Seacliff Park
The suburb's 2,644 residents are slightly older than the national average at a median age of 41, and 37.8% hold university qualifications, which is 7.7 percentage points above the national figure. Household income sits at the 59.4th percentile nationally, a middle-upper positioning that aligns with the owner-occupier dominance: 37.6% own outright and a further 41.3% hold a mortgage, leaving only 21.1% renting.
Local council: Marion (71% of the suburb; the rest sits in a neighbouring council)
Population
2,644
Median Age
41.0
Household IncomeiMedian weekly household income (ABS Census)
$1,693/wk
DAs (12 months)iDevelopment Applications lodged in the past year
45
Median House
$1.0M
First quarter 2026
Separate houses make up 83.9% of all dwellings, with three-bedroom homes the most common at 54.3% of the stock. Four-bedroom-plus homes account for 28.9%, reflecting a family-oriented composition. Semi-detached dwellings cover 13.0% of the market and apartments just 3.1%, so buyers seeking a house face a deep but competitive pool against other owner-occupiers.
For Buyers
Separate houses make up 83.9% of all dwellings, with three-bedroom homes the most common at 54.3% of the stock. Four-bedroom-plus homes account for 28.9%, reflecting a family-oriented composition. Semi-detached dwellings cover 13.0% of the market and apartments just 3.1%, so buyers seeking a house face a deep but competitive pool against other owner-occupiers.
For Investors
Rental demand in Seacliff Park is relatively contained: only 21.1% of residents rent, lower than many comparable coastal suburbs, and the vacancy rate of 5.9% is on the higher side, which can put downward pressure on asking rents. On the development side, 30 applications were lodged in the past 12 months, including ancillary accommodation and pool installations, consistent with owners improving existing stock rather than adding new rental supply. The suburb's stability score reinforces the long-hold profile: 81.7% of residents stayed in the same address over the census period, signalling very low turnover and limited churn in the rental pool.
Development Activity
Total DAs
295
Last 12 Months
45
YoY ChangeiYear-over-year change in DA lodgements
-10.0%
Avg DA CostiAverage estimated cost per DA in the past year
N/A
Monthly DA Lodgements
DA Categories
Demographics
The median age of 41 sits 1.0 year above the national figure, reflecting a settled owner-occupier community. University qualifications reach 37.8%, which is 7.7 percentage points above the national average, consistent with the professional and managerial occupation mix. Overseas-born residents account for 26.5% of the population, 4.9 percentage points above national. Ancestry is predominantly English (1,154 residents), followed by Scottish (282), Irish (236) and German (218). Average household size is 2.4, marginally below national, and 28.5% of families are couples without children. The volunteering rate is 17.6%, indicating a reasonably engaged local population, and only 5.2% of residents (132 people) need daily assistance.
Age Distribution
Bedrooms
Dwelling Structure
83.9%
Houses
13.0%
Townhouse
3.1%
Apartment
Tenure
Tenure is dominated by owners: 37.6% hold their home outright and 41.3% carry a mortgage, so fewer than a quarter of all households are renting. This ownership depth reflects the long-tenured profile, with 81.7% of residents remaining at the same address. Separate houses account for 83.9% of dwellings, well above state and national norms for a suburban area of this density. Three-bedroom homes are most common at 54.3%, followed by four-plus bedroom at 28.9%, suggesting most households have growing or grown families. Rent-to-income sits at 21.9%, below the 30% stress threshold, keeping the rental market manageable for tenants.
Mortgage / mo
$1,800
Rent / wkiABS Census 2021 median across all dwelling types. Current market rents are typically higher.
$370
Census 2021
HH Size
2.4
Personal Income / wk
$856
Vacancy Ratei% of dwellings unoccupied on Census night (ABS 2021)
5.9%
Unoccupied
65
Rent / IncomeiMedian rent as % of household income. Over 30% = housing stress
21.9%
Mortgage / IncomeiMedian mortgage as % of household income. Over 30% = housing stress
24.6%
Community Profile
Languages Spoken at Home
Ancestry
Household Composition
42.7%
Couples with children
40.0%
Couples, no children
16.2%
Single parent
742
Total families
Economy & Employment
Healthcare is the dominant employing industry at 23.5% of workers (236 people), well above the typical suburban share and consistent with proximity to major SA health infrastructure. Education accounts for 12.4% (125 workers) and Construction for 12.1% (122 workers). Public Admin employs 9.1% and Professional/Tech services 8.0%. By occupation, Professionals are the largest group at 362 workers, followed by Managers at 202 and Community/Personal services at 177, a pattern that explains why 37.8% of residents hold university qualifications, above the national average. Employment conditions are moderate: the full-time employment rate is 61.1%, participation is 62.0% and unemployment sits at 4.7%. Household income at the 59.4th percentile nationally is solid without being exceptional.
