Trinity Gardens
At just 0.6 square kilometres, Trinity Gardens packs a median house price of $1,606,300 into one of Adelaide's smallest and most sought-after pockets, placing household income at the 75th percentile nationally. More than half of all residents hold a university qualification, which is 23.8 percentage points above the national figure, and the suburb skews heavily toward outright home ownership at 42.5%, compared to an ownership-with-mortgage share of 30.7%. These two signals together, high education and high outright ownership, point to an established professional base that has held wealth across generations rather than a suburb built on speculative turnover.
Population
1,264
Median Age
40.0
Household IncomeiMedian weekly household income (ABS Census)
$2,006/wk
DAs (12 months)iDevelopment Applications lodged in the past year
2
Median House
$1.6M
Median 1Q 2026
The median house price reached $1,606,300 in the first quarter of 2026, easing from $1,650,000 a year earlier, a decline of 2.6%. Separate houses dominate at 77.1% of dwellings, with semi-detached homes at 12.8% and apartments at just 10.1%. The bedroom mix is skewed to family-sized stock: 49.5% of homes have three bedrooms and 28.0% have four or more, which means smaller or entry-level properties are scarce compared to the state average. Monthly mortgage repayments average $2,184, producing a mortgage-to-income ratio of 25.1%, comfortably below the 30% stress threshold. That ratio is lower than you might expect for a suburb at this price point, because household incomes here rank in the 75th percentile nationally.
For Buyers
The median house price reached $1,606,300 in the first quarter of 2026, easing from $1,650,000 a year earlier, a decline of 2.6%. Separate houses dominate at 77.1% of dwellings, with semi-detached homes at 12.8% and apartments at just 10.1%. The bedroom mix is skewed to family-sized stock: 49.5% of homes have three bedrooms and 28.0% have four or more, which means smaller or entry-level properties are scarce compared to the state average. Monthly mortgage repayments average $2,184, producing a mortgage-to-income ratio of 25.1%, comfortably below the 30% stress threshold. That ratio is lower than you might expect for a suburb at this price point, because household incomes here rank in the 75th percentile nationally.
For Investors
With 26.8% of residents renting and weekly rent at $375, Trinity Gardens offers a landlord market that runs on quality tenant demand rather than volume. Against a $1,606,300 median, that rent implies a gross yield near 1.2%, so the investment case rests firmly on capital preservation and long-run price appreciation rather than cash flow. The vacancy rate is 6.0%, elevated compared to tight Adelaide suburban norms, which suggests the rental segment has some slack. Only 1 development application was lodged in the past 12 months, consistent with a suburb where infill opportunity is constrained by its 0.6 square kilometre area. Demand is underpinned by the professional household base, with 76.6% of residents remaining in place year to year, well above typical urban turnover.
Development Activity
Total DAs
19
Last 12 Months
2
YoY ChangeiYear-over-year change in DA lodgements
+100.0%
Avg DA CostiAverage estimated cost per DA in the past year
N/A
Monthly DA Lodgements
DA Categories
Schools in Trinity Gardens iICSEA: school advantage index. 1000 = national avg, higher = more advantaged
Trinity Gardens School
U, R-6 · 695 students
Demographics
The median age of 40 matches the national figure exactly, making Trinity Gardens unusual for a premium suburb, which typically skews older. University qualifications reach 53.9% of residents, a full 23.8 percentage points above the national figure, reflecting a deep professional class. Overseas-born residents account for 28.3% of the population, 6.7 points above the national average. Ancestry is led by English (371) and Italian (317), with Chinese (127) and Irish (118) also prominent. The average household size of 2.6 is marginally above the national average of 2.5, and 41.6% of families are couples with children, indicating a suburb that functions as a long-term family settlement rather than a transient professional way-station.
Age Distribution
Bedrooms
Dwelling Structure
77.1%
Houses
12.8%
Townhouse
10.1%
Apartment
Tenure
Ownership patterns are a standout: 42.5% of dwellings are owned outright, compared to 30.7% with a mortgage and 26.8% renting. The outright-owned share is well above typical suburban levels, signalling that much of the stock sits with debt-free long-term holders rather than recent purchasers. The housing type split leans strongly toward separate houses at 77.1%, with semi-detached at 12.8% and apartments at only 10.1%. Prices declined 2.6% from $1,650,000 in the first quarter of 2025 to $1,606,300 in the first quarter of 2026. Rent-to-income sits at 18.7%, comfortably below the 30% stress mark, suggesting renters here face less pressure than in comparable premium suburbs of other capital cities.
