St Agnes
A 44-year median age, 85.8% separate-house share and 39.7% outright ownership give St Agnes a settled, owner-occupier profile. Its median age is 4.0 years above the national figure, while 24.7% of residents were born overseas and population density reaches 1,627.6 people per square kilometre across 2.6 square kilometres. For households comparing St Agnes with nearby Modbury or Ridgehaven, the suburb suits buyers seeking established detached housing rather than a high-turnover rental market, with only 17.0% of homes rented and 82.2% of residents staying at the same address.
Population
4,233
Median Age
44.0
Household IncomeiMedian weekly household income (ABS Census)
$1,557/wk
DAs (12 months)iDevelopment Applications lodged in the past year
53
Median House
$845K
First quarter 2026
St Agnes is primarily a detached-home market, with separate houses accounting for 85.8% of dwellings and 3-bedroom homes representing 62.0%. That rise makes entry more demanding than a year earlier, although the typical monthly mortgage figure is $1,500 and mortgage costs equal 22.2% of household income without a mortgage-stress flag. Compared with apartment-oriented locations, St Agnes gives buyers more access to 3-bedroom and 4-plus-bedroom stock, but the trade-off is a higher upfront purchase price.
For Buyers
St Agnes is primarily a detached-home market, with separate houses accounting for 85.8% of dwellings and 3-bedroom homes representing 62.0%. That rise makes entry more demanding than a year earlier, although the typical monthly mortgage figure is $1,500 and mortgage costs equal 22.2% of household income without a mortgage-stress flag. Compared with apartment-oriented locations, St Agnes gives buyers more access to 3-bedroom and 4-plus-bedroom stock, but the trade-off is a higher upfront purchase price.
For Investors
The rental profile is relatively small, with 17.0% of dwellings rented compared with 42.3% under mortgage, so the suburb is more owner-occupier focused than a typical high-rental precinct. Weekly rent is $340 and vacancy is 4.3%, while rents have grown 26.9%, supporting income potential but not removing leasing risk. Overseas migration is the primary growth driver, which may broaden tenant demand, and 51 development applications were recorded over 12 months. Investors should distinguish between housing, commercial and service-related applications because the pipeline is not limited to new dwellings. The current gentrification score is 0, with a status of Not gentrifying, so the case rests more on established demand than on a rapid transformation story.
Development Activity
Total DAs
247
Last 12 Months
53
YoY ChangeiYear-over-year change in DA lodgements
+60.6%
Avg DA CostiAverage estimated cost per DA in the past year
N/A
Monthly DA Lodgements
DA Categories
Schools in St Agnes
Open-register school locations for education access. This is not a school-quality ranking.
Ardtornish Primary School
St Agnes School P-6
Demographics
St Agnes has a median age of 44, or 4.0 years above the national comparison, and its average household size of 2.4 is 0.1 below the national figure. The university-educated share is 30.4%, only 0.3 percentage points above national, while the overseas-born share is 24.7%, 3.1 percentage points above national. English ancestry is recorded for 1,755 residents, followed by German at 405, Italian at 377 and Scottish at 363. No religion is the largest reported affiliation at 1,966 people, compared with 1,819 identifying with Christianity. The 82.2% address-stability rate supports the suburb's aging trajectory because longer-term residents often reinforce established household and local-service patterns.
Age Distribution
Bedrooms
Dwelling Structure
85.8%
Houses
4.1%
Townhouse
10.2%
Apartment
Tenure
Housing in St Agnes is weighted toward conventional family stock: 62.0% of homes have 3 bedrooms, 24.9% have 4 or more, and 85.8% are separate houses. Tenure is split between 39.7% owned outright, 42.3% mortgaged and 17.0% rented, meaning mortgage holders form the largest group and are higher than outright owners by 2.6 percentage points. A $1,500 monthly mortgage and a 22.2% mortgage-to-income ratio indicate manageable typical costs, with no mortgage-stress flag. Compared with smaller-unit markets, St Agnes offers more detached and larger-bedroom supply but requires greater capital.
Mortgage / mo
$1,500
Rent / wkiABS Census 2021 median across all dwelling types. Current market rents are typically higher.
$340
Census 2021
HH Size
2.4
Personal Income / wk
$746
Vacancy Ratei% of dwellings unoccupied on Census night (ABS 2021)
4.3%
Unoccupied
75
Rent / IncomeiMedian rent as % of household income. Over 30% = housing stress
21.8%
Mortgage / IncomeiMedian mortgage as % of household income. Over 30% = housing stress
22.2%
Community Profile
Languages Spoken at Home
Ancestry
Household Composition
40.5%
Couples with children
41.9%
Couples, no children
16.6%
Single parent
1,202
Total families
Economy & Employment
Healthcare is St Agnes's largest listed industry at 20.3% and 284 workers, followed by education at 12.6% and 177, public administration at 9.9% and 139, construction at 8.2% and 115, and manufacturing at 7.7% and 108. The labour force totals 2,141 people, with a 3.8% unemployment rate and 60.6% participation rate; 1,224 workers are full time and 728 part time. Occupations are led by professionals at 441, clerical and administrative workers at 343, and trades at 326. SEIFA results sit near the middle, with IEO and IRSAD at decile 5 and IER and IRSD at decile 6. This one-decile spread means St Agnes ranks neither strongly above nor below the socioeconomic midpoint, despite a broad mix of professional, administrative and trade employment.
