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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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Trinity Gardens has an estimated 1,719 residents, up from 1,264 at the 2021 Census — a change of 455 people, or 36.0%. Growth has averaged 1.3% a year over five years, faster than 96% of areas nationally. Overseas migration accounts for 100.0% of that increase. That puts 2,865 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
Based on analysis of ABS population updates for the broader area and new addresses validated by AreaSearch, as of Feb 2026, the estimated population of Trinity Gardens is around 1,719. This reflects an increase of 455 people (36.0%) since the 2021 Census, which reported a population of 1,264 people. The change is inferred from the resident population of 1,688, estimated by AreaSearch following examination of the latest ERP data release by the ABS in June 2024 and address validation since the Census date. This level of population equates to a density ratio of 2,865 persons per square kilometer, placing it in the upper quartile relative to national locations assessed by AreaSearch.
Trinity Gardens's growth rate exceeded the state (9.0%) and Greater Adelaide since the 2021 census, marking it as a growth leader in the region. Population growth for the suburb was primarily driven by overseas migration during recent periods. AreaSearch is adopting ABS/Geoscience Australia projections for each SA2 area, released in 2024 with 2022 as the base year. For areas not covered and years post-2032, SA State Government's Regional/LGA projections are adopted with adjustments made employing a method of weighted aggregation of population growth from LGA to SA2 levels. Moving forward, an above median population growth is projected for statistical areas analysed by AreaSearch. The suburb is expected to expand by 282 persons to 2041 based on aggregated SA2-level projections, reflecting a reduction of 6.6% in total over the 17 years.
Frequently Asked Questions - Population
113 new dwellings have been approved in Trinity Gardens over the past five years, an average of 22 a year. That places the area in the 57th percentile for residential development activity nationally, about 13 approvals per 1,000 residents a year. Of the 29 dwellings approved in the latest reporting year, 62% were detached houses and the rest townhouses or apartments. Approvals are currently running at an annualised 30, running ahead of 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
Based on AreaSearch analysis of ABS building approval numbers allocated from statistical area data, Trinity Gardens has seen approximately 22 new homes approved annually. Over the past five financial years, between FY-21 and FY-25, around 113 homes were approved, with an additional 15 approved so far in FY-26. On average, about 0.7 new residents per year have been arriving for each new home over these five years, indicating that supply is meeting or exceeding demand. This has led to increased buyer choice and potential population growth above projections. The average construction cost value of new homes has been approximately $505,000, suggesting a focus on the premium segment with upmarket properties.
In FY-26, there have been around $1.7 million in commercial approvals, indicating minimal commercial development activity compared to residential development. When comparing Trinity Gardens to Greater Adelaide, it has 164.0% more new home approvals per person, which should provide buyers with ample choice. This level is significantly higher than the national average, reflecting strong developer confidence in the area's housing market. New development in Trinity Gardens consists of approximately 62.0% detached houses and 38.0% attached dwellings. This represents a shift from existing housing patterns, which are currently 77.0% houses. This change suggests diminishing developable land availability and a response to evolving lifestyle preferences and housing affordability needs. With around 50 people per dwelling approval, Trinity Gardens exhibits characteristics of a growth area. However, population projections indicate stability or decline, suggesting that housing demand pressures may be reduced in the future. This could benefit potential buyers by providing more choices and potentially easing affordability concerns.
Frequently Asked Questions - Development
Development applications around Trinity Gardens
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| Lodged | Address | Description | Type | Distance | Status |
|---|
SOURCE: Planning portals and council registers, compiled by AreaSearch. Distance & bearing measured from the suburb midpoint.
AreaSearch tracks one current infrastructure or development project inside Trinity Gardens. A further 6 sit in the immediately surrounding suburbs, taking the tracked pipeline within reach of the area to $365 million. 5 are already under construction and 2 are due for completion within three years. The pipeline spans communities, sports & recreation and education & training. 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 changes significantly influence an area's performance. AreaSearch has identified three projects likely impacting the area: Trinity Valley Stormwater Drainage Upgrade, Payneham Memorial Swimming Centre Redevelopment, Norwood Green Redevelopment, and Norwood Oval Redevelopment. The following details these key projects in order of likely relevance.
