Castle Hill - South
Statistical Area - sa2

Population growth drivers in Castle Hill - South are strong compared to national averages based on AreaSearch's ranking of recent, and medium to long-term trends

Castle Hill - South's population was around 10,789 as of August 2025. This showed an increase of 370 people since the 2021 Census, which reported a population of 10,419. The change was inferred from ABS data showing an estimated resident population of 10,787 in June 2024 and an additional 15 validated new addresses since the Census date. This resulted in a density ratio of 2,612 persons per square kilometer, placing Castle Hill - South in the upper quartile relative to national locations assessed by AreaSearch. Over the past decade, from 2011 to 2021, Castle Hill - South demonstrated resilient growth patterns with a compound annual growth rate of 1.1%, outpacing the SA3 area. Population growth was primarily driven by overseas migration contributing approximately 79.9% of overall population gains during recent periods.

AreaSearch is adopting ABS/Geoscience Australia projections for each SA2 area, released in 2024 with a base year of 2022. For areas not covered by this data, AreaSearch utilises NSW State Government's SA2 level projections released in 2022 with a base year of 2021. Growth rates by age group from these aggregations are applied to all areas for years 2032 to 2041. Looking ahead, Castle Hill - South is projected to have above median population growth, with an expected increase of 1,595 persons to 2041 based on the latest population numbers, recording a gain of 14.8% in total over the 17 years.

Residential development activity is lower than average in Castle Hill - South according to AreaSearch's national comparison of local real estate markets

Castle Hill - South has seen approximately 19 dwellings granted development approval annually. Over the past five financial years, from FY21 to FY25, 99 homes were approved, with an additional 4 approved so far in FY26. On average, each dwelling constructed over these years accommodