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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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Underdale has an estimated 3,179 residents, up from 2,429 at the 2021 Census — a change of 750 people, or 30.9%. Growth has averaged 5.3% a year over five years, faster than 95% of areas nationally. Overseas migration accounts for 89.0% of that increase. That puts 3,117 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
According to AreaSearch evaluations combining broader regional ABS population releases with post-Census validated addresses, the suburb of Underdale has reached an estimated population of approximately 3,179 as of Aug 2026. Compared to the 2021 Census tally of 2,429 people, this represents an expansion of 750 people (30.9%). This estimate stems from an assessed resident population base of 3,178 following the ABS ERP update in June 2025 alongside 34 validated new addresses recorded post-Census. Consequently, population density stands at 3,116 persons per square kilometer, placing the locality within the highest national quartile analyzed by AreaSearch.
Outpacing South Australia's overall expansion of 7.7% as well as its wider SA3 region, Underdale's 30.9% rate of growth positions it at the forefront of regional demographic increases. Recent expansion was predominantly fueled by incoming overseas migrants, who generated around 89.0% of net population additions. Projections utilize ABS/Geoscience Australia models released in 2024 with a 2022 baseline for local SA2 boundaries. Where figures are unavailable or extend past 2032, models incorporate the SA State Government's 2023 age-bracket projections derived from 2021 numbers, utilizing weighted LGA-to-SA2 aggregation methods. Looking forward, long-term demographic expansion is anticipated to sit marginally under the nationwide median for statistical areas. By 2041, SA2 aggregate models project the suburb of Underdale will add 311 persons, equating to an overall growth rate of 9.8% across the 16 years.
Frequently Asked Questions - Population
97 new dwellings have been approved in Underdale over the past five years, an average of 19 a year. That places the area in the 90th percentile for residential development activity nationally, about 6 approvals per 1,000 residents a year. Of the 32 dwellings approved in the latest reporting year, 59% were detached houses and the rest townhouses or apartments. Approvals are currently running at an annualised 59, 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
Examining ABS residential approval figures distributed to the statistical area, AreaSearch indicates that Underdale averages roughly 19 residential dwelling approvals per year, totaling approximately 97 dwellings across the previous 5 financial years (between FY-21 and FY-25), with 59 recorded during FY-25 to date. With 4.6 incoming residents arriving per finished residence over the last 5 financial years (between FY-21 and FY-25), housing demand heavily exceeds newly built stock, driving competitive buyer interest and pricing momentum. Meanwhile, the mean expected construction cost per dwelling sits at $512,000, underscoring homebuilder focus on high-end residential stock.
Non-residential building activity is also highlighted by $9.5 million in commercial building approvals secured within the current financial year. Per capita residential construction volume in Underdale surpasses Greater Adelaide by 61.0%, widening the selection of housing options. Of these newly approved builds, 59.0% represent separate houses, while medium-density formats including townhouses and apartments account for 41.0%, delivering varied accommodation types across diverse price tiers, from traditional stand-alone homes to compact living. The suburb registers roughly 45 people per dwelling approval, highlighting an expanding construction environment. Long-term forecasts indicate Underdale will gain 310 residents by 2041 relative to the latest AreaSearch quarterly estimate. Current construction trajectories suggest local residential pipelines are well placed to absorb projected demand, which could provide favorable buyer conditions and potentially support higher population totals than baseline estimates.
Frequently Asked Questions - Development
Development applications around Underdale
Loading development applications…
| Lodged | Address | Description | Type | Distance | Status |
|---|
SOURCE: Planning portals and council registers, compiled by AreaSearch. Distance & bearing measured from the suburb midpoint.
AreaSearch tracks 12 current infrastructure and development projects close to Underdale, worth an estimated $1.03 billion. 4 are already under construction. The pipeline spans sports & recreation, retail 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 capital investments, major projects, and state planning frameworks remain significant drivers of local growth. In total 1 project has been catalogued by AreaSearch as having a direct local influence. Prominent regional initiatives include the Henley Beach Road Visioning Project, Harbour Town Premium Outlets Adelaide Expansion, New Women's and Children's Hospital, and North South Corridor, with relevant details set out below.