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Frequently Asked Questions - Infrastructure
Norwood Green
A $120 million master-planned mixed-use community at 100 Magill Road, Norwood, built on the former Caroma factory site. The precinct comprises 111 apartments across five seven-storey buildings and 33 townhouses, arranged around a communal village green. Ground-floor retail includes an ALDI supermarket, East End Cellars, cafes and specialty tenants. Designed by Tectvs architects and jointly developed by Buildtec Group and Catcorp. Final stage apartments are now available, with earlier stages completed and occupied.
Trinity Valley Stormwater Drainage Upgrade
A multi-stage project involving the installation of new stormwater drainage infrastructure across St Morris, Trinity Gardens, Maylands, and Stepney. Designed to reduce flood risk, increase capacity for 1-in-100-year storm events, and utilise Council reserves for temporary stormwater detention. Stages 2 and 3 completed May 2024. Stages 1 and 4 are scheduled for 2025.
Osmond Terrace Mixed-Use Development
Proposed contemporary mixed-use development delivering 85 apartments with ground-floor retail and commercial spaces at 66-78 Osmond Terrace, opposite Norwood Oval in the inner-eastern Adelaide suburb of Norwood.
Payneham Memorial Swimming Centre Redevelopment
The $60 million redevelopment of the Payneham Memorial Swimming Centre into a state-of-the-art aquatic facility. It includes a 10-lane 50m outdoor pool, two indoor pools (learn to swim pool and 25m pool), a 14m high water slide, outdoor splash play area, new change rooms, a multi-purpose meeting room, and kiosk. Expected completion early 2026.
Hamilton Hill (former Magill Youth Training Centre, Woodforde)
Masterplanned community by Kite Projects on the former Magill Youth Training Centre site in Woodforde, delivering around 440 homes across house allotments, townhouses and apartments. All townhouses, apartments and house and land packages are now sold. The final stage, St Andrews, comprises 53 architecturally designed one and two bedroom apartments on the northern edge of the site opposite the six hectare Lewis Yarlupurka O'Brien Reserve; construction has commenced with Build Society appointed as builder. The development includes a landscaped reserve with an amphitheatre, native creeks and walking and cycling trails connecting to the adjacent Morialta Conservation Park.
Norwood Oval Clubrooms and Members Facilities Redevelopment
Completed redevelopment of Norwood Oval, including the new two-storey Wolf Blass Community Centre, 180-seat members clubroom and function space, Premier's Bar, upgraded changerooms, umpire and away-team facilities, kiosk, toilets, merchandise outlet, renovated Sir Edwin Smith Stand, improved Woods Street entry and streetscape works. The project supports SANFL, AFLW, SANFLW and community football use.
East Marden Primary School Major Upgrades
East Marden Primary School is undergoing a facility upgrade, including a new administration building with reception/foyer, leadership offices, meeting rooms, staff preparation space, a staff room, and unisex staff and student amenities. Additionally, two new buildings will comprise general learning areas, withdrawal areas, teacher preparation space, and unisex student amenities. The project also involves the demolition of ageing infrastructure. Project budget is $8.91 million.
786 residents of Trinity Gardens are employed, from a labour force of 803. Unemployment sits at 2.1%, with participation at 57.8%. Weighted for its industry mix, the area's sectors are forecast to grow about 7.1% 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. Unemployment and labour force come from ABS Small Area Labour Markets, updated quarterly; the industry and occupation profile is from the 2021 Census.
Detail
Trinity Gardens has a highly educated workforce. Professional services are strongly represented. The unemployment rate is 2.1%. Employment growth over the past year was estimated at 3.1%, based on AreaSearch aggregation of statistical area data. As of September 2025786 residents were in work while the unemployment rate was 1.8% below Greater Adelaide's rate of 3.9%. Workforce participation lagged significantly at 57.8% compared to Greater Adelaide's 66.4%. Only 12.1% of residents worked from home, according to Census responses. Dominant employment sectors include health care & social assistance, education & training, and professional & technical.
The area shows strong specialization in professional & technical, with an employment share of 1.7 times the regional level. Manufacturing representation is lower at 3.9% versus the regional average of 7.0%. There are 1.2 workers for every resident, indicating it functions as an employment hub hosting more jobs than residents and attracting workers from surrounding areas. During the year to September 2025, employment levels increased by 3.1% and labour force increased by 2.9%, causing the unemployment rate to fall by 0.2 percentage points. By comparison, Greater Adelaide recorded employment growth of 3.0%, labour force growth of 2.9%, with unemployment falling 0.1 percentage points. Jobs and Skills Australia's national employment forecasts from May-25 suggest potential future demand within Trinity Gardens. These projections estimate national employment to expand by 6.6% over five years and 13.7% over ten years, with growth rates differing significantly between industry sectors. Applying these industry-specific projections to Trinity Gardens's employment mix suggests local employment should increase by 7.1% over five years and 14.5% over ten years.