Unemployment
3.8%
Labour Force
2,141
Unemployed
81
Source: ABS Census 2021
Socio-Economic Indexes (SEIFA)iABS index ranking suburbs from 1 (most disadvantaged) to 10 (most advantaged)
Full-time
59.4%
Part-time
35.3%
Participation
60.6%
Employed
2,060
Full-time and part-time are shares of the employed. Source: ABS Census 2021
Occupations
Top Industries
University
30.4%
Postgraduate
6.2%
Born Overseas
24.7%
Dwellings
1,653
Transport to Work
St Agnes has practical local access for families, with 2 government primary schools serving the suburb: Ardtornish Primary School and St Agnes School P-6. Exact enrolment zones should be checked against the address because school boundaries can cross suburb lines. Daily travel is strongly car oriented, with 75.4% driving and 7.5% using public transport, while 2.2% walk or cycle and 11.6% work from home. Car use is therefore higher than public transport use by 67.9 percentage points. Recorded crime totals 234 incidents, equivalent to 55.3 per 1,000 residents, so household safety decisions should consider the exact street and property conditions. The IRSAD score sits at decile 5, placing local advantage near the middle rather than above the highest socioeconomic areas, while density is 1,627.6 people per square kilometre.
Drive
75.4%
Public Transport
7.5%
Walk / Cycle
2.2%
Work from Home
11.6%
Population Forecast
+0.51%/yr
(+69 people/yr)
EstablishedSt Agnes has an established growth profile, with the annual trend running at 0.51% and overseas migration identified as the primary driver. Population change across the wider area is 8.3% over 10 years, which is above zero but consistent with gradual rather than rapid expansion. The trajectory is Aging: the senior share has increased by 4.8 percentage points, while the working share has fallen 2.6 points and the young share has declined 0.3 points. Rent growth of 26.9% adds pressure for tenants as demand changes. Compared with a fast-growing development corridor, the 0.51% annual pace suggests steadier change. The current gentrification status is Not gentrifying with a score of 0, although the longer shift indicator records 24 and Early signs.
Historical + Forecast
Hamilton-Perry + Holt smoothing on ERP 2001-2025
Age Cohort Forecast
Primary Driver
Overseas Migration
Net Overseas / yr
+83
Net Internal / yr
+14
Gentrification Signal
Not gentrifying
Safety & Crime
Total Offences
234
Year ending June 2024
Rate per 1,000 People
55.3
Source: Crime Statistics Agency Victoria / SA Police
National Ranking iPercentile rank among ~15,000 AU suburbs. 90% = higher than 90% of suburbs
How St Agnes compares to ~15,000 Australian suburbs
Frequently Asked Questions
Is St Agnes a good suburb to live in?
St Agnes may suit households wanting established detached housing, with 85.8% of dwellings separate houses and 62.0% containing 3 bedrooms. Its median age is 44, public transport use is 7.5%, and 2 government primary schools are local options. The suburb is more car dependent than transit oriented.
What schools are in St Agnes?
St Agnes has 2 government primary schools: Ardtornish Primary School and St Agnes School P-6. Both provide primary education. Families should confirm the enrolment zone for the exact property because school boundaries may differ from suburb boundaries.
Is St Agnes safe?
St Agnes recorded 234 total crimes, equivalent to 55.3 incidents per 1,000 residents. That figure should be considered alongside the exact street, dwelling security and time of day. Safety perceptions can vary locally, so buyers and renters should inspect the immediate surroundings before committing.
Is St Agnes good for property investment?
St Agnes has 17.0% rented dwellings, a $340 weekly rent and a 4.3% vacancy rate. Rents have grown 26.9%, while 51 development applications were recorded over 12 months. The owner-occupier base is stronger than the rental base, so investors should assess tenant demand and the type of nearby development.
How is St Agnes's population changing?
The suburb has 4,233 residents today. Growth across the wider area is forecast at 0.51% annually, with overseas migration the primary driver and population change of 8.3% over 10 years. The trajectory is Aging, with the senior share up 4.8 percentage points and the working share down 2.6 points.
What development is occurring in St Agnes?
There were 51 development applications in the latest 12 months. The recorded mix includes a single-storey detached dwelling, a service depot with storage and offices, and an optical superstore fitout. This indicates ongoing property and commercial activity, but the applications do not represent 51 new homes.
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). Population forecasts use a Hamilton-Perry cohort model calibrated to ABS ERP.
Explore St Agnes on the Map
View parcels, zoning overlays, DA applications, schools and more.
Open Interactive Map