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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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Seaford Heights has an estimated 2,438 residents, up from 1,079 at the 2021 Census — a change of 1,359 people, or 125.9%. Growth has averaged 22.6% a year over five years, faster than 99% of areas nationally. 393 new addresses have been validated here since Census night. Interstate and internal migration accounts for 81.0% of that increase. That puts 1,409 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 ABS demographic updates for the surrounding region and recent home addresses verified by AreaSearch since the Census, the suburb of Seaford Heights has a resident count of approximately 2,438 as of May 2026. This represents a growth of 1,359 people (125.9%) from the 2021 Census, which counted 1,079 individuals. The estimate is based on a resident figure of 2,403 determined by AreaSearch using the latest ABS ERP release (June 2025) plus 393 verified new addresses registered after the Census. This population level results in a density of 1,409 persons per square kilometer, exceeding the typical ratio across national locations tracked by AreaSearch.
The 125.9% expansion rate of the suburb of Seaford Heights since the 2021 census outpaced the SA3 area (5.8%) and the broader SA4 region, making it a regional growth leader. The primary driver of this growth was interstate migration, accounting for roughly 81.0% of population increases, with overseas arrivals and natural increase also making positive contributions. Projections for each SA2 area from ABS and Geoscience Australia, published in 2024 with a 2022 base, are utilized by AreaSearch. For any SA2 regions lacking these figures, and for dates after 2032, population projections by age group from the SA State Government, published in 2023 using 2021 data, are adjusted using weighted aggregation from the LGA to the SA2 level. Looking ahead, the suburb of Seaford Heights is expected to experience population expansion above the national median, gaining 620 residents by 2041 based on compiled SA2 projections, which represents a 24.0% increase over the 16 years.
Frequently Asked Questions - Population
470 new dwellings have been approved in Seaford Heights over the past five years, an average of 94 a year. That places the area in the 97th percentile for residential development activity nationally, about 39 approvals per 1,000 residents a year. Of the 71 dwellings approved in the latest reporting year, 90% were detached houses and the rest townhouses or apartments. Approvals are currently running at an annualised 76, broadly in line with 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 on ABS building approvals allocated from regional statistics show that Seaford Heights has averaged approximately 94 new residential approvals annually, matching an estimated 470 properties over the past 5 financial years. In the current FY-26 period, 70 approvals have been logged. With an average of 3.3 new residents added per year for every completed dwelling between FY-21 and FY-25, construction is failing to keep pace with demand, which typically intensifies buyer competition and exerts upward pressure on prices. The average estimated value of these new constructions is $302,000. Additionally, commercial approvals reached $2.7 million during this financial year, pointing to a quiet commercial construction sector.
New home approvals per capita in Seaford Heights are 1485.0% higher than the Greater Adelaide average, offering home buyers a wider selection of properties, despite a recent deceleration in building activity. This rate is also significantly above the national benchmark, highlighting strong developer interest. Recent completions consist of 90.0% standalone houses and 10.0% medium to high-density dwellings, preserving the traditional low-density suburban aesthetic and providing options for families wanting extra space. There are approximately 24 people for every dwelling approval in the locality, suggesting a growing market footprint. Future forecasts indicate Seaford Heights will add 585 residents by 2041 based on the most recent quarterly figures from AreaSearch. If current building rates persist, residential supply should easily satisfy incoming demand, creating favorable buying conditions and potentially helping the population expand beyond current projection lines.
Frequently Asked Questions - Development
Development applications around Seaford Heights
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| Lodged | Address | Description | Type | Distance | Status |
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SOURCE: Planning portals and council registers, compiled by AreaSearch. Distance & bearing measured from the suburb midpoint.
AreaSearch tracks 13 current infrastructure and development projects close to Seaford Heights, worth an estimated $2.75 billion. 3 are already under construction and 3 are due for completion within three years. The pipeline spans transport & logistics, retail and sports & recreation. 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 construction, and planning changes have a significant influence on regional performance. No new projects have been identified by AreaSearch that are expected to affect this area. Notable regional projects include Main South Road Duplication Stage 1 - Aldinga Project, Victor Harbor Road Duplication, Sunset Residential Development, and Majors Road Interchange, with details provided on those most likely to be relevant.
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Frequently Asked Questions - Infrastructure
Sunset Residential Development
A 42-hectare master-planned residential community featuring 644 allotments with land sizes up to 540m2. The development includes 15% affordable and social housing outcomes, extensive green spaces including a major north-south walking trail connecting to Onkaparinga River Recreation Park. Located in a prime coastal position with proximity to South Australian beaches and McLaren Vale wine region.
