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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 2,439 residents, up from 1,079 at the 2021 Census — a change of 1,360 people, or 126.0%. 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 1,410 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
Demographic assessments by AreaSearch combining regional ABS releases and 393 validated new addresses post-Census place the population of the suburb of Seaford Heights at roughly 2,439 as of Aug 2026. This represents an addition of 1,360 people (126.0%) above the 1,079 people recorded in the 2021 Census, building on the ERP benchmark of 2,401 determined in June 2025. Consequently, the suburb of Seaford Heights exhibits a population density of 1,409 persons per square kilometer, outpacing national averages evaluated by AreaSearch. Its 126.0% expansion since the 2021 census significantly outstripped both the broader SA3 area (6.0%) and the wider SA4 region, positioning the locality at the forefront of regional growth.
Net gains were predominantly underpinned by interstate migration, accounting for about 81.0% of recent inflows, though natural growth and overseas arrivals also delivered positive contributions. Long-term outlooks for the suburb of Seaford Heights incorporate 2024 ABS/Geoscience Australia SA2 projections based on 2022 benchmarks, supplemented beyond post-2032 and for unmapped areas by 2023 SA State Government age-cohort figures derived from 2021 numbers via weighted LGA-to-SA2 growth aggregation. Under these demographic expectations, the suburb of Seaford Heights ranks in the top quartile of statistical areas across the nation, with aggregated SA2 modeling pointing to an expansion of 585 persons by 2041, representing a cumulative 22.4% rise over the 16 years.
Frequently Asked Questions - Population
519 new dwellings have been approved in Seaford Heights over the past five years, an average of 103 a year. That places the area in the 97th percentile for residential development activity nationally, about 42 approvals per 1,000 residents a year. Of the 82 dwellings approved in the latest reporting year, 93% were detached houses and the rest townhouses or apartments. Approvals are currently running at an annualised 72, 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
ABS building approval statistics analyzed by AreaSearch indicate that Seaford Heights registered roughly 103 residential approvals annually, delivering a total of 519 homes across the last 5 financial years, alongside 72 approvals logged to date in FY-25. With approximately 3.8 new residents added per finished dwelling across the past 5 financial years (between FY-21 and FY-25), building activity has trailed local demand, creating strong buyer competition and upward value pressure on residential projects averaging an expected construction cost of $410,000. Non-residential activity remains modest, with $2.7 million in commercial development approvals recorded this financial year, underscoring the dominant residential focus.
Per capita residential construction in Seaford Heights surpasses Greater Adelaide by 845.0%, providing prospective purchasers with broader selection while underscoring elevated developer appetite relative to the national benchmark. Low-density detached houses comprise 93.0% of recent building activity with attached dwellings making up the remaining 7.0%, reinforcing a suburban profile tailored to households seeking larger family footprints. In addition, the current ratio of approximately 22 people per dwelling approval reflects a steadily expanding property pipeline. According to the most recent quarterly projections from AreaSearch, Seaford Heights is slated to absorb 547 residents by 2041. Present construction volume indicates that upcoming residential supply will comfortably accommodate this inward migration, establishing favourable purchasing conditions and potentially enabling demographic expansion beyond prevailing baseline forecasts.
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 capital expenditure, planning projects, and civic upgrades play a foundational role in shaping neighborhood performance. While no major initiatives have been formally logged by AreaSearch as directly impacting the immediate boundary, notable surrounding regional works include the Main South Road Duplication Stage 1 - Aldinga Project, the Victor Harbor Road Duplication, the Majors Road Interchange, and the Sunset Residential Development.
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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.
1,571 residents of Seaford Heights are employed, from a labour force of 1,579. Unemployment sits at 0.5%, with participation at 84.3%. 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 1,713, 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
Workforce metrics compiled from statistical area releases by AreaSearch highlight a resilient local labor market, characterized by strong representation across essential services, an unemployment rate of only 0.5%, and annual job growth of 16.8%. As of March 2026, employed residents numbered 1,571, the jobless rate tracked 3.3% lower than the Greater Adelaide figure of 3.8%, and the participation rate reached an elevated 84.3% against 66.4% across Greater Adelaide. Working from home was recorded among only 9.4% of residents at the Census, although historical Covid-19 restrictions should be factored into this baseline.
