St Clair
Detached housing defines St Clair: 98.5% of dwellings are separate houses, a much higher share than the 0.5% apartment base. The suburb has 19,942 residents, a median age of 36, and household income at the 77.8 percentile nationally, so it reads as a family-heavy, above-average income pocket in western Sydney. Compared with St Marys and Colyton, St Clair is more car-oriented and owner-occupied, with 47.1% of homes mortgaged and 31.2% owned outright.
Population
19,942
Median Age
36.0
Household IncomeiMedian weekly household income (ABS Census)
$2,067/wk
DAs (12 months)iDevelopment Applications lodged in the past year
122
Median House
$1.1M
2024-2025 (PSI derived)
Homebuyers are mainly buying land and family space, because 98.5% of homes are separate houses and 45.6% have 4 or more bedrooms. The median house price is $1,075,000, while the 2025 price point reached $1,120,000, higher than the 2024 level of $995,000. Mortgage repayments of $2,167 per month sit at 24.2% of income, below the local rent share comparison of 21.3% only by a small margin, so budgets still need discipline even without a stress flag.
For Buyers
Homebuyers are mainly buying land and family space, because 98.5% of homes are separate houses and 45.6% have 4 or more bedrooms. The median house price is $1,075,000, while the 2025 price point reached $1,120,000, higher than the 2024 level of $995,000. Mortgage repayments of $2,167 per month sit at 24.2% of income, below the local rent share comparison of 21.3% only by a small margin, so budgets still need discipline even without a stress flag.
For Investors
Investor demand is shaped by a small rental pool rather than high churn. Renting is 21.7%, lower than the 47.1% mortgaged share, which can limit listing depth but also keeps family renters focused on scarce detached stock. Median rent is $440 per week and vacancy is 2.8%, while rent growth in the shift indicators is 49.0%. With 0 new development approvals in the last 12 months and internal migration averaging +347 people a year, supply pressure is the main support for returns.
Development Activity
Total DAs
584
Last 12 Months
122
YoY ChangeiYear-over-year change in DA lodgements
+8.9%
Avg DA CostiAverage estimated cost per DA in the past year
N/A
Monthly DA Lodgements
DA Categories
Schools in St Clair iICSEA: school advantage index. 1000 = national avg, higher = more advantaged
Holy Spirit Primary School
K-6 · 331 students
Clairgate Public School
K-6 · 409 students
Blackwell Public School
K-6 · 480 students
St Clair Public School
K-6 · 325 students
Banks Public School
K-6 · 417 students
Demographics
St Clair is younger and larger-household than the national pattern. The median age is 36, which is 4.0 years below the national benchmark, and average household size is 3.0, 0.5 above national. Overseas-born residents are 28.3%, or 6.7 percentage points above national, while university attainment is 25.6%, 4.5 points below national. English ancestry leads with 5,340 people, followed by Filipino at 1,089, and Christianity is the largest religion with 11,927 people.
Age Distribution
Bedrooms
Dwelling Structure
98.5%
Houses
0.9%
Townhouse
0.5%
Apartment
Tenure
The housing market is almost entirely detached, with 98.5% separate houses compared with 0.5% apartments and 0.9% semi-detached homes. Prices rose from $995,000 in 2024 to $1,120,000 in 2025, a 12.6% gain, and the latest price is also the peak, with 0.0% fall from peak to latest. Ownership is stable because 31.2% own outright and 47.1% have a mortgage, while 21.7% rent. The 50.5% share of 3-bedroom homes gives upsizers a lower bedroom count than the 45.6% share of 4-plus homes suggests.
Median House Price Trend
Source: State Valuer-General
Mortgage / mo
$2,167
Rent / wk
$440
HH Size
3.0
Personal Income / wk
$849
Vacancy Ratei% of dwellings unoccupied on Census night (ABS 2021)
2.8%
Unoccupied
181
Rent / IncomeiMedian rent as % of household income. Over 30% = housing stress
21.3%
Mortgage / IncomeiMedian mortgage as % of household income. Over 30% = housing stress
24.2%
Community Profile
Languages Spoken at Home
Ancestry
Household Composition
20.4%
Couples, no children
17,560
Total families
Economy & Employment
The local workforce sits above average for income, with household earnings at the 77.8 percentile nationally and median household income of $2,067 a week. Healthcare is the largest industry at 16.2% and 882 workers, ahead of Construction at 12.4% and Education at 10.4%, so employment is tied to essential services and trades. Full-time work is strong at 67.3%, but participation is 55.1% and unemployment is 5.0%. Clerical and admin roles lead occupations with 1,698 workers, higher than Professionals at 1,310.
