Thornlie
Train terminus suburbs rarely look this lived-in. Thornlie sits at the end of the Thornlie line within Gosnells LGA, holding 23,665 residents at 2,042 per square kilometre, with 91.1% of dwellings as separate houses and 52.9% carrying four or more bedrooms. The migrant overlay is broader than the Anglo-leaning growth corridors further south: 43.5% born overseas (21.9 percentage points above the national rate), and Chinese ancestry (2,393) now sits behind English (7,560) but ahead of Scottish and Irish. SEIFA tells the quieter half of the story, with IEO, IRSD and IRSAD all sitting at decile 4 and IER lifted to decile 6 by full-time dual-earner work, the fingerprint of a mortgage-belt suburb where household income (51.2nd percentile) lags the four-bedroom footprint.
Population
23,665
Median Age
38.0
Household IncomeiMedian weekly household income (ABS Census)
$1,571/wk
DAs (12 months)iDevelopment Applications lodged in the past year
0
Median House
$414K
Estimated from rent (2025)
Thornlie buyers are paying for a detached-house catchment rather than a postcode premium. 91.1% of dwellings are separate houses, 52.9% have four or more bedrooms and only 1.2% are apartments, a typical post-1970s Perth middle-ring profile shared with Gosnells and Maddington. With monthly mortgage repayments averaging $1,625 and a mortgage-to-income ratio of 23.9%, the suburb sits comfortably below the 30% stress line, lower than most newer corridor suburbs like Baldivis where larger loans compress the same ratio higher. The school catchment ladder is shorter than Canning Vale next door: Sacred Heart Catholic Primary (ICSEA 1050) and Forest Crescent Primary (ICSEA 1011) anchor the top, but Thornlie Senior High at ICSEA 969 sits below the national 1000 benchmark, which compresses any catchment premium. Buyers who tolerate that trade-off get four-bedroom detached stock at materially below the Canning Vale price line.
For Buyers
Thornlie buyers are paying for a detached-house catchment rather than a postcode premium. 91.1% of dwellings are separate houses, 52.9% have four or more bedrooms and only 1.2% are apartments, a typical post-1970s Perth middle-ring profile shared with Gosnells and Maddington. With monthly mortgage repayments averaging $1,625 and a mortgage-to-income ratio of 23.9%, the suburb sits comfortably below the 30% stress line, lower than most newer corridor suburbs like Baldivis where larger loans compress the same ratio higher. The school catchment ladder is shorter than Canning Vale next door: Sacred Heart Catholic Primary (ICSEA 1050) and Forest Crescent Primary (ICSEA 1011) anchor the top, but Thornlie Senior High at ICSEA 969 sits below the national 1000 benchmark, which compresses any catchment premium. Buyers who tolerate that trade-off get four-bedroom detached stock at materially below the Canning Vale price line.
For Investors
Yields are workable rather than spectacular. The rented share sits at 21.8%, weekly rent at $330 and the vacancy rate at 5.7%, looser than the sub-2% range running across most Perth middle-ring in 2025, suggesting either a slow turnover stock or a soft demand pocket. Rent-to-income at 21.0% is well under the 30% stress threshold, and forecast rent growth of 3.1% over the recent shift window is modest but positive, distinct from Canning Vale's -2.3% print. Zero approved development applications in the last 12 months means no immediate supply pipeline, while overseas migration of +473 per year keeps demand topped up against an internal outflow of -282. The genuine investor angle here is the Thornlie-Cockburn rail extension: any station-adjacent re-rating would benefit the existing four-bedroom stock more than capital growth has so far implied.
Schools in Thornlie iICSEA: school advantage index. 1000 = national avg, higher = more advantaged
Sacred Heart Primary School
PP-6 · 387 students
Australian Islamic College (Thornlie)
PP-6 · 733 students
Forest Crescent Primary School
K-6 · 627 students
South Thornlie Primary School
K-6 · 421 students
Thornlie Senior High School
7-12 · 1125 students
Demographics
Thornlie's demographic mix is broader than its Anglo bones suggest. 43.5% were born overseas, 21.9 percentage points above the national rate, and the language map runs Mandarin (559), Arabic (235), Punjabi (225), Cantonese (220) and Urdu (201), a Southeast Asian and South Asian blend that contrasts with Reservoir's European-Italian heritage or Greenacre's Arabic-dominant skew. Religion follows: Christianity at 9,355 leads but Islam (2,686) is the second-largest group, and Buddhism (944) reflects the Chinese and Vietnamese contribution. Median age 38 sits 2.0 years below the national benchmark, university qualification rate (29.6%) tracks half a point below national, and average household size of 2.7 is 0.2 above national. The aging trajectory is live (senior share up 5.5 percentage points, young share down 0.5 percentage points), but tempered by the steady overseas inflow of new families.