Frequently Asked Questions - Employment
Median household income in Trinity Gardens is $2,006 a week (about $104,000 a year), with median personal income at $923 a week. ATO records put median taxable income at $64,366 a year against an average of $88,793. 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
AreaSearch aggregated latest postcode level ATO data released for financial year ending June 2023. Trinity Gardens' median income among taxpayers was $64,366, with an average of $88,793. These figures were among the highest in Australia, compared to Greater Adelaide's median of $54,808 and average of $66,852. Based on Wage Price Index growth of 8.8% since financial year ending June 2023, estimated incomes for September 2025 would be approximately $70,030 (median) and $96,607 (average). According to the 2021 Census, incomes in Trinity Gardens clustered around the 67th percentile nationally. Income analysis showed that 31.4% of residents earned between $1,500 and $2,999 weekly, mirroring the metropolitan region's 31.8%.
Higher earners made up a substantial presence with 31.9% exceeding $3,000 weekly. After housing costs, residents retained 87.4% of their income. The area's SEIFA income ranking placed it in the 8th decile.
Frequently Asked Questions - Income
Trinity Gardens had 482 occupied dwellings at the 2021 Census, 77% detached houses and 10% apartments. 31% are owned with a mortgage, 27% rented and 43% owned outright. At that Census the median rent was $375 a week and the median mortgage repayment $2,184 a month. Rent absorbs 18.7% of household income here and mortgage repayments 25.1%. Dwelling stock, tenure and housing costs are 2021 Census measures — the only source that counts dwellings at this boundary size.
Detail
Trinity Gardens' dwellings, as per the latest Census, consisted of 77.1% houses and 22.9% other dwellings (semi-detached, apartments, 'other'). Compared to Adelaide metro's 75.2% houses and 24.9% other dwellings. Home ownership in Trinity Gardens was at 43.1%, with mortgaged dwellings at 30.5% and rented at 26.5%. Median monthly mortgage repayment was $2,184, higher than Adelaide metro's average of $1,562. Median weekly rent was $375, compared to Adelaide metro's $320. Nationally, Trinity Gardens' mortgage repayments were significantly higher at $2,184 versus the Australian average of $1,863, while rents were comparable at $375.
Frequently Asked Questions - Housing
Trinity Gardens counted 482 households at the 2021 Census, an estimated 656 today, averaging 2.6 people each. 37% are couples with children, against 24% couples without children. 24% of households are people living alone, and families average 1.5 children. Household and family composition is measured only by the Census, so these are 2021 figures.
Detail
Family households account for 73.0% of all households, including 36.8% couples with children, 24.3% couples without children, and 10.5% single parent families. Non-family households constitute the remaining 27.0%, with lone person households at 24.3% and group households comprising 3.1%. The median household size is 2.6 people, larger than the Greater Adelaide average of 2.5.
Frequently Asked Questions - Households
42.1% of adults in Trinity Gardens hold a university qualification, including 28.7% with a bachelor degree and 9.2% with postgraduate qualifications, higher than 80% of areas nationally. A further 14.6% hold a vocational qualification. 1 school serves the area, with 707 enrolment places and an average ICSEA of 1,102 against a national benchmark of 1,000. Qualifications come from the 2021 Census; school enrolments, ICSEA and results come from ACARA's current release.
Detail
Trinity Gardens' residents aged 15+ have a higher proportion with university qualifications (42.1%) compared to South Australia's state average (25.7%) and Greater Adelaide's figure (28.9%). Bachelor degrees are the most prevalent (28.7%), followed by postgraduate qualifications (9.2%) and graduate diplomas (4.2%). Vocational pathways account for 24.2% of qualifications, with advanced diplomas at 9.6% and certificates at 14.6%. Educational participation is notably high, with 31.1% of residents currently enrolled in formal education. This includes 10.1% in primary education, 8.0% in tertiary education, and 7.7% pursuing secondary education.
Frequently Asked Questions - Education
Schools Detail
Public transport in Trinity Gardens reaches 5 stops on 16 routes, timetabled for about 1,200 services a week. The typical home sits about 270 m from its nearest stop. Buses carry the largest share of public transport commuters. Households keep an average of 1.4 vehicles. Stop and service counts are built from operators' published GTFS timetables and refresh with each timetable release; vehicle ownership is from the 2021 Census.