Local workers are primarily concentrated within health care & social assistance, retail trade, and construction. Retail trade represents an especially prominent employer, capturing resident participation at 1.4 times the regional rate. Conversely, professional & technical roles account for only 3.8% of the local workforce, compared to 7.3% across Greater Adelaide. Comparing Census working population tallies against resident counts highlights that this primarily suburban setting provides relatively few local commercial jobs. AreaSearch evaluations of ABS and SALM series for the year ending March 2026 show local employment grew by 16.8% alongside a 16.6% increase in the labor pool, reducing the unemployment rate by 0.2 percentage points. Across Greater Adelaide, employment increased by 4.2% and the labor force expanded by 4.0%, also yielding an unemployment reduction of 0.2 percentage points. Aligning local industry distributions against national Jobs and Skills Australia projections from Mar-26—which forecast economy-wide expansions of 6.6% over five years and 13.7% over ten years—suggests local workforce growth of 6.5% over five years and 13.5% over ten years (calculated as an illustrative weighted extrapolation without factoring in localized 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
ATO taxation data compiled by AreaSearch for financial year 2023 demonstrates that income levels in the suburb of Seaford Heights place it among the highest-earning areas nationally. Taxpayers in the suburb of Seaford Heights generated a median income of $68,945 and an average income of $85,216, outpacing the Greater Adelaide benchmarks of $54,808 and $66,852. Factoring in a Wage Price Index rise of 10.17% since financial year 2023 elevates estimated local benchmarks to approximately $75,957 for median earnings and $93,882 on average as of March 2026. Figures from the 2021 Census place local personal, family, and household earnings between the 76th and 85th percentiles across Australia.
Among individual cohorts, the $1,500 - 2,999 weekly tier accounts for 51.7% of residents (1,260 people), mirroring the regional pattern where this band represents 31.8%. Although housing commitments absorb 16.3% of income, strong earnings position disposable income at the 75th percentile, with the locality ranking in the 6th decile on 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
Dwelling structure within Seaford Heights, as evaluated at the latest Census, comprised 94.9% houses and 5.1% other dwellings (semi-detached, apartments, 'other' dwellings), in comparison to Adelaide metro's 75.2% houses and 24.9% other dwellings. Meanwhile, the level of home ownership within Seaford Heights was lagging that of Adelaide metro, at 10.2%, with the remainder of dwellings either mortgaged (67.0%) or rented (22.8%). The median monthly mortgage repayment in the area was well above the Adelaide metro average at $1,733, while the median weekly rent figure was recorded at $380, compared to Adelaide metro's $1,562 and $320.
Nationally, Seaford Heights's mortgage repayments are lower than the Australian average of $1,863, while rents are exceeding the national figure of $375.
Frequently Asked Questions - Housing
Seaford Heights counted 398 households at the 2021 Census, an estimated 900 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
Family households constitute 81.4% of total local dwellings, comprising couples with children at 37.2%, couples without children at 33.6%, and single parent families at 9.2%. Non-family living arrangements account for the remaining 18.6%, dominated by lone person households at 16.8% and group households at 1.7%. The local median household size of 2.6 people slightly exceeds the Greater Adelaide benchmark 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
Higher education attainments in the area exceed wider regional levels, with 25.0% of residents aged 15+ possessing university credentials compared to the SA3 average of 18.9%. Bachelor degrees represent the most widespread tertiary qualification at 17.5%, alongside postgraduate qualifications at 4.7% and graduate diplomas at 2.8%. Vocational education also forms a substantial component of the local profile, with 41.8% of residents aged 15+ holding technical qualifications, split between certificates at 32.6% and advanced diplomas at 9.2%. Formal academic engagement remains robust across the community, with 26.7% of residents actively undertaking studies.
This cohort comprises 10.4% attending primary education, 5.1% enrolled in tertiary education, and 4.8% participating in secondary education.
