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This analysis uses Suburbs and Localities (SAL) boundaries, which can materially differ from Statistical Areas (SA2) even when sharing the same name.
SAL boundaries are defined by Australia Post and the Australian Bureau of Statistics to represent commonly-known suburb names used in postal addresses.
Statistical Areas (SA2) are designed for census data collection and may combine multiple suburbs or use different geographic boundaries. For comprehensive analysis, consider reviewing both boundary types if available.
est. as @ -- *
2021 Census | -- people
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Seacliff has an estimated 2,101 residents. That puts 2,878 residents on each square kilometre. Population is estimated from ABS Estimated Resident Population releases and GNAF address data, re-based from the 2021 Census and updated annually.
Detail
According to evaluations of ABS demographics data for the region alongside updated street locations validated by AreaSearch after the Census, the suburb of Seacliff has an estimated resident base of 2,101 in May 2026. This represents a contraction of 16 individuals (0.8%) relative to the 2021 Census, which counted 2,117 residents. The shift is based on a localized population estimate of 2,097, calculated by AreaSearch using the ABS June 2025 release of estimated resident numbers combined with subsequent property location updates. This total translates to a density of 2,878 persons per square kilometer, placing the suburb of Seacliff in the top quarter of Australian locations analyzed by AreaSearch.
Inward migration from international sources served as virtually the sole contributor to local population additions over the recent term. Projections generated by the ABS and Geoscience Australia released in 2024 with a 2022 baseline are utilized for each SA2 division. Where such metrics are unavailable, or for periods past 2032, calculations incorporate the 2023 state government projections by age group for regional and local areas based on 2021 records, scaled using weighted local-to-SA2 growth ratios. Looking ahead, the suburb of Seacliff is projected to experience growth slightly below the national median, increasing by 161 residents by 2041 under these consolidated geographic models, which equates to a 7.5% expansion over the 16 years.
Frequently Asked Questions - Population
46 new dwellings have been approved in Seacliff over the past five years, an average of 9 a year. That is 4.4 approvals per 1,000 residents. Approvals are currently running at an annualised 1, well below that longer-run average. Figures come from ABS building approvals aggregated to this Suburb (SAL) boundary and are updated monthly as the ABS releases them.
Detail
Data from ABS building approvals compiled by AreaSearch indicates that Seacliff averages about 9 residential approvals yearly, totaling 46 homes authorized across the last 5 financial years from FY-21 to FY-25, with a single property approved during FY-26 so far. Given the local population contraction, this rate of construction has been relatively sufficient, offering reasonable opportunities for purchasers. New structures carry a mean building cost of $713,000, pointing to developer emphasis on high-end, premium additions. Commercial development consents reached $4.5 million during the current financial year, reinforcing the residential focus of the neighborhood.
Seacliff registers approximately three-quarters of the per-capita construction volume seen across Greater Adelaide, ranking in the 6th percentile of all localities nationwide, which limits options for buyers and sustains demand for existing properties. Standalone houses represent 75.0% of recent approvals while semi-detached or townhouses make up 25.0%, preserving the low-density suburban atmosphere preferred by buyers seeking extra space. The ratio of 4201 residents for every new housing consent indicates a highly established property market. Long-term forecasts suggest Seacliff will add 157 residents by 2041, looking from the most recent AreaSearch quarterly figures. Existing rates of construction appear positioned to meet this demand comfortably, supporting favorable conditions for purchasers and potentially enabling growth beyond current expectations.
Frequently Asked Questions - Development
Development applications around Seacliff
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| Lodged | Address | Description | Type | Distance | Status |
|---|
SOURCE: Planning portals and council registers, compiled by AreaSearch. Distance & bearing measured from the suburb midpoint.
AreaSearch tracks 9 current infrastructure and development projects close to Seacliff, worth an estimated $518 million. 4 are already under construction and 2 are due for completion within three years. The pipeline spans residential development, education & training and retail. Records are compiled from Infrastructure Australia, state agencies, council planning portals and public announcements, reviewed and updated daily, then ranked by proximity, construction stage, completion horizon and project scale.