Unemployment
5.4%
Labour Force
11,332
Unemployed
613
Quarterly Trend
Source: SALM Dec-25
Socio-Economic Indexes (SEIFA)iABS index ranking suburbs from 1 (most disadvantaged) to 10 (most advantaged)
Full-time
67.3%
Part-time
27.7%
Participation
55.1%
Employed
8,254
Occupations
Top Industries
University
25.6%
Postgraduate
5.3%
Born Overseas
28.3%
Dwellings
6,317
Transport to Work
Daily life is built around cars. Car driving accounts for 90.4% of commuting, far higher than public transport at 2.1% and walking or cycling at 1.0%, so access to work and shops is easiest for households with vehicles. There are 0 schools listed inside St Clair, which is lower than school-rich Penrith pockets, so catchment checking matters for families. The upside is space and income resilience: 3.0 people per household and a 77.8 national income percentile support local services and family demand.
Drive
90.4%
Public Transport
2.1%
Walk / Cycle
1.0%
Work from Home
N/A
Population Forecast
+2.54%/yr
(+515 people/yr)
EstablishedGrowth is running faster than a flat established-suburb pattern, with the trend adding 2.54% or 515 people a year. The medium forecast lifts population from 20,438 in 2026 to 23,013 in 2031, compared with 20,292 in 2025. Migration is led by Internal migration, averaging +347 net internal movers a year, above the +197 net overseas figure. The gentrification score is 40 and the stage is Active, while the shift trajectory is Declining young, with the young share down 2.3 points despite 49.0% rent growth.
Historical + Forecast
Hamilton-Perry + Holt smoothing on ERP 2001-2025
Age Cohort Forecast
Primary Driver
Internal Migration
Net Overseas / yr
+197
Net Internal / yr
+347
Gentrification Signal
Active
Net internal migration +347/yr, Accelerating: 13% → 47%
National Ranking iPercentile rank among ~15,000 AU suburbs. 90% = higher than 90% of suburbs
How St Clair compares to ~15,000 Australian suburbs
Frequently Asked Questions
Is St Clair (Penrith - NSW) a good suburb to live in?
St Clair suits households wanting detached homes, with 98.5% separate houses and an average household size of 3.0. It is very car-dependent, with 90.4% driving to work, so it works best for families comfortable with driving.
What is the median house price in St Clair (Penrith - NSW)?
The median house price is $1,075,000. Recent pricing moved from $995,000 in 2024 to $1,120,000 in 2025, a 12.6% rise, placing the latest reading at the market peak.
What schools are in St Clair (Penrith - NSW)?
There are 0 schools listed within St Clair itself. Families should check current catchments and nearby Penrith-area options, especially because 45.6% of homes have 4 or more bedrooms and attract family buyers.
Is St Clair (Penrith - NSW) safe?
A suburb-specific crime rate is not available for St Clair, so safety should be checked through current police maps and inspections. The suburb has 19,942 residents and a strongly car-based commuting pattern at 90.4%.
Is St Clair (Penrith - NSW) good for property investment?
St Clair has investment support from scarce rental stock, with 21.7% renting and vacancy at 2.8%. Median rent is $440 per week, while 0 new development approvals suggest limited immediate supply pressure.
How is St Clair (Penrith - NSW)'s population changing?
Population growth is strong, with the trend adding 2.54% or 515 people a year. The medium forecast rises from 20,438 in 2026 to 23,013 in 2031, led by internal migration averaging +347 people annually.
How to read these comparisons
Phrases like "above the national average" reference the unweighted median across Australian suburbs with more than 1,000 residents, not population-weighted national figures. Suburb-level medians are more useful for ranking suburbs against each other; ABS census headlines are population-weighted (so dominated by Sydney and Melbourne) and can read very differently.
Current baseline (refreshed 2026-05-10): median age 40, university-educated 30.1%, born overseas 21.6%, average household size 2.5 people.
Data sources: ABS 2021 Census (demographics, income, tenure), state Valuer-General (house prices), Department of Jobs SALM (unemployment), ACARA (school ICSEA), state Crime Statistics agencies (offences), council DA portals (development applications). Population forecasts use a Hamilton-Perry cohort model calibrated to ABS ERP.
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