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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 3,176 residents, up from 2,429 at the 2021 Census — a change of 747 people, or 30.8%. 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 3,114 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 investigations of ABS population estimates for the region, alongside newly confirmed address points from AreaSearch following the Census, the suburb of Underdale has a population estimated to be 3,176 in May 2026. This represents a growth of 747 individuals (30.8%) relative to the 2,429 residents counted during the 2021 Census. This population shift is calculated from the estimated resident figure of 3,176, derived by AreaSearch through analysing the ABS ERP data from June 2025 together with 34 newly validated addresses since the Census. Such a population count corresponds to a density of 3,113 persons per square kilometer, placing the suburb in the highest quarter of all Australian locations evaluated by AreaSearch.
The 30.8% expansion rate in the suburb of Underdale since the 2021 Census outpaced the state growth of 7.5% and the local SA3 region, positioning the locality as a regional leader in expansion. The population gains were heavily supported by overseas arrivals, who accounted for roughly 89.0% of the overall growth in recent times. AreaSearch utilizes ABS and Geoscience Australia projections for each individual SA2, published in 2024 using 2022 as the baseline. For any SA2 regions lacking this coverage, and for projections beyond 2032, regional age-based figures from the SA State Government released in 2023 using 2021 data are used, with modifications made by combining population growth figures from local government areas to the SA2 level. Looking at future demographic trends, the suburb of Underdale is projected to experience population expansion slightly lower than the median of Australian statistics areas, with expectations of adding 313 residents by 2041 using consolidated SA2 projections, representing an overall increase of 9.9% across the 16 years.
Frequently Asked Questions - Population
109 new dwellings have been approved in Underdale over the past five years, an average of 21 a year. That places the area in the 87th percentile for residential development activity nationally, about 7 approvals per 1,000 residents a year. Of the 28 dwellings approved in the latest reporting year, 54% were detached houses and the rest townhouses or apartments. Approvals are currently running at an annualised 61, 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
AreaSearch evaluation of ABS building approval statistics distributed from regional data indicates that the suburb of Underdale averages approximately 21 approved residential dwellings each year. A total of 109 homes were approved during the 5 financial years spanning FY-21 to FY-25, and an additional 56 approvals have been logged in FY-26 so far. With an average of 6.6 net new residents joining the local population annually for every dwelling completed during the 5 financial years spanning FY-21 to FY-25, local demand is outpacing incoming supply, which commonly drives prices upward and intensifies buyer competition, while new builds carry an average construction cost of $465,000, pointing to a developer focus on high-end, premium projects.
Furthermore, commercial building approvals worth $9.5 million have been registered during this financial year, pointing to steady non-residential development. Relative to Greater Adelaide, the suburb of Underdale registers marginally higher building activity, tracking 18.0% above the regional average per capita over the 5 year timeframe, which helps sustain existing home values while offering buyers options. Newly approved construction consists of 54.0% freestanding houses alongside 46.0% medium and high-density formats, with a rising volume of apartments and townhouses providing choices across price categories, spanning from larger family options to compact, lower-cost options. Recording roughly 78 residents per approved residential building, the suburb of Underdale displays demographic trends typical of a growth locality. Long-term projections indicate that the suburb of Underdale will gain 313 residents by 2041 based on the most recent quarterly estimate from AreaSearch. If current building rates persist, the upcoming housing pipeline should easily accommodate this growth, ensuring balanced conditions for purchasers and potentially enabling expansion levels above current demographic forecasts.
Frequently Asked Questions - Development
Development applications around Underdale
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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 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 infrastructure shifts, major projects, and town planning decisions are critical drivers of local performance. A single project has been identified by AreaSearch as having a likely impact on the immediate area. The main initiatives include the Henley Beach Road Visioning Project, the Harbour Town Premium Outlets Adelaide Expansion, the New Women's and Children's Hospital, and the North South Corridor, with details provided on those expected to be most relevant.
Professional plan users can use the search below to filter and access additional projects.
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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.