Detail
Local infrastructure projects, major works, and planning initiatives significantly shape area outcomes. In total, no projects have been identified by AreaSearch as likely to affect this locality. Key regional developments include the Adelaide Public Transport Capacity and Access, Adelaide's Inner And Outer Ring Route Capacity Improvements, the North South Corridor, and the SA Water Capital Work Delivery Contracts 2024-28, with details provided below for those of most relevance.
Professional plan users can use the search below to filter and access additional projects.
INFRASTRUCTURE SEARCH
Denotes AI-based impression for illustrative purposes only, not to be taken as definitive under any circumstances. Please follow links and conduct other investigations from the project's source for actual imagery. Developers and project owners wishing us to use original imagery please Contact Us and we will do so.
Frequently Asked Questions - Infrastructure
Flagstaff Road Upgrade
Upgrade of approximately 3.3 km of Flagstaff Road including duplication of the remaining three-lane section to a permanent four-lane divided carriageway, intersection improvements, upgraded drainage, shared walking and cycling paths, lighting and road safety improvements. Construction has been underway with staged traffic management and community updates.
Westfield Marion Expansion
Major $259 million expansion and renovation of Westfield Marion shopping centre by Scentre Group. Adding 52 specialty shops and 20 eateries, new ground floor mall, four-level carpark facing Diagonal Road. Expanding from 135,300sqm to 152,200sqm. Part of $500 million South Australian development pipeline including new retail spaces, fresh food precinct, dining options, and entertainment facilities. Enhanced parking and contemporary design updates. Creates up to 2,600 construction and retail jobs, strengthening position as premier southern suburbs retail destination.Introduction of paid parking for stays over 3 hours with ticketless system using numberplate recognition.
Residential Development at 1 Greenfield Road
Approved development opportunity for 3 stunning two-storey townhouses with water views on a re-zoned and prepared vacant land parcel. This site was previously subject to a larger mixed-use development application.
Oaklands Green
South Australia's largest social and affordable housing renewal project, transforming 16.5 hectares into a masterplanned community. The development delivers 680 new dwellings, comprising 235 social housing homes managed by Junction and 445 private/affordable homes. The project features 3.4 hectares of open space, including the expansion of Rajah Reserve and sustainable Green Star rated designs. Construction is staged over eight years with the first residents moved in during 2023.
Seaview Downs Primary School Redevelopment
Major upgrade project to deliver contemporary learning areas, new administration building, and demolition of ageing infrastructure, based on contemporary educational philosophies. The project received additional funding totaling $19.3 million.
Southern Suburbs Residential Policy Code Amendment
A proposed planning amendment affecting residential zones in Southern Suburbs, including Seaview Downs, to transition areas to Hills Neighbourhood Zone and facilitate low-density infill development.
OTR Seacombe Road Redevelopment
Upgrade of the existing OTR fuel and convenience site delivering a reconfigured car park, a convenience drive-through, 2.4m acoustic fencing, and new on-site amenities including dog wash and vacuum facilities. The store page indicates drive-through and dog wash services operating, consistent with works being completed.
Marion Cultural Centre Plaza Upgrade
The Marion Cultural Centre Plaza has been redeveloped to become a vibrant heart for the city, providing a space for community gatherings, celebrations, relaxation, and support for local businesses. The upgrade includes surface treatments, soft landscaping, tree planting, public art installations, and a new pedestrian crossing on Warracowie Way. It aims to enhance amenity with green spaces, strengthen community connections, offer flexibility for various functional uses, and create a sense of place aligned with the council's vision of a liveable, nature-valuing, engaged, connected, innovative, and prosperous community.The project also improved pedestrian and cyclist connectivity, safety, and amenity, linking local residential areas, Oaklands Station, MCC, SA Aquatic and Leisure Centre, Westfield, and other facilities on Milham Street, while retaining vehicle access to existing businesses and managing traffic.
1,160 residents of Seacliff are employed, from a labour force of 1,191. Unemployment sits at 2.6%, with participation at 67.1%. Weighted for its industry mix, the area's sectors are forecast to grow about 6.9% nationally over five years. That reflects industry composition only and makes no allowance for local population growth. The working-day population is estimated at 1,669, about 79% of the resident population, so more people leave the area for work than travel in. Unemployment and labour force come from ABS Small Area Labour Markets, updated quarterly; the industry and occupation profile is from the 2021 Census.