Victor Harbor Road Duplication
Duplication of approximately four kilometres of Victor Harbor Road between Main South Road (Old Noarlunga) and Main Road (McLaren Vale) to improve safety, traffic flow and capacity, including a new four-way, two-lane roundabout at Robinson Road and the realignment of Quarry Road. All lanes are now open to traffic and the project is complete as part of the broader Fleurieu Connections program delivered by the Fleurieu Connections Alliance.
Fleurieu Connections - Main South Road Duplication
Duplication of Main South Road between Sellicks Beach and Victor Harbor, improving safety and reducing travel times to the Fleurieu Peninsula. The project includes new overtaking lanes, intersection upgrades and safety improvements.
Seaford Rail Extension
5.7km extension of dual track rail line from Noarlunga Centre to Seaford District Centre. Includes new railway stations at Seaford Meadows and Seaford with park-and-ride facilities, improving public transport access to southern suburbs.
Majors Road Interchange
The $120 million Majors Road Interchange project, jointly funded by the Australian and South Australian governments, constructed new on and off-ramps for the Southern Expressway at Majors Road. It included widening the Majors Road bridge to six lanes, signalised intersection improvements, and a new 1.8km shared user path. The project improved access to Glenthorne National Park and was officially opened to traffic in October 2025.
Noarlunga Master Planning Housing Project
A 22-hectare master-planned residential development delivering more than 626 new homes across two land parcels on either side of Lovelock Drive in Port Noarlunga and Noarlunga Downs. The project features a minimum of 28% affordable and social housing (including 80 social housing dwellings), and 12.5% new public open space with a target of 25% overall tree canopy. Designed by Holmes Dyer, the development targets a 5-Star Green Star Communities rating. Civil works by Winslow Constructors commenced in 2025, with house construction planned to begin in 2026 and first residents expected by end of 2026.Multiple sales releases are underway including the Wirra and Kauwi Releases. The community will become home to approximately 1,200 residents over a 7-10 year delivery period through to 2031.
Main South Road Duplication Stage 1 - Aldinga Project
Stage 1 of the Main South Road Duplication between Seaford and Aldinga has been completed and is open to traffic. The project duplicated approximately 10 km of Main South Road, improving safety, reducing congestion and supporting tourism and regional growth on the Fleurieu Peninsula. It forms the first stage of the broader Fleurieu Connections program.
Ocean View Estate
An exclusive boutique residential estate in Maslin Beach, offering land for new homes and house and land packages, including the 'Ashford' design with 'Vantage' facade. The estate provides a luxury living experience near the beach and the McLaren Vale wine region, with flat land ready for new homes or holiday escapes. Lot sizes include 702sqm, with pricing starting from $1,090,298 for select packages.
1,591 residents of Seaford Heights are employed, from a labour force of 1,599. Unemployment sits at 0.5%, with participation at 85.6%. Weighted for its industry mix, the area's sectors are forecast to grow about 6.5% nationally over five years. That reflects industry composition only and makes no allowance for local population growth, so in an area growing as fast as this one it understates the likely rise in local jobs. The working-day population is estimated at 1,702, about 70% 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
Seaford Heights features a highly qualified labor pool with strong representation in essential services, an unemployment rate of 0.5%, and estimated employment growth of 17.0% over the previous year according to AreaSearch aggregated statistical area data. By March 2026, the area had 1,591 residents employed, with an unemployment rate of 3.3% that sits 0.5 percentage points lower than Greater Adelaide's 3.8%, and workforce participation reached 85.6% which exceeds Greater Adelaide's 66.6%. Census data indicates that only 9.4% of residents worked from home, although the lingering effects of Covid-19 lockdowns should be taken into account.
The major employment sectors for local workers are health care & social assistance, retail trade, and construction. Retail trade shows a strong local concentration, with its share of employment reaching 1.4 times the regional average. Conversely, professional & technical services are underrepresented, accounting for 3.8% of jobs compared to 7.3% regionally. The area is highly residential and offers few local job opportunities, as shown by the discrepancy between the Census working population and resident counts. Based on SALM and ABS statistics compiled by AreaSearch for the year ending March 2026, local employment grew by 17.0% and the workforce expanded by 16.8%, resulting in a 0.2 percentage point reduction in the unemployment rate. Over the same period, Greater Adelaide saw employment rise by 4.2% and the labor force grow by 4.0%, with its unemployment rate dropping by 0.2 percentage points. National forecasts released by Jobs and Skills Australia in May-25 offer additional context for future labor demand. These five and ten-year projections have been applied to the local workforce structure to estimate future job trends. While total national employment is projected to grow by 6.6% over five years and 13.7% over ten years, the rates of change vary by industry. Projecting these industry trends onto the local work profile suggests Seaford Heights could see employment grow by 6.5% over five years and 13.5% over ten years, assuming a basic weighted extrapolation that does not account for local population changes.