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Frequently Asked Questions - Infrastructure
Henley Beach Road Visioning Project
City of West Torrens long-term main street renewal for an approximately 3 km corridor between Airport Road and the Bakewell Underpass. The Vision and five Guiding Principles were adopted by council and completed in January 2025. Implementation is now underway in phases: Stage 1 of the Thebarton Theatre upgrade is complete, Jervois Street has been upgraded with wider footpaths, a traffic and parking study is in progress, shopfront activation works are underway, and a pop-up piazza is being investigated.The vision targets a cosmopolitan, people-friendly boulevard celebrating cultural diversity, improved public transport, green space, and pedestrian access.
Southwark Grounds
The $1 billion Southwark Grounds precinct is transforming the 8.4-hectare former West End Brewery site into a sustainable inner-city neighborhood. The masterplan includes 1,300 homes with a 20% affordable housing mandate, a supermarket, childcare centre, and aged care facility. The project features 'Brewery Green', a major civic space connecting the heritage-listed Walkerville Brew Tower to the River Torrens. Civil works and infrastructure delivery are active throughout 2026, with the first residential stage, Founder's Row, nearing completion and West Village townhouses currently in market.
Frank Norton Reserve Redevelopment
A major redevelopment project for the Frank Norton Reserve, set to begin in late January 2025. This project focuses on enhancing community recreation facilities and public spaces.
Thebarton Theatre Complex Redevelopment
An upgrade of the iconic State heritage-listed Thebarton Theatre Complex. The redevelopment aims to conserve its unique heritage values while enhancing its ongoing use as a working entertainment venue, including improved accessibility, new entry lobby, bathrooms, outdoor areas, and operational improvements. Construction is underway, with Stage 1 expected to complete by mid-late 2025, and the theatre set to reopen in October 2025.
Adelaide Crows Thebarton Oval Facility
Development of a new state-of-the-art training, administration, and community headquarters for the Adelaide Football Club at Thebarton Oval. The $100 million project includes a two-storey building with a caf', members lounge, function centre, and interactive museum, serving as a permanent match-day home for the AFLW team.
Thebarton Technology Hub
A master plan to develop and promote a bioscience and technology precinct within Thebarton. The initiative aims to attract new early-stage companies, improve the precinct's environment for existing employees, and enhance amenity and visual credibility.
Construction of Shared Path, Thebarton
Construction of a shared path in Thebarton, funded by a grant of $150,000.
Land Purchase for Shared Path, City of West Torrens
Land purchase to enable future shared path development within the City of West Torrens, supported by a grant of $290,000.
1,939 residents of Underdale are employed, from a labour force of 1,994. Unemployment sits at 2.8%, with participation at 73.9%. Weighted for its industry mix, the area's sectors are forecast to grow about 6.7% 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
Underdale possesses a well-educated workforce, with essential services sectors well represented, an unemployment rate of just 2.8%, and 11.8% in estimated employment growth over the past year, based on AreaSearch aggregation of statistical area data. As of March 2026, 1,939 residents are in work while the unemployment rate is 1.1% below Greater Adelaide's rate of 3.8%, and workforce participation is well beyond standard (73.9% compared to Greater Adelaide's 66.4%). Based on Census responses, a low 11.3% of residents were found to work from home, though Covid-19 lockdown impacts should be considered.
The primary employment fields for local residents comprise health care & social assistance, education & training, and retail trade. Finance & insurance represents a notable specialization, employing residents at 1.4 times the regional proportion. In contrast, manufacturing holds a smaller footprint, employing 5.6% of local workers compared to 7.0% across the region. A ratio of 0.7 jobs per resident at the time of the Census points to above-average job availability within the surrounding area. According to ABS and SALM metrics compiled by AreaSearch across broader statistical boundaries, the 12 months leading to March 2026 recorded an 11.8% rise in employment alongside a 10.5% expansion in the active workforce, lowering the unemployment rate by 1.1 percentage points. By comparison, Greater Adelaide experienced a 4.2% employment rise, a 4.0% labor pool expansion, and a 0.2 percentage point drop in unemployment. Broader labor trends from Jobs and Skills Australia's Mar-26 projections provide context for prospective demand in Underdale. Nationally, employment is projected to rise 6.6% over five years and 13.7% over ten years, with performance varying widely across industries. Applying these sector-level expectations to Underdale's industry distribution yields a projected local job increase of 6.7% across five years and 14.0% across ten years (illustrative weighted extrapolation excluding localized demographic changes).