Detail
A highly qualified workforce characterizes Seacliff, alongside strong representation in crucial service sectors, a low jobless rate of 2.6%, and estimated annual jobs growth of 3.4% derived from localized area statistics. Working residents numbered 1,160 as of March 2026, while local unemployment sits 1.2% lower than the 3.8% recorded across Greater Adelaide. Labor market participation matches the regional average of 66.6% closely. Census records indicate a moderate 18.7% of the workforce operated from home, though this figure was influenced by pandemic-related restrictions. The primary sectors employing local residents are healthcare & social assistance, education & training, and professional & scientific services.
The area shows a pronounced concentration in education & training, with employment representation reaching 1.4 times the regional average. Conversely, manufacturing accounts for only 5.5% of local employment, compared to 7.0% across Greater Adelaide. The heavily residential nature of the locality means few jobs are situated within the neighborhood itself, as shown by comparing the count of active local workers with resident workers. Based on AreaSearch analytics combining SALM and ABS registers, local employment expanded by 3.4% over the 12-month period, while the total labor force grew by 3.1%, leading to a decrease in unemployment by 0.3 percentage points. Over the same span, Greater Adelaide saw jobs grow by 4.2% and the labor force rise by 4.0%, with its unemployment rate dropping by 0.2 percentage points. National employment projections from May-25 compiled by Jobs and Skills Australia provide context for future trends. These five and ten-year forecasts have been aligned with the local occupational structure to model future demand. Across Australia, jobs are expected to grow by 6.6% over five years and 13.7% over ten years, with wide variation between sectors. Weighting these sectoral forecasts against the local labor profile indicates Seacliff employment would rise by 6.9% in five years and 14.2% in ten years, though this simple extrapolation does not incorporate local demographic forecasts.
Frequently Asked Questions - Employment
Median household income in Seacliff is $1,931 a week (about $100,000 a year), with median personal income at $948 a week. ATO records put median taxable income at $62,396 a year against an average of $82,993. Household income is from the 2021 Census; taxable income is from ATO Taxation Statistics for the latest financial year available, indexed forward using the ABS Wage Price Index.
Detail
According to the latest postcode-level taxation records aggregated by AreaSearch for financial year 2023, Seacliff taxpayers recorded a median income of $62,396 and a mean income of $82,993. These figures rank highly on a national scale, comparing to a median of $54,808 and an average of $66,852 across Greater Adelaide. Adjusting for a 10.17% rise in the Wage Price Index since financial year 2023 yields estimated values of approximately $68,742 for the median and $91,433 for the average as of March 2026. Census figures from 2021 place local household, family, and individual incomes in the 67th percentile nationwide.
The most common income bracket comprises 29.7% of households earning between $1,500 - 2,999 weekly, representing 623 residents and aligning with the Greater Adelaide proportion of 31.8%. Higher-income households are well represented, with 30.2% earning more than $3,000 weekly, highlighting strong local purchasing power. Residents retain 87.7% of their earnings after servicing housing costs, and the local SEIFA socioeconomic status rank sits in the 8th decile.
Frequently Asked Questions - Income
Seacliff had 846 occupied dwellings at the 2021 Census, 66% detached houses and 14% apartments. 34% are owned with a mortgage, 25% rented and 42% owned outright. At that Census the median rent was $350 a week and the median mortgage repayment $1,950 a month. Rent absorbs 18.1% of household income here and mortgage repayments 23.3%. Dwelling stock, tenure and housing costs are 2021 Census measures — the only source that counts dwellings at this boundary size.
Detail
Residential property forms in Seacliff at the time of the last Census consisted of 66.3% separate houses and 33.8% alternative dwellings such as townhouses and flats, compared to Adelaide metro ratios of 75.2% and 24.9% respectively. Home ownership rates were notably higher than the metropolitan benchmark, standing at 41.8%, while mortgaged properties accounted for 33.5% and rented residences made up 24.6%. The median monthly mortgage cost was $1,950, considerably higher than the Adelaide metro average of $1,562. The median weekly rental cost was $350, compared to $320 across the Adelaide metro area.
Nationally, local mortgage commitments exceed the Australian average of $1,863, whereas rental costs remain below the countrywide median of $375.