1,953 residents of Underdale are employed, from a labour force of 2,006. Unemployment sits at 2.6%, with participation at 74.1%. 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
The suburb of Underdale is characterized by an educated labor force, a strong showing in basic services, an unemployment rate of only 2.6%, and estimated job numbers increasing by 12.0% over the past year, according to AreaSearch regional data. In March 2026, there were 1,953 employed locals, the unemployment level sat 1.2% lower than the 3.8% recorded in Greater Adelaide, and the labor force participation rate reached an elevated 74.1% compared to 66.6% across Greater Adelaide. According to Census replies, a small share of 11.3% of workers operated from home, though this may have been influenced by pandemic-related movement restrictions.
The primary employment fields for working locals are health care & social assistance, education & training, and retail trade. The local workforce has a notable concentration in finance & insurance, representing 1.4 times the regional proportion. Conversely, industrial manufacturing is less common, making up 5.6% of the workforce in the suburb of Underdale relative to 7.0% across Greater Adelaide. The presence of 0.7 workers for every local inhabitant at the Census demonstrates a higher availability of local jobs than is typical. Based on AreaSearch aggregation of SALM and ABS statistics for the broader district, during the twelve months leading to March 2026, local employment numbers expanded by 12.0% and the overall labor pool grew by 10.6%, resulting in a 1.2 percentage point drop in unemployment. In comparison, Greater Adelaide experienced a 4.2% rise in employment, a 4.0% increase in the labor force, and a 0.2 percentage point reduction in unemployment. National employment projections from Jobs and Skills Australia dated May-25 offer additional context on future labor needs in the suburb of Underdale. These models, spanning five and ten years, are mapped against local jobs data to project expansion. While nationwide employment is projected to grow by 6.6% over five years and 13.7% over ten years, the rates of change vary by industry. Combining these industry trends with the local employment profile suggests employment in the suburb of Underdale should grow by 6.7% over five years and 14.0% over ten years, noting this is a simple weighted calculation for demonstration that excludes local population projection models.
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
The suburb of Underdale has an income level that aligns closely with the national average, according to ATO figures compiled by AreaSearch for financial year 2023. The median tax returns in the suburb of Underdale were $53,661 and average earnings were $67,028, compared to regional medians of $54,808 and averages of $66,852 in Greater Adelaide. Accounting for a 10.17% rise in the Wage Price Index since financial year 2023, local values are estimated at approximately $59,118 for the median and $73,845 for the average as of March 2026. According to the Census, household, family, and individual incomes are moderate in the suburb of Underdale, placing between the 40th and 55th percentiles.
Distribution statistics show the dominant income band is the $1,500 - 2,999 category, containing 30.3% of locals (962 people), matching the regional rate of 31.8%. Affordability pressures are high, with residents retaining just 84.4% of their income, which sits in the 41st percentile, while the SEIFA index ranks the area in the 5th decile for income.
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
Housing types in the suburb of Underdale at the recent Census consisted of 63.6% detached houses and 36.5% alternative dwellings including apartments, semi-detached, and other types, compared to 75.2% detached houses and 24.9% alternative dwellings in Greater Adelaide. Home ownership rates in the suburb of Underdale matched the Adelaide metro benchmark of 31.1%, with remaining properties held under a mortgage (31.1%) or occupied by renters (37.9%). The median monthly home loan payment was $1,786, which is higher than the Adelaide metro average of $1,562, while the weekly rent median was $310 compared to the Adelaide metro average of $320.
Nationally, mortgage costs in the suburb of Underdale are below the Australian average of $1,863, and typical rent costs are much lower than the national median of $375.