Frequently Asked Questions - Employment
Median household income in Underdale is $1,578 a week (about $82,000 a year), with median personal income at $830 a week. ATO records put median taxable income at $53,661 a year against an average of $67,028. 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
Aggregated ATO data from AreaSearch for financial year 2023 places taxpayer income in Underdale closely in line with nationwide norms. In the suburb of Underdale, taxable median income is $53,661 and average earnings reach $67,028, compared to $54,808 and $66,852 respectively for Greater Adelaide. Accounting for an indexed 10.17% rise in the Wage Price Index since financial year 2023, updated figures reach approximately $59,118 (median) and $73,845 (average) as of March 2026. Across personal, family, and household levels, Census earnings sit within the 40th to 55th percentiles. The single largest earnings bracket encompasses 30.3% of earners (963 residents) making $1,500 - 2,999 weekly, mirroring the wider regional rate of 31.8%.
Household financial pressure remains notable, with uncommitted income standing at 84.4% (41st percentile), while the area occupies the 5th decile on the SEIFA income scale.
Frequently Asked Questions - Income
Underdale had 1,016 occupied dwellings at the 2021 Census, 64% detached houses and 19% apartments. 31% are owned with a mortgage, 38% rented and 31% owned outright. At that Census the median rent was $310 a week and the median mortgage repayment $1,786 a month. Rent absorbs 19.6% of household income here and mortgage repayments 26.1%. Dwelling stock, tenure and housing costs are 2021 Census measures — the only source that counts dwellings at this boundary size.
Detail
Census records show Underdale's housing stock consisting of 63.6% detached houses and 36.5% other formats (encompassing apartments, townhouses, semi-detached and related structures), contrasting with Adelaide metro where houses make up 75.2% and other dwellings comprise 24.9%. Outright home ownership matched the wider Adelaide metro rate of 31.1%, alongside 31.1% under mortgage and 37.9% occupied by private renters. Median monthly mortgage obligations of $1,786 were higher than the metropolitan baseline of $1,562, whereas median weekly rents of $310 sat below the Adelaide metro median of $320. Relative to Australia-wide benchmarks, local monthly mortgage repayments fall below the national figure of $1,863, and weekly rents sit well below the nationwide $375 average.
Frequently Asked Questions - Housing
Underdale counted 1,016 households at the 2021 Census, an estimated 1,330 today, averaging 2.3 people each. 28% are couples with children, against 24% couples without children. 32% of households are people living alone, and families average 1.3 children. Household and family composition is measured only by the Census, so these are 2021 figures.
Detail
Family units constitute the majority of living arrangements at 62.4%, consisting of couples with children (28.2%), couples without children (24.2%), and single parent families (8.7%). The remaining 37.6% consists of non-family households, including single-person homes at 31.9% and group arrangements at 5.4%. The median household size of 2.3 occupants is slightly below the Greater Adelaide benchmark of 2.5.
Frequently Asked Questions - Households
35.6% of adults in Underdale hold a university qualification, including 23.9% with a bachelor degree and 9.2% with postgraduate qualifications. A further 18.2% hold a vocational qualification. 2 schools serve the area, with 628 enrolment places and an average ICSEA of 998 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
Tertiary educational attainment in the locality exceeds broader benchmarks, with 35.6% of residents aged 15+ possessing university credentials compared to 28.9% across Greater Adelaide and 25.7% statewide. Bachelor degrees form the largest segment at 23.9%, alongside 9.2% with postgraduate qualifications and 2.5% holding graduate diplomas. In addition, vocational and trade training is widespread, with 28.9% of persons aged 15+ holding technical qualifications, split between certificates (18.2%) and advanced diplomas (10.7%). Community participation in formal study is substantial, with 26.6% of the local population actively enrolled in an educational institution. Among these, primary schooling accounts for 8.1%, tertiary study comprises 6.5%, and secondary schooling covers 5.6%.