Frequently Asked Questions - Housing
Seacliff counted 846 households at the 2021 Census, averaging 2.4 people each. 29% are couples with children, against 34% couples without children. 24% of households are people living alone, and families average 1.5 children. Household and family composition is measured only by the Census, so these are 2021 figures.
Detail
Families make up 72.9% of all local households, consisting of couples with offspring at 28.7%, couples without children at 34.1%, and single-parent homes at 10.1%. The remaining 27.1% are non-family arrangements, with single-person households representing 24.2% and group houses comprising 2.4%. The average household size of 2.4 residents sits slightly under the Greater Adelaide average of 2.5.
Frequently Asked Questions - Households
43.5% of adults in Seacliff hold a university qualification, including 27.7% with a bachelor degree and 11.4% with postgraduate qualifications, higher than 87% of areas nationally. A further 17.8% hold a vocational qualification. 1 school serves the area, with 378 enrolment places and an average ICSEA of 1,093 against a national benchmark of 1,000. Qualifications come from the 2021 Census; school enrolments, ICSEA and results come from ACARA's current release.
Detail
Residents of Seacliff hold higher qualifications than the wider region, with 43.5% of people aged 15+ possessing university degrees, compared to 25.7% across SA and 28.1% within the SA4 territory. This high concentration of degrees equips the population for knowledge-intensive sectors. Undergraduate degrees are held by 27.7% of residents, followed by postgraduate degrees at 11.4% and graduate diplomas at 4.4%. Vocational education is also common, with 30.1% of those aged 15+ holding technical credentials, consisting of advanced diplomas at 12.3% and certificates at 17.8%. A high level of educational engagement is evident, with 26.1% of the population currently enrolled in study.
This includes 8.2% in primary schools, 6.9% in high schools, and 6.2% undertaking university or college courses.
Frequently Asked Questions - Education
Schools Detail
Public transport in Seacliff reaches 13 stops on 12 routes, timetabled for about 1,100 services a week. The typical home sits about 170 m from its nearest stop. Buses carry the largest share of public transport commuters. Households keep an average of 1.4 vehicles. Stop and service counts are built from operators' published GTFS timetables and refresh with each timetable release; vehicle ownership is from the 2021 Census.
Detail
Public transit records show 13 active transit connections located in Seacliff, providing a combination of rail and bus services. These stops are served by 12 different routes, which provide a total of 1,127 passenger trips every week. Accessibility is high, with residents living an average of 169 meters from their nearest transit point. Because the area is mainly residential, most workers travel out of the suburb, with private cars being the primary mode of travel for 84% of workers, and trains used by 10%. Average vehicle ownership is 1.4 per home.
About 18.7% of residents worked from home, according to the 2021 Census, which was influenced by pandemic conditions. Services run at an average of 161 trips daily across all transit routes, which averages out to approximately 86 weekly trips for each stop.
Frequently Asked Questions - Transport
Transport Stops Detail
67.7% of residents in Seacliff report no long-term health condition, a healthier profile than 84% of areas nationally. 3.8% need daily assistance with core activities, and 59.8% hold private health cover. The standardised death rate runs at 3.4 per 1,000 residents. Health conditions, assistance needs and insurance are 2021 Census measures; the death rate comes from current ABS releases.
Detail
Health indicators show excellent results in Seacliff, based on analysis of mortality statistics and long-term health issues, which show low rates of standard illnesses across all age brackets. Private health insurance coverage is high, encompassing roughly 60% of the population, which represents 1,255 people, compared to 52.7% across Greater Adelaide. The primary long-term conditions recorded locally were arthritis and mental health challenges, affecting 9.5 and 7.5% of the population respectively. Meanwhile, 67.7% of residents reported having no long-term medical conditions, compared to 67.9% for Greater Adelaide. Health statistics for the working-age population are typical.
Residents aged 65 and over constitute 23.8% of the community, representing 500 people, which is higher than the Greater Adelaide figure of 19.2%. Senior health outcomes are strong, with national rankings matching those of the broader community.
Frequently Asked Questions - Health
Seacliff is largely Australian-born, at 76.2% of residents, with 8.1% speaking a language other than English at home. The largest reported ancestries are English (33.7%) and Australian (22.5%). Ancestry, language and country of birth are counted only by the Census, so these are 2021 figures.