Frequently Asked Questions - Employment
Median household income in Seaford Heights is $2,170 a week (about $113,000 a year), with median personal income at $1,081 a week. ATO records put median taxable income at $68,945 a year against an average of $85,216. 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
Taxpayer data from the ATO compiled by AreaSearch for the 2023 financial year shows that the suburb of Seaford Heights has a very high income profile relative to the rest of the nation. The median taxpayer income is $68,945 and the average stands at $85,216, compared to Greater Adelaide averages of $54,808 and $66,852. Adjusting for a 10.17% increase in the Wage Price Index since the 2023 financial year, current estimates would be approximately $75,957 for the median and $93,882 for the average as of March 2026. Census data places household, family, and individual incomes in the suburb of Seaford Heights between the 76th and 85th percentiles nationally.
In terms of distribution, 51.7% of the community (1,260 people) earn between $1,500 and $2,999, which is higher than the metropolitan rate of 31.8% in the same bracket. High housing costs account for 16.3% of income, but strong wages keep disposable income at the 75th percentile nationally, placing the area in the 6th decile of the SEIFA income index.
Frequently Asked Questions - Income
Seaford Heights had 398 occupied dwellings at the 2021 Census, 95% detached houses and 0% apartments. 67% are owned with a mortgage, 23% rented and 10% owned outright. At that Census the median rent was $380 a week and the median mortgage repayment $1,733 a month, a total housing cost higher than 83% of areas nationally. Rent absorbs 17.5% of household income here and mortgage repayments 18.4%. Dwelling stock, tenure and housing costs are 2021 Census measures — the only source that counts dwellings at this boundary size.
Detail
Residential structures in Seaford Heights at the time of the latest Census consisted of 94.9% standalone houses and 5.1% other options like townhouses and apartments, compared to 75.2% houses and 24.9% other dwellings across metropolitan Adelaide. Home ownership rates in Seaford Heights lagged behind the metropolitan average, sitting at 10.2%, with the remaining properties being mortgaged (67.0%) or rented (22.8%). The median monthly mortgage payment of $1,733 was notably higher than the Adelaide metro average of $1,562, while the median weekly rent of $380 exceeded the metropolitan average of $320.
Nationally, mortgage costs in Seaford Heights are below the Australian average of $1,863, while weekly rents exceed the national benchmark of $375.
Frequently Asked Questions - Housing
Seaford Heights counted 398 households at the 2021 Census, an estimated 899 today, averaging 2.6 people each. 37% are couples with children, against 34% couples without children. 17% of households are people living alone, and families average 1.2 children. Household and family composition is measured only by the Census, so these are 2021 figures.
Detail
Families make up 81.4% of all local households, consisting of couples with children at 37.2%, couples without children at 33.6%, and single parent households at 9.2%. The remaining 18.6% are non-family households, including single person households at 16.8% and group living situations at 1.7%. The median household occupancy of 2.6 residents is slightly higher than the Greater Adelaide average of 2.5.
Frequently Asked Questions - Households
25.0% of adults in Seaford Heights hold a university qualification, including 17.5% with a bachelor degree and 4.7% with postgraduate qualifications, higher than 91% of areas nationally. A further 32.6% hold a vocational qualification. Qualifications come from the 2021 Census.
Detail
The educational profile of the area is distinct, with university attainment rates for residents aged 15 and over sitting at 25.0%, compared to the SA3 average of 18.9%, showing a strong focus on tertiary education. Bachelor degrees are the most common higher qualification at 17.5%, with postgraduate degrees at 4.7% and graduate diplomas at 2.8%. Vocational qualifications are also highly prevalent, with 41.8% of residents aged 15 and over holding technical credentials, consisting of advanced diplomas (9.2%) and certificates (32.6%). Enrolment in formal education is high, with 26.7% of residents actively studying.
This cohort includes 10.4% in primary schools, 5.1% in tertiary institutions, and 4.8% attending secondary schools.