Detail
Trinity Gardens has five active public transport stops, all serving buses. Sixteen different routes operate through these stops, together facilitating 1,159 weekly passenger trips. The area's transport accessibility is rated as good, with residents typically residing 273 meters from the nearest stop. Most residents commute outward due to its residential nature. Cars are the dominant mode of transportation at 84%, followed by buses at 7% and cycling at 4%. On average, there are 1.4 vehicles per dwelling. According to the 2021 Census, only 12.1% of residents work from home, which may be influenced by COVID-19 conditions.
The service frequency averages 165 trips per day across all routes, equating to approximately 231 weekly trips per individual stop.
Frequently Asked Questions - Transport
Transport Stops Detail
74.4% of residents in Trinity Gardens report no long-term health condition, a healthier profile than 85% of areas nationally. 4.1% need daily assistance with core activities, and 62.0% hold private health cover. The standardised death rate runs at 4.1 per 1,000 residents. Health conditions, assistance needs and insurance are 2021 Census measures; the death rate comes from current ABS releases.
Detail
Trinity Gardens shows excellent health outcomes based on AreaSearch's assessment. Mortality rates and chronic condition prevalence are very low across all age groups. Approximately 62% of Trinity Gardens' total population (1,066 people) has private health cover, compared to 52.7% in Greater Adelaide and a national average of 55.7%. The most prevalent medical conditions are arthritis and mental health issues, affecting 6.7% and 6.7% of residents respectively. 74.4% of residents report being completely clear of medical ailments, compared to 67.9% in Greater Adelaide. Working-age residents have low chronic condition prevalence. Trinity Gardens has 15.1% of residents aged 65 and over (259 people), lower than the 19.3% in Greater Adelaide.
Health outcomes among seniors are strong, aligning with national rankings for the general population.
Frequently Asked Questions - Health
28.3% of Trinity Gardens residents were born overseas and 28.5% speak a language other than English at home. The largest reported ancestries are English (22.2%) and Italian (18.9%). Ancestry, language and country of birth are counted only by the Census, so these are 2021 figures.
Detail
Trinity Gardens, surveyed in June 2016, had a higher cultural diversity than most local markets. It had 28.3% of its population born overseas and 28.5% speaking languages other than English at home. Christianity was the predominant religion, comprising 52.2%. Judaism, however, was overrepresented at 0.5%, compared to Greater Adelaide's 0.1%. In ancestry, the top groups were English (22.2%), Italian (18.9%), and Australian (17.1%). Notably, Greek (5.7%) and Russian (0.5%) populations were higher than regional averages of 2.0% and 0.3%, respectively. Chinese population was also notably higher at 7.6%.
Frequently Asked Questions - Diversity
The median resident of Trinity Gardens is 39. That is 1 year younger than at the 2021 Census. 26.5% 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
Trinity Gardens has a median age of 39 years, aligning with Greater Adelaide's average of 39 and closely matching Australia's median of 38. Comparing the two areas, Trinity Gardens has an over-representation of the 55-64 age group at 13.5%, while the 25-34 year-olds are under-represented at 12.5%. According to the 2021 Census, the 25-34 age group grew from 10.9% to 12.5% of Trinity Gardens' population, and the 35-44 cohort increased from 13.2% to 14.6%, while the 45-54 cohort declined from 13.8% to 12.6%. By 2041, demographic modeling indicates significant changes in Trinity Gardens' age profile.
The 85+ cohort is projected to grow by 33%, adding 7 residents to reach a total of 32. All growth in the population will be due to residents aged 65 and older, while declines are anticipated for the 45-54 and 0-4 age cohorts.
Frequently Asked Questions - Age
Data & MethodBoundaries, Sources & Method for Trinity Gardens
8 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 8 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 2024 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. | ||
| 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 3 sections | ||
| Infrastructure projects | Infrastructure Australia, State agencies, Local governments Daily | Jul 2025 about a year ago all 1 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 Jul 2025. | ||
| 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 2024 release), and new dwellings built since Census night are counted from address data. The headline figure is therefore a current estimate for Feb 2026, not a 2021 count (1,255 at the 2021 Census → 1,719 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 Feb 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 (SAL41472). QuickStats reports 2021 only — the figures on this page are more current wherever the ledger shows a later date.