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 transit networks in Seaford Heights comprise 2 active transport stops served exclusively by buses across 4 separate routes, generating 145 weekly passenger trips. Local transit connectivity is rated as good, with residents averaging a distance of 395 meters to their nearest stop. Given the suburb's residential focus, outward travel is customary, with private vehicles serving as the primary mode of travel for 91% of commuters and trains capturing 7%. Household vehicle availability stands above the regional standard at an average of 1.6 per dwelling, while 9.4% of workers operated from home at the 2021 Census under prevailing pandemic conditions.
Transit services operate at an average rate of 20 trips per day across the network, providing roughly 72 weekly departures per 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 compiled by AreaSearch show that Seaford Heights records favorable outcomes, with local disease incidence and mortality aligning closely with standard national benchmarks across younger and older demographics alike. Private health insurance coverage is notably widespread, held by approximately 61% of residents (1,478 people) compared to 52.7% across Greater Adelaide. Asthma and mental health issues represent the two most common reported medical conditions, affecting 7.8 and 7.5% of the local population respectively, while 79.0% of residents reported having no diagnosed long-term health ailments, compared to 67.9% across Greater Adelaide.
The working-age cohort displays minimal chronic illness, while residents aged 65 and over account for 9.6% of the population (234 people)—below the Greater Adelaide share of 19.1%—maintaining health outcomes consistent with broader national trends.
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
Cultural measures show Seaford Heights registers above-average diversity, with 26.6% of residents born abroad and 12.3% using a language other than English in their households. Christianity forms the dominant religious identification, comprising 31.4% of the population. The most pronounced local overrepresentation appears in the Other religious category, which stands at 1.9% locally compared to 1.8% across Greater Adelaide. Evaluating parental country of birth reveals English ancestry as the leading background in Seaford Heights at 36.7%, notably exceeding the regional proportion of 27.8%, followed by Australian ancestry at 25.6% and Other origins at 6.5%.
Notable positive differences are also evident among several specific ancestries, including Croatian at 1.0% (against 0.5% across the region), Dutch at 1.6% (against 1.2%), and Sri Lankan at 0.5% (against 0.2%).
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. 37.1% 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 suburb of Seaford Heights displays a distinct concentration of young families, with August 2026 estimates indicating that 39.7% of residents fall into the young to middle aged adults category (25 - 44), compared to 28.9% in Greater Adelaide, whereas retiree and elderly cohorts (65+) represent 9.6% locally against 19.1% regionally. As at August 2026, the estimated median age is 31, rising from 29 at the 2021 Census, while tracking 8 years lower than the Greater Adelaide median of 39 and beneath the national median of 38 recorded at that Census.
Since the Census, the proportion of young to middle aged adults has reduced from 45.0% to an estimated 39.7%. By 2041, the largest numerical gain is anticipated among young to middle aged adults with an addition of 216 residents (22%) to 1,184, while the fastest growth rate will occur in retiree and elderly cohorts, expanding 30% to 304.
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 Oct 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) | Aug 2026 2 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 Aug 2026, with the 2021 Census supplying the small-area baseline. | ||
| Age profile | ABS, Geoscience Australia, State governments Annual | Aug 2026 2 months ago headline measures · 2021 Census baseline |
| Age cohorts are re-based to the latest ABS population estimates and state projections, current to Aug 2026. Each cohort is held as a Census baseline and a current estimate. | ||
| Development & approvals | ABS, GNAF Monthly (ABS approvals) | Aug 2026 2 months ago headline measures · Jul 2026 baseline |
| Property sales & rents | Valuer General, Rental Board, ABS Weekly sales, quarterly rents | Oct 2026 this month headline measures · Sep 2026 baseline |
| 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 Oct 2026. | ||
| Infrastructure projects | Infrastructure Australia, Local governments Daily | May 2026 5 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 7 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) | Sep 2026 last month headline measures · 2021 Census baseline |
| Transport | ABS, State Transport Departments Each timetable release | Jul 2026 3 months ago headline measures · 2021 Census baseline |
| Services & amenities | Provider directories, ACECQA Continuous | Sep 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 Aug 2026, not a 2021 count (1,079 at the 2021 Census → 2,439 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 Aug 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.