Median House Price Trend
Source: State Valuer-General
Mortgage / mo
$2,184
Rent / wk
$375
HH Size
2.6
Personal Income / wk
$923
Vacancy Ratei% of dwellings unoccupied on Census night (ABS 2021)
6.0%
Unoccupied
31
Rent / IncomeiMedian rent as % of household income. Over 30% = housing stress
18.7%
Mortgage / IncomeiMedian mortgage as % of household income. Over 30% = housing stress
25.1%
Community Profile
Languages Spoken at Home
Ancestry
Household Composition
22.8%
Couples, no children
1,053
Total families
Economy & Employment
Healthcare is the dominant industry, employing 21.0% of the local workforce, followed by Education at 15.7% and Professional and Technical services at 14.1%, together accounting for more than half of all jobs. This concentration in knowledge-intensive, publicly funded sectors explains both the high university qualification rate and the relative stability of household incomes. By occupation, Professionals number 247 and Managers 99, making up the two largest groups. Unemployment sits at 3.4%, below most metropolitan averages, and the participation rate is 67.0%. Full-time employment accounts for 56.7% of the working-age base, consistent with a professional household profile rather than a casual or part-time workforce.
Socio-Economic Indexes (SEIFA)iABS index ranking suburbs from 1 (most disadvantaged) to 10 (most advantaged)
Full-time
56.7%
Part-time
39.9%
Participation
67.0%
Employed
675
Occupations
Top Industries
University
53.9%
Postgraduate
13.1%
Born Overseas
28.3%
Dwellings
484
Transport to Work
Car dependence is the norm, with 79.2% of residents commuting by car, while 7.8% walk or cycle, higher than many Adelaide suburbs and consistent with the compact 0.6 square kilometre layout. Public transport accounts for 6.3% of commutes. No schools are recorded within the suburb boundary in this dataset, so families rely on nearby institutions in surrounding postcode 5068 suburbs. The crime rate registers 67.2 incidents per 1,000 residents across 85 total recorded offences, a metric best interpreted in the context of the suburb's small population of 1,264. Volunteering runs at 17.7% and only 4.2% of residents need daily assistance, both consistent with a well-resourced, socially engaged community. Rent-to-income at 18.7% keeps tenant households well below financial stress.
Drive
79.2%
Public Transport
6.3%
Walk / Cycle
7.8%
Work from Home
N/A
Safety & Crime
Total Offences
85
Year ending June 2024
Rate per 1,000 People
67.2
Source: Crime Statistics Agency Victoria / SA Police
National Ranking iPercentile rank among ~15,000 AU suburbs. 90% = higher than 90% of suburbs
How Trinity Gardens compares to ~15,000 Australian suburbs
Frequently Asked Questions
Is Trinity Gardens a good suburb to live in?
Trinity Gardens consistently attracts professionals and families with strong finances: household income ranks at the 75th percentile nationally and 53.9% of residents hold a university qualification, which is 23.8 points above the national figure. With 77.1% separate houses and a stable population where 76.6% stay year on year, it is a settled rather than transient community.
What is the median house price in Trinity Gardens?
The median house price is $1,606,300 as of the first quarter of 2026, down from $1,650,000 a year earlier, a fall of 2.6%. Monthly mortgage repayments average $2,184, giving a mortgage-to-income ratio of 25.1%, below the 30% stress threshold. Weekly rent averages $375.
What schools are in Trinity Gardens?
No schools are recorded within the Trinity Gardens suburb boundary in this dataset. The suburb's 1,264 residents rely on schools in surrounding areas of postcode 5068. The local population is highly educated, with 53.9% holding a university qualification, which is 23.8 percentage points above the national average.
Is Trinity Gardens safe?
Trinity Gardens recorded 85 total incidents with a crime rate of 67.2 per 1,000 residents. For context, the suburb has a population of only 1,264, so absolute incident numbers are small. Only 4.2% of residents, around 52 people, need daily assistance, and the volunteering rate of 17.7% suggests active community engagement.
Is Trinity Gardens good for property investment?
At $375 weekly rent against a $1,606,300 median, the gross yield is below 1.5%, making cash flow returns modest. The 6.0% vacancy rate is elevated compared to tighter Adelaide markets. With just 1 development application in 12 months and a 0.6 square kilometre footprint, supply is highly constrained, which historically supports capital values over time.
How is Trinity Gardens's population changing?
The population stands at 1,264 in a 0.6 square kilometre suburb at a density of 2,119 people per square kilometre. A turnover rate of 23.4% means roughly one in four properties changes hands annually, while 76.6% of residents remain in place year to year, indicating a stable base with selective rather than speculative movement.
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), state Valuer-General (house prices), Department of Jobs SALM (unemployment), ACARA (school ICSEA), state Crime Statistics agencies (offences), council DA portals (development applications). Population forecasts use a Hamilton-Perry cohort model calibrated to ABS ERP.
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