Frequently Asked Questions - Education
Schools Detail
Public transport in Underdale reaches 14 stops on 23 routes, timetabled for about 1,700 services a week. The typical home sits about 150 m from its nearest stop. Buses carry the largest share of public transport commuters. Households keep an average of 1.3 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
Underdale contains 14 operational public transit points utilizing bus networks, serviced across 23 routes that deliver 1,680 scheduled passenger trips each week. Transit proximity is high, with households situated an average of 153 meters from a stop. As an established residential pocket, outward commuting prevails, with private vehicles accounting for 81% of trips and bus transit capturing 9%. Household vehicle ownership stands at an average of 1.3 vehicles per dwelling. Work-from-home participation was recorded at 11.3% in the 2021 Census, which may reflect pandemic-era conditions. Transit schedules provide a combined average of 240 journeys daily across all available lines, delivering around 120 services per stop every week.
Frequently Asked Questions - Transport
Transport Stops Detail
74.1% of residents in Underdale report no long-term health condition. 3.9% need daily assistance with core activities, and 53.5% hold private health cover. The standardised death rate runs at 5.3 per 1,000 residents. Health conditions, assistance needs and insurance are 2021 Census measures; the death rate comes from current ABS releases.
Detail
Health assessments by AreaSearch indicate solid overall outcomes across Underdale, with low incidence of chronic illnesses observed across both youth and elderly demographics, alongside favorable mortality figures. Private health insurance coverage marginally outpaces the typical SA2 average, covering approximately 53% of the resident population (~1,700 people). Mental health conditions and asthma represent the most frequently reported diagnoses, affecting 6.6 and 6.4% of residents respectively. Conversely, 74.1% of the community reported having no diagnosed long-term health ailments, exceeding the 67.9% benchmark across Greater Adelaide. Working-age cohorts exhibit low levels of chronic disease.
Residents aged 65 and over account for 17.8% of the local population (565 people), below the 19.1% share recorded in Greater Adelaide, with local seniors achieving high national ratings for overall health.
Frequently Asked Questions - Health
33.6% of Underdale residents were born overseas and 35.5% speak a language other than English at home, more culturally diverse than 78% of areas nationally. The largest reported ancestries are English (19.1%) and Australian (18.2%). Ancestry, language and country of birth are counted only by the Census, so these are 2021 figures.
Detail
Underdale exhibits a diverse demographic makeup, with 33.6% of residents born abroad and 35.5% using a non-English language at home. Christianity constitutes the largest religious affiliation, practiced by 49.6% of the community. The most notable deviation is the Other category, which represents 3.9% of locals compared to 1.8% regionally across Greater Adelaide. Evaluating parental ancestry, the three most prominent heritages in Underdale are English at 19.1% (below the regional level of 27.8%), Australian at 18.2%, and Other at 12.3%. Specific international backgrounds show notable regional concentration, including Italian ancestry at 10.9% (versus 5.2% across the wider region), Greek at 6.6% (versus 2.0%), and Indian at 4.9% (versus 2.3%).
Frequently Asked Questions - Diversity
The median resident of Underdale is 38. 28.9% 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 demographic profile of Underdale leans toward younger cohorts. Based on estimates updated to August 2026, 32.5% of the community comprises adults aged 25 - 44, exceeding Greater Adelaide's 28.9%, while youth and children aged 0 - 24 represent 26.4% against 29.0% regionally. The median age is estimated at 38 as at August 2026, matching the 2021 Census figure and sitting 1 year below the Greater Adelaide median of 39 recorded at the same Census. Between the Census and current estimates, the cohort aged 45 - 64 reduced from 26.0% to 23.5%.
Looking ahead to 2041, senior demographics aged 65+ are projected to drive the majority of local growth, gaining 149 residents (26%) to reach 715.
Frequently Asked Questions - Age
Data & MethodBoundaries, Sources & Method for Underdale
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 — 34 validated new addresses here. The headline figure is therefore a current estimate for Aug 2026, not a 2021 count (2,429 at the 2021 Census → 3,179 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 (SAL41488). QuickStats reports 2021 only — the figures on this page are more current wherever the ledger shows a later date.