Detail
Seacliff shows similar levels of cultural diversity to the wider metropolitan area, with 76.2% of residents born in Australia, 89.7% holding citizenship, and 91.9% speaking only English at home. Christianity is the main religious affiliation, representing 41.4% of the population. The most visible divergence is in the proportion of Islamic adherents, who make up 0.7% of the community compared to 3.0% across Greater Adelaide. Regarding parental country of birth, the three most common backgrounds are English at 33.7%, which is higher than the regional average of 27.8%, Australian at 22.5%, and Irish at 8.8%.
Differences also exist for other groups: Polish heritage is recorded at 1.3% compared to 1.0% regionally, Welsh at 0.8% compared to 0.6%, and German at 5.9% compared to 5.1%.
Frequently Asked Questions - Diversity
The median resident of Seacliff is 46, older than 82% of areas nationally. 21.9% of residents are aged 15 to 34. Age cohorts are not raw Census counts: the Census split is re-based to the latest ABS population estimates and state projections.
Detail
The median age in Seacliff is 46 years, which is higher than the Greater Adelaide median of 39 and the Australian median of 38 years. Residents aged 65 - 74 represent a large portion of the population at 14.7%, while the 25 - 34 bracket is smaller at 10.6% than in Greater Adelaide. The proportion of 65 - 74 year-olds is higher than the national average of 9.4%. Since 2021, the 75 to 84 bracket has increased from 5.4% to 7.9%, and the 15 to 24 group has risen from 9.7% to 11.3%.
In contrast, the 55 to 64 group has decreased from 16.2% to 13.6%. Demographic projections for 2041 indicate shifts, with the 45 to 54 cohort expected to grow by 14%, adding 38 residents to reach 310, while the 35 to 44 age bracket is projected to decrease by 5.
Frequently Asked Questions - Age
Data & MethodBoundaries, Sources & Method for Seacliff
9 of 14 data sections on this page were updated within the last 12 months — the newest current to Aug 2026.
Everything is aggregated to the Suburb (SAL) boundary shown above, on a 2021 Census baseline. Only 3 sections — housing, households and cultural diversity — still wait on the 2026 Census.
The ledger — source, cycle and currency by section
| Section | Source & update cycle | Currency |
|---|---|---|
| Updated within the last 12 months 9 sections | ||
| Population | ABS, GNAF, Geoscience Australia Annual (ABS ERP) | May 2026 3 months ago headline measures · 2021 Census baseline |
| Re-based to the ABS Estimated Resident Population (June 2025 release) and updated with new dwellings from GNAF address data. Current to May 2026, with the 2021 Census supplying the small-area baseline. | ||
| Age profile | ABS, Geoscience Australia, State governments Annual | May 2026 3 months ago headline measures · 2021 Census baseline |
| Age cohorts are re-based to the latest ABS population estimates and state projections, current to May 2026. Each cohort is held as a Census baseline and a current estimate. | ||
| Development & approvals | ABS, GNAF Monthly (ABS approvals) | Jun 2026 2 months ago headline measures · May 2026 baseline |
| Property sales & rents | Valuer General, Rental Board, ABS Weekly sales, quarterly rents | Aug 2026 this month all 21 measures |
| Sales from the state Valuer General register, refreshed weekly, and rents from quarterly rental bond lodgements. Both are read live each time this page loads, current to Aug 2026. | ||
| Infrastructure projects | Infrastructure Australia, Local governments Daily | May 2026 3 months ago all 2 projects tracked here |
| Project pipeline maintained continuously from Infrastructure Australia, state agencies, local government and public announcements. Records are added and revised daily; this area was last updated May 2026. | ||
| Employment | ABS, DEWR, JSA Quarterly (ABS SALM) | Mar 2026 5 months ago headline measures · 2021 Census baseline |
| Unemployment and labour force from ABS Small Area Labour Markets, current to Mar 2026. The growth outlook applies Department of Employment (now Jobs and Skills Australia) forecasts for all 19 industry divisions to the local industry mix, so it measures sector composition rather than local expansion and makes no allowance for population growth. Job demand comes from the same agency via its Internet Vacancy Index; industry and occupation structure from the 2021 Census. | ||
| Education | ABS, ACARA Annual (ACARA) | Aug 2026 this month headline measures · 2021 Census baseline |
| Transport | ABS, State Transport Departments Each timetable release | Jul 2026 last month headline measures · 2021 Census baseline |
| Services & amenities | Provider directories, ACECQA Continuous | Jul 2026 last month all 14 measures |
| Annual and financial-year sources 2 sections | ||
| Income | ABS, ATO Annual (ATO) | FY 2023 3 years ago headline measures · 2021 Census baseline |
| ATO taxable income statistics for FY 2023, indexed forward using the Wage Price Index. Census household income provides the distribution detail. | ||
| Health | ABS, ATO Annual | 2024 2 years ago headline measures · 2021 Census baseline |
| Census-measured — next update: 2026 Census 3 sections No more current small-area source exists for these, so they are labelled as Census-measured rather than implied to be current. | ||
| Housing | ABS 5-yearly (Census) | 2021 Census next update 2026 all 30 measures |
| Households | ABS 5-yearly (Census) | 2021 Census next update 2026 all 18 measures |
| Cultural diversity | ABS, Geoscience Australia 5-yearly (Census) | 2021 Census next update 2026 all 44 measures |
"Currency" is the most recent release feeding that section. Where the Census supplies the structural baseline underneath a current headline figure, the row says so.
