anticipate a population increase just below the median of national statistical areas, with Seacliff expected to grow by 161 persons to reach 2,262 by 2041 based on aggregated SA2-level projections, reflecting an overall increase of 7.5% over the 16-year period.

Residential development activity is slightly higher than average within Seacliff when compared nationally

AreaSearch analysis of ABS building approval numbers shows Seacliff had approximately 14 new homes approved annually over the past five financial years, totalling around 70 homes. In FY-26 so far, 9 approvals have been recorded. This averages out to about 1.8 new residents per year per dwelling constructed between FY-21 and FY-25. New homes are being built at an average expected construction cost value of $713,000, indicating a focus on the premium segment with upmarket properties.

In this financial year, $4.5 million in commercial development approvals have been recorded, suggesting limited commercial development focus. Compared to Greater Adelaide, Seacliff shows similar construction activity per person, maintaining market equilibrium consistent with surrounding areas. New development consists of 73.0% standalone homes and 27.0% attached dwellings, preserving the area's suburban nature with a preference for detached housing attracting space-seeking buyers.

The location has approximately 141 people per dwelling approval, indicating a low density market. According to AreaSearch's latest quarterly estimate, Seacliff is projected to gain 157 residents by 2041. Based on current development patterns, new housing supply should meet demand readily, offering good conditions for buyers and potentially facilitating population growth beyond current projections.

Seacliff has limited levels of nearby infrastructure activity, ranking in the 19thth percentile nationally

No infrastructure changes are currently known to impact the area. Zero projects have been identified by AreaSearch as likely to affect it. Key projects include Adelaide Public Transport Capacity and Access, Adelaide's Inner And Outer Ring Route Capacity Improvements, North South Corridor, and SA Water Capital Work Delivery Contracts 2024-28.

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AreaSearch analysis reveals Seacliff significantly outperforming the majority of regions assessed nationwide

Seacliff has a highly educated workforce with significant representation in essential services sectors. Its unemployment rate was 2.6% as of December 2025, compared to Greater Adelaide's 3.8%. Employment growth over the past year was estimated at 2.3%, based on AreaSearch aggregation of statistical area data.

As of December 2025, 1,142 residents were in work and workforce participation was at par with Greater Adelaide's 66.0%. According to Census responses, 18.7% of residents worked from home. Dominant employment sectors include health care & social assistance, education & training, and professional & technical services. Seacliff has a particular specialization in education & training, with an employment share 1.4 times the regional level.

Manufacturing employs only 5.5% of local workers, below Greater Adelaide's 7.0%. The area appears to offer limited local employment opportunities, indicated by the count of Census working population vs resident population. Over a 12-month period ending December 2025, employment increased by 2.3%, while labour force increased by 2.4%, leaving unemployment broadly flat. In contrast, Greater Adelaide experienced employment growth of 4.2% and labour force growth of 3.9%, with a 0.3 percentage point drop in unemployment. Jobs and Skills Australia's national employment forecasts from May-25 suggest potential future demand within Seacliff. These projections indicate national employment should expand by 6.6% over five years and 13.7% over ten years, with varying growth rates between industry sectors. Applying these industry-specific projections to Seacliff's employment mix suggests local employment should increase by 6.9% over five years and 14.2% over ten years, based on a simple weighting extrapolation for illustrative purposes.

The area exhibits notably strong income performance, ranking higher than 70% of areas assessed nationally through AreaSearch analysis

The median taxpayer income in Seacliff was $62,396 in financial year 2023. The average income was $82,993. This is among the highest in Australia. In comparison, Greater Adelaide had a median income of $54,808 and an average income of $66,852. Based on Wage Price Index growth, current estimates suggest the median income would be approximately $68,742 as of March 2026, with the average being around $91,433. According to the 2021 Census, incomes in Seacliff clustered around the 67th percentile nationally. The predominant income cohort was 29.7% of locals (623 people) earning between $1,500 and $2,999 per week. This is similar to the metropolitan region where 31.8% fall into this bracket. Economic strength in Seacliff is evident with 30.2% of households earning high weekly incomes exceeding $3,000, supporting elevated consumer spending. After housing costs, residents retain 87.7% of their income, indicating strong purchasing power. The area's SEIFA income ranking places it in the 8th decile.

Seacliff displays a diverse mix of dwelling types, with above-average rates of outright home ownership

The latest Census evaluation found that dwelling structures in Seacliff comprised 66.3% houses and 33.8% other dwellings (semi-detached, apartments, 'other' dwellings), compared to Adelaide metro's 76.2% houses and 24.9% other dwellings. Home ownership in Seacliff stood at 41.8%, with mortgaged properties at 33.5% and rented dwellings at 24.6%. The median monthly mortgage repayment was $1,950, higher than Adelaide metro's $1,562. Median weekly rent in Seacliff was $350, compared to Adelaide metro's $320. Nationally, Seacliff's mortgage repayments were higher at $1,863 and rents lower at $375.