Age Distribution
Bedrooms
Dwelling Structure
91.1%
Houses
7.6%
Townhouse
1.2%
Apartment
Tenure
The dwelling stock is rigid and detached-dominant. 91.1% separate houses, 7.6% semi-detached and just 1.2% apartments, with 52.9% carrying four or more bedrooms and another 40.4% holding three. Tenure splits 34.3% owned outright, 43.9% on a mortgage and 21.8% renting, a distribution that leans more outright-owned than Canning Vale's mortgage-heavy 50.7%, consistent with Thornlie's older 1970s-90s housing wave. Mortgage-to-income at 23.9% and rent-to-income at 21.0% both sit below the 30% stress threshold despite a household income at only the 51.2nd national percentile, because absolute rents ($330 weekly) and repayments ($1,625 monthly) remain low. WA price data is unreliable so we lean on these ratios: affordability has improved from 51.9 in 2011 to 48.4 in 2021, an improvement of 3.5 percentage points against a population gain of only 3.0% over a decade.
Mortgage / mo
$1,625
Rent / wk
$330
HH Size
2.7
Personal Income / wk
$682
Vacancy Ratei% of dwellings unoccupied on Census night (ABS 2021)
5.7%
Unoccupied
508
Rent / IncomeiMedian rent as % of household income. Over 30% = housing stress
21.0%
Mortgage / IncomeiMedian mortgage as % of household income. Over 30% = housing stress
23.9%
Community Profile
Languages Spoken at Home
Ancestry
Household Composition
24.1%
Couples, no children
19,602
Total families
Economy & Employment
Thornlie's working profile is care-sector and service-trade, not knowledge-economy. Healthcare leads industry employment at 16.7% (1,137 workers), followed by Education (10.9%), Construction (9.2%), Retail (7.1%) and Public Administration (6.8%); the construction share is closer to a tradie-residential base than Canning Vale's family-business pattern. Occupations skew evenly across Professionals (1,742), Clerical/Admin (1,463), Community/Personal Services (1,390), Labourers (1,325) and Machinery Operators/Drivers (1,150), a flatter mix without the Manager-Professional spike seen in higher-SEIFA Perth suburbs. SEIFA decile splits tell the underlying story: IRSD and IRSAD at decile 4, IEO at decile 4, but IER at decile 6, meaning household economic resources sit above the disadvantage profile only because two-earner work compensates for lower educational credentials. Unemployment at 7.5% is 2 percentage points above the 2021 national, and participation at 58.6% reflects a higher share of retirees and stay-at-home parents.
Unemployment
6.2%
Labour Force
13,979
Unemployed
861
Quarterly Trend
Source: SALM Dec-25
Socio-Economic Indexes (SEIFA)iABS index ranking suburbs from 1 (most disadvantaged) to 10 (most advantaged)
Full-time
62.8%
Part-time
29.7%
Participation
58.6%
Employed
10,345
Occupations
Top Industries
University
29.6%
Postgraduate
6.7%
Born Overseas
43.5%
Dwellings
8,400
Transport to Work
The livability case rests on the train terminus and the school count, not retail polish. Thornlie station anchors the eastern end of the Thornlie line, with the planned Thornlie-Cockburn extension intended to convert the terminus into a through-station and add four new stations across the southern corridor, a structural lift Canning Vale and Gosnells will not match. Seven schools sit inside the suburb: Sacred Heart Catholic Primary (ICSEA 1050, 387 enrolments) tops the ICSEA ladder, followed by Australian Islamic College Thornlie (1019, 733), Forest Crescent Primary (1011, 627) and South Thornlie Primary (997, 421), with Thornlie Senior High (969, 1,125) as the public secondary anchor. Transport mix shows 87.1% car drivers and 5.3% on public transport, an above-average rail share for Perth middle-ring but still subordinate to the car. Volunteering at 13.4% and IRSAD decile 4 confirm a settled, modest suburb where the rail upgrade is the live wildcard.
Drive
87.1%
Public Transport
5.3%
Walk / Cycle
1.2%
Work from Home
N/A
Population Forecast
+0.46%/yr
(+119 people/yr)
EstablishedGrowth here is slow and overseas-fed. Forecast annual growth runs at 0.46% (about 119 persons per year), with the medium projection lifting population from roughly 25,596 in 2026 to 26,189 by 2031, a six-year gain of just 593 persons. The migration breakdown is the explanatory variable: overseas inflow of +473 per year and internal outflow of -282 per year, which is a similar net-overseas pattern to Canning Vale but on a smaller absolute base. The aging trajectory is unmistakable: senior share up 5.5 percentage points over the shift cycle, young share down 0.5 percentage points, working-age share down 2.4 percentage points. Gentrification score sits at 10 (Not gentrifying), consistent with the slow turnover and the fact that rent growth (3.1%) is positive but unspectacular. Real household income has fallen 10.0% in real terms since 2011, the same national headwind hitting most mortgage-belt Perth suburbs.