Frequently Asked Questions - Housing
Underdale counted 1,016 households at the 2021 Census, an estimated 1,328 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
Families represent the primary household type at 62.4%, consisting of couples raising children at 28.2%, couples without children at 24.2%, and single parents with children at 8.7%. Non-family households comprise the remaining 37.6% of homes, consisting of single-person households at 31.9% and shared group households at 5.4%. The median household size of 2.3 people is smaller than the Greater Adelaide average 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
The educational makeup of the area is distinct in the region, with higher education qualification rates showing 35.6% of residents aged 15+ holding a degree, compared to the SA average of 25.7% and the Greater Adelaide average of 28.9%. Bachelor programs represent the most common degree at 23.9%, followed by postgraduate study at 9.2% and graduate diplomas at 2.5%. Practical and vocational qualifications are also common, with 28.9% of residents aged 15+ holding trade credentials, consisting of advanced diplomas at 10.7% and certificates at 18.2%. Engagement in learning is high, with 26.6% of the population enrolled in an educational program.
This contains 8.1% of residents in primary schooling, 6.5% attending tertiary institutions, and 5.6% in secondary schools.
Frequently Asked Questions - Education
Schools Detail
Public transport in Underdale reaches 14 stops on 24 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
Public transit statistics show 14 active stops operating in the suburb of Underdale, consisting of bus services. These stops are served by 24 unique routes, which provide a total of 1,682 passenger trips each week. Access to transit is rated as excellent, with locals living an average of 153 meters from their closest stop. Being a mostly residential suburb, the majority of working residents travel outside the area, with private cars remaining the primary travel mode at 81%, and buses used by 9%. Households own an average of 1.3 cars.
A small proportion of 11.3% of workers worked from home, based on the 2021 Census, which may have been impacted by pandemic restrictions. Transit service frequency averages 240 trips daily across all local routes, which translates to about 120 weekly journeys for each individual stop.
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
Assessments of local health statistics point to strong well-being outcomes throughout the suburb of Underdale, with AreaSearch analysis of mortality rates and chronic health conditions showing low rates of common illnesses across younger and older demographics, while the share of residents with private health insurance is just ahead of the typical SA2 area at approximately 53% of the population, representing about 1,698 individuals. The primary medical diagnoses among locals were mental health conditions and asthma, affecting 6.6 and 6.4% of residents, respectively, while 74.1% of the population reported no long-term illnesses, compared to 67.9% across Greater Adelaide.
The working-age population exhibits strong health with low rates of chronic diseases. Those aged 65 and over make up 18.5% of the community, representing 587 individuals. Seniors in this area experience particularly positive health outcomes, with national rankings exceeding those of the general local population.
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
The suburb of Underdale registers high cultural diversity, with 33.6% of the local population born overseas and 35.5% using a non-English language at home. Christianity is the primary religion, followed by 49.6% of residents in the suburb of Underdale. The most pronounced difference is in the Other religious category, which represents 3.9% of the local population compared to 1.8% across Greater Adelaide. Based on parental birthplaces, the largest ancestry groups in the suburb of Underdale are English at 19.1%, which is lower than the Greater Adelaide average of 27.8%, Australian at 18.2%, and Other at 12.3%.
Significant differences are present in other backgrounds, with Greek ancestry represented at 6.6% in the suburb of Underdale compared to 2.0% in Greater Adelaide, Italian ancestry at 10.9% compared to 5.2% regionally, and Indian ancestry at 4.9% compared to 2.3% regionally.
Frequently Asked Questions - Diversity
The median resident of Underdale is 38. 28.4% 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
With a median age of 38, the suburb of Underdale is close to the Greater Adelaide figure of 39 and identical to the national average of 38 years. Relative to Greater Adelaide, the 25 - 34 cohort is highly represented at 16.9% locally, while children aged 5 - 14 are less common at 9.9%. Since 2021, the 65 to 74 age group rose from 8.9% to 9.9% of the population, while the 55 to 64 group decreased from 13.3% to 11.6%. Modeling suggests that by 2041, the local age structure will change, with the 45 to 54 cohort projected to increase by 80 people (21%) from 374 to 455, while the 0 to 4 group is projected to decrease by 5 residents.
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 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 9 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 2025 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. | ||
| Infrastructure projects | Infrastructure Australia, Local governments Daily | May 2026 3 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 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 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 May 2026, not a 2021 count (2,429 at the 2021 Census → 3,176 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 May 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.