Seacliff has a typical household mix, with a lower-than-average median household size

Family households constitute 72.9% of all households, including 28.7% couples with children, 34.1% couples without children, and 10.1% single parent families. Non-family households account for the remaining 27.1%, with lone person households at 24.2% and group households comprising 2.4%. The median household size is 2.4 people, which is smaller than the Greater Adelaide average of 2.5.

Seacliff shows strong educational performance, ranking in the upper quartile nationally when assessed across multiple qualification and achievement indicators

Educational attainment in Seacliff is notably higher than broader benchmarks. As of a recent report, 43.5% of residents aged 15 and above hold university qualifications, compared to 25.7% in South Australia (SA) as a whole and 28.1% in the SA4 region. The area's educational advantage is substantial, with bachelor degrees being the most common at 27.7%, followed by postgraduate qualifications at 11.4% and graduate diplomas at 4.4%. Vocational credentials are also prominent, with 30.1% of residents aged 15 and above holding such qualifications, including advanced diplomas (12.3%) and certificates (17.8%).

Educational participation is high in Seacliff, with 26.1% of residents currently enrolled in formal education. This includes 8.2% in primary education, 6.9% in secondary education, and 6.2% pursuing tertiary education.

Transport servicing is high compared to other areas nationally based on assessment of service frequency, route connectivity and accessibility

Seacliff has 13 operational public transport stops offering a mix of train and bus services. These stops are served by 12 different routes, collectively facilitating 1,127 weekly passenger trips. The area's transport accessibility is rated as excellent, with residents typically residing 169 meters from the nearest stop. As a predominantly residential zone, most commuters travel outward. Cars remain the primary mode of transportation at 84%, while train usage stands at 10%. On average, there are 1.4 vehicles per dwelling.

According to the 2021 Census, 18.7% of residents work from home, which may be influenced by COVID-19 conditions. Service frequency averages 161 trips daily across all routes, equating to approximately 86 weekly trips per individual stop.

Seacliff's residents boast exceedingly positive health performance metrics with very low prevalence of common health conditions across all age groups

Health outcomes data shows excellent results across Seacliff, as per AreaSearch's assessment of mortality rates and chronic condition prevalence, with very low prevalence of common health conditions across all age groups. The rate of private health cover is exceptionally high at approximately 60% of the total population (1,255 people), compared to 52.7% across Greater Adelaide.

The most common medical conditions are arthritis and mental health issues, affecting 9.5% and 7.5% of residents respectively, while 67.7% report being completely clear of medical ailments, similar to the 67.9% in Greater Adelaide. Health outcomes among the working-age population are broadly typical. The area has 23.8% of residents aged 65 and over (500 people), higher than the 19.2% in Greater Adelaide. Health outcomes among seniors are particularly strong, with national rankings broadly in line with the general population.

In terms of cultural diversity, Seacliff records figures broadly comparable to the national average, as found in AreaSearch's assessment of a number of language and cultural background related metrics

Seacliff's population was found to be roughly in line with the wider region's average in terms of cultural diversity, with 76.2% born in Australia, 89.7% being citizens, and 91.9% speaking English only at home. Christianity was the main religion in Seacliff, comprising 41.4% of its population. However, Islam was overrepresented, making up 0.7%, compared to 3.0% across Greater Adelaide.

The top three ancestry groups were English (33.7%), Australian (22.5%), and Irish (8.8%). Notably, Polish (1.3%) and Welsh (0.8%) were also overrepresented in Seacliff compared to the regional averages of 1.0% and 0.6%, respectively, while German was slightly overrepresented at 5.9%.

Seacliff hosts an older demographic, ranking in the top quartile nationwide

Seacliff's median age is 46 years, significantly higher than Greater Adelaide's average of 39 and Australia's national average of 38 years. The age profile shows that those aged 65-74 make up 14.7% of the population, a much larger proportion than in Greater Adelaide or nationally (9.4%). Meanwhile, those aged 25-34 constitute only 10.6%, lower than the Greater Adelaide average. Between 2021 and present, the 75 to 84 age group has increased from 5.4% to 7.9%, while the 15 to 24 cohort has risen from 9.7% to 11.3%. Conversely, the 55 to 64 age group has decreased from 16.2% to 13.6%. By 2041, population forecasts indicate that the 45 to 54 age group is expected to grow by 14%, adding 38 residents to reach a total of 310. However, numbers in the 35 to 44 age range are projected to fall by 5%.