How the numbers are built
Population
The Census provides the small-area baseline, aggregated from mesh blocks to this boundary. It is then re-based to the ABS Estimated Resident Population (June 2025 release), and new dwellings built since Census night are counted from address data. The headline figure is therefore a current estimate for May 2026, not a 2021 count (2,117 at the 2021 Census → 2,101 now). Annual growth rates are compound (CAGR), not simple averages.
Age profile
Cohort shares are not raw Census counts. Every cohort is held as a pair — the Census baseline and a current estimate — and the split is re-based using ERP and state population projections, current to May 2026. Median age is the Census median plus modelled change since. Charts that show both are labelled "2021 Census vs Current Estimate".
Property sales
Sourced from the state valuation authority's sales register — current, not Census, and refreshed weekly. Medians are calculated from settled transactions in the period shown; periods with very low transaction counts are flagged or suppressed, because a handful of sales can move a median substantially.
Rents
Derived from state rental bond lodgement data, by dwelling type and bedroom count. Bonds are lodged at the start of a new tenancy, so this reflects new lettings, not the whole rented stock.
Development & infrastructure
Building approvals come from current ABS releases; development applications are collected from council and state planning portals; the infrastructure pipeline is compiled from Infrastructure Australia and local government sources. Applications are matched to this boundary by address or coordinates, so very recent lodgements may not yet appear.
Employment & income
Industry and occupation structure comes from the Census, but the headline labour-market indicators do not. Unemployment and labour force are derived from ABS Small Area Labour Markets (quarterly). The employment outlook applies Department of Employment forecasts for all 19 industry divisions to this area's own industry mix (the agency is now Jobs and Skills Australia), as does the Internet Vacancy Index used for job demand. Because it is weighted on industry composition alone, that outlook carries no allowance for local population growth — in fast-growing areas the real rise in local jobs will typically be higher. Income combines Census household income with ATO taxable-income statistics for FY 2023, indexed forward using the Wage Price Index.
Education, transport & amenities
School enrolments, ICSEA and performance come from ACARA's current release, not the Census. Public transport stops and service frequency are derived from GTFS timetable feeds published by state transport departments. Services and amenities are proximity and count scores built from provider directories, refreshed on their own cycle. The Census contributes only the travel-to-work and qualification measures.
Rankings and benchmarks. Where we rank this area, the comparison set is every area of the same boundary type — suburbs against suburbs, SA2s against SA2s. Benchmarks compare this area against its greater capital city region and the national figure for the same measure and period.
Limits worth knowing. Small areas carry larger error margins, and the ABS introduces small random adjustments to Census counts to protect confidentiality — so totals may not sum exactly. Estimates re-based from regional data describe the area's expected trajectory, not a direct count of it. Figures are indicative for research and are not financial, planning or valuation advice.
Cross-check us. The Census baseline for this boundary is at ABS 2021 Census QuickStats (SAL41311). QuickStats reports 2021 only — the figures on this page are more current wherever the ledger shows a later date.