Unemployment
4.5%
Labour Force
1,434
Unemployed
64
Source: ABS Census 2021
Socio-Economic Indexes (SEIFA)iABS index ranking suburbs from 1 (most disadvantaged) to 10 (most advantaged)
Full-time
57.6%
Part-time
36.6%
Participation
65.6%
Employed
1,370
Full-time and part-time are shares of the employed. Source: ABS Census 2021
Occupations
Top Industries
University
37.8%
Postgraduate
9.9%
Born Overseas
26.5%
Dwellings
1,040
Transport to Work
Private car use is dominant at 88.7% of journeys to work, with public transport used by only 5.4% of commuters and walking or cycling at 1.9%. This is expected for a low-density coastal suburb without a heavy rail station on its boundary. No schools are recorded inside the suburb boundary in this dataset, so families draw on institutions in adjacent postcodes. Crime totalled 97 incidents in the reference period, equivalent to a rate of 36.7 per 1,000 residents. Housing stress is low: mortgage-to-income at 24.6% and rent-to-income at 21.9% both sit below the 30% threshold used to define stress. The suburb's 2.29 km2 area at a density of 1,155 residents per km2 keeps it spacious relative to inner Adelaide, and 83.9% detached housing underpins the quiet residential character.
Drive
78.1%
Public Transport
4.7%
Walk / Cycle
1.7%
Work from Home
11.9%
Growth Outlook
The suburb recorded 30 development applications in the past 12 months, dominated by performance-assessed improvements rather than new dwelling additions, indicating residents are upgrading in place rather than subdividing. The 5.9% vacancy rate is elevated relative to tightly-held coastal areas, which moderates expectations for near-term price recovery compared to lower-vacancy neighbours.
Population trend: Marion council area
About 71% of Seacliff Park sits in Marion; the rest is in a neighbouring council. These are the council area's residents, not Seacliff Park's.
Residents 2025
101,229
Growth, 5 yr average
+1.2%/yr
2020 to 2025
Growth, last year
+1.2%
2024 to 2025
ABS Estimated Resident Population by LGA, 30 June each year; council area, not this suburb
Safety & Crime
Total Offences
97
Year ending June 2024
Rate per 1,000 People
36.7
Source: Crime Statistics Agency Victoria / SA Police
National Ranking iPercentile rank among ~15,000 AU suburbs. 90% = higher than 90% of suburbs
How Seacliff Park compares to ~15,000 Australian suburbs
Frequently Asked Questions
Is Seacliff Park a good suburb to live in?
Seacliff Park offers a stable, owner-dominated residential environment with 37.6% of households owning outright and a further 41.3% on mortgages. University qualifications at 37.8% are 7.7 points above the national figure. Housing stress is low, with mortgage-to-income at 24.6% and rent-to-income at 21.9%, both well below the 30% stress threshold.
What schools are in Seacliff Park?
No schools are recorded inside the Seacliff Park suburb boundary in this dataset, so families access schools in surrounding suburbs. The local population is well-educated, with 37.8% of residents holding university qualifications, which is 7.7 percentage points above the national average.
Is Seacliff Park safe?
Seacliff Park recorded 97 total crime incidents in the reference period, equating to a rate of 36.7 per 1,000 residents. Housing stress indicators are low, with only 5.2% of the 2,644 residents needing daily assistance, and 81.7% of residents stayed at the same address over the census period, reflecting long-term residential stability.
How is Seacliff Park's population changing?
Seacliff Park has a settled, low-turnover population of 2,644, with 81.7% of residents remaining at the same address over the census reference period and a turnover rate of only 18.3%. The median age of 41 is 1.0 year above the national figure, and the dominant household type is couples with children (894 families), consistent with a mature, family-oriented suburb.
How much development is happening in Seacliff Park?
There were 30 development applications lodged in Seacliff Park in the past 12 months. Recent approvals include ancillary accommodation (granny flat), swimming pools and fencing works. Most activity is performance-assessed improvement of existing homes rather than new dwelling construction, consistent with a suburb where 83.9% of stock is already detached housing.
How to read these comparisons
Phrases like "above the national average" reference the unweighted median across Australian suburbs with more than 1,000 residents, not population-weighted national figures. Suburb-level medians are more useful for ranking suburbs against each other; ABS census headlines are population-weighted (so dominated by Sydney and Melbourne) and can read very differently.
Current baseline (refreshed 2026-05-10): median age 40, university-educated 30.1%, born overseas 21.6%, average household size 2.5 people.
Data sources: ABS 2021 Census (demographics, income, tenure), SA Department for Housing and Urban Development (house prices), state education open registers (school locations), state Crime Statistics agencies (offences), council DA portals (development applications).
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