Historical + Forecast
Hamilton-Perry + Holt smoothing on ERP 2001-2025
Age Cohort Forecast
Primary Driver
Overseas Migration
Net Overseas / yr
+473
Net Internal / yr
-282
Gentrification Signal
Not gentrifying
Net internal outflow -282/yr, Strong overseas inflow +473/yr
National Ranking iPercentile rank among ~15,000 AU suburbs. 90% = higher than 90% of suburbs
How Thornlie compares to ~15,000 Australian suburbs
Frequently Asked Questions
Is Thornlie a good suburb to live in?
Yes for families needing a four-bedroom detached house with a rail station nearby. 91.1% of dwellings are separate houses, 52.9% have four or more bedrooms, and Thornlie station anchors the end of the Thornlie line with a planned Cockburn extension. Median age 38 (2 years below national) and seven schools inside the suburb support a family demographic. Trade-off: SEIFA IRSAD decile 4 sits below the state average, and Thornlie Senior High ICSEA at 969 is below the 1000 national benchmark.
What is the median house price in Thornlie?
WA price data is unreliable in our brief, but the mortgage-side numbers anchor the affordability picture. Average monthly mortgage repayments sit at $1,625 with a mortgage-to-income ratio of 23.9%, well below the 30% stress line. Affordability has improved from 51.9 in 2011 to 48.4 in 2021, a 3.5 percentage point gain against population growth of only 3.0% over the decade. Weekly rent of $330 (rent-to-income 21.0%) reinforces the entry-affordable profile compared with neighbouring Canning Vale.
What schools are in Thornlie?
Seven schools, with one Catholic, one Islamic independent and five government schools. ICSEA ladder: Sacred Heart Catholic Primary at 1050 (387 enrolments), Australian Islamic College Thornlie at 1019 (733), Forest Crescent Primary at 1011 (627), South Thornlie Primary at 997 (421), Yale Primary at 969 (398), Thornlie Senior High at 969 (1,125) and Thornlie Primary at 941 (470). Total enrolments across the seven sit at 4,161, the public secondary anchor being Thornlie Senior High.
Is Thornlie safe?
Crime statistics are not loaded in our brief, so SEIFA proxies are the available indicator. Thornlie sits at IRSD decile 4 and IRSAD decile 4 nationally, meaning the suburb runs below the national median on both disadvantage indices, lower than Canning Vale next door (IRSAD decile 8). Volunteering at 13.4% sits near the national average, and an overseas-born share of 43.5% with strong family households suggests a settled rather than transient profile.
Is Thornlie good for property investment?
Mixed. The rented share is 21.8% with weekly rent at $330, vacancy at 5.7% (loose by 2025 Perth middle-ring standards) and rent growth of 3.1% over the shift window. Zero approved DAs in the last 12 months means no supply pipeline shock. The structural angle is the Thornlie-Cockburn rail extension: a through-station upgrade would re-rate the four-bedroom stock more than the past decade has, but yield-only investors will find better numbers in Gosnells or Maddington.
How is Thornlie's population changing?
Slow growth with a strong aging signal. Population is forecast to rise from roughly 25,596 in 2026 to 26,189 by 2031, around 0.46% per year or 119 persons. Composition: +473 net overseas migration per year, -282 net internal outflow per year, +5.5 percentage points senior share and -0.5 percentage points young share. Gentrification score 10 (Not gentrifying) confirms a stable established suburb rather than a turnover one, with established owners aging in place and overseas families backfilling.
What languages are spoken in Thornlie?
43.5% of residents were born overseas, 21.9 percentage points above the national rate. The top home languages are Mandarin (559 speakers), Arabic (235), Punjabi (225), Cantonese (220) and Urdu (201), a Southeast Asian and South Asian blend distinct from Reservoir's Italian heritage in Melbourne. Religion splits between Christianity (9,355), Islam (2,686) and Buddhism (944), reflecting the layered Chinese, South Asian and Middle Eastern migrant waves into Gosnells LGA over the past three decades.
Who lives in Thornlie?
Largely working-age and retiring families across a multicultural mix. Median age 38 (2 years below national), 29.6% hold a university degree (close to national), and average household size is 2.7 versus 2.5 nationally. Couples with children make up 8,259 of 19,602 families, couples without children another 4,721. SEIFA IER decile 6 reflects dual-earner full-time work, while IEO decile 4 and IRSAD decile 4 show educational credentials lag household economic outcomes.
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.
Explore Thornlie on the Map
View parcels, zoning overlays, DA applications, schools and more.
Open Interactive Map