Frequently Asked Questions - Education
Schools Detail
Getting around Seaford Heights means driving: households keep an average of 1.6 vehicles, and scheduled services reach only a handful of stops. Service data is built from operators' published GTFS timetables; vehicle ownership is from the 2021 Census.
Detail
Public transport services in the suburb of Seaford Heights consist of 2 active transit stops offering bus options. These stops are serviced by 4 different routes, providing 145 weekly passenger trips. Transport access is rated as good, with residents living an average of 395 meters from their nearest stop. Because this is a residential suburb, the majority of commuters travel outside the area, with private cars remaining the primary mode of travel at 91%, followed by trains at 7%. Household vehicle ownership averages 1.6 cars, which is higher than the regional average.
A low 9.4% of residents worked from home, according to the 2021 Census, which may have been influenced by COVID-19 restrictions. Service frequency across all local routes averages 20 trips per day, which translates to approximately 72 weekly departures at each individual stop.
Frequently Asked Questions - Transport
Transport Stops Detail
79.0% of residents in Seaford Heights report no long-term health condition. 2.2% need daily assistance with core activities, and 60.6% hold private health cover. The standardised death rate runs at 6.0 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 are positive for Seaford Heights residents, with analysis of mortality rates and chronic illnesses showing results in line with national averages, and normal rates of typical health issues across both younger and older cohorts. Private health insurance coverage is high, with roughly 61% of the population (1,477 residents) holding policies, compared to 52.7% across Greater Adelaide. Asthma and mental health issues are the most frequent medical conditions, affecting 7.8% and 7.5% of residents respectively. Conversely, 79.0% of the population reported no ongoing health issues, which is higher than the 67.9% average across Greater Adelaide.
Working-age residents exhibit strong health profiles with a low incidence of chronic illness. Residents aged 65 and over make up 9.8% of the community (238 people), which is lower than the Greater Adelaide rate of 19.2%, with national health rankings remaining close to the general population.
Frequently Asked Questions - Health
26.6% of Seaford Heights residents were born overseas and 12.3% speak a language other than English at home. The largest reported ancestries are English (36.7%) and Australian (25.6%). Ancestry, language and country of birth are counted only by the Census, so these are 2021 figures.
Detail
Seaford Heights displays a higher level of cultural diversity than average, with 12.3% of residents speaking a non-English language at home and 26.6% born outside Australia. Christianity is the primary religion, followed by 31.4% of the population. The most pronounced overrepresentation is in the Other category, which represents 1.9% of residents, compared to 1.8% across Greater Adelaide. In terms of family ancestry, the three largest groups represented locally are English at 36.7% of the population (exceeding the regional average of 27.8%), Australian at 25.6%, and Other at 6.5%. Other notable ethnic representations include Croatian at 1.0% (compared to 0.5% regionally), Sri Lankan at 0.5% (compared to 0.2%), and Dutch at 1.6% (compared to 1.2%).
Frequently Asked Questions - Diversity
The median resident of Seaford Heights is 31, younger than 98% of areas nationally. That is 2 years older than at the 2021 Census. 36.2% 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
With a median age of 31, the suburb of Seaford Heights has a much younger population than Greater Adelaide where the median is 39, and is also younger than the national median of 38 years. Compared to Greater Adelaide, the suburb of Seaford Heights has a higher proportion of residents aged 25 to 34 (24.1%) but fewer seniors aged 65 to 74 (5.0%). This concentration of 25 to 34 year-olds is significantly higher than the national average of 14.6%. Since the 2021 Census, the median age has risen by 2.0 years, increasing from 29 to 31.
The 55 to 64 age group expanded from 5.2% to 8.0%, and the 75 to 84 cohort grew from 1.1% to 3.0%. Meanwhile, the 25 to 34 age group decreased from 31.2% to 24.1%, and the 45 to 54 group fell from 10.5% to 9.0%. Projections indicate that by 2041 the age structure of the suburb of Seaford Heights will change, with the 25 to 34 age group expected to grow by 141 people (24%), rising from 587 to 729.
Frequently Asked Questions - Age
Data & MethodBoundaries, Sources & Method for Seaford Heights
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 — 393 validated new addresses here. The headline figure is therefore a current estimate for May 2026, not a 2021 count (1,079 at the 2021 Census → 2,438 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 (SAL41316). QuickStats reports 2021 only — the figures on this page are more current wherever the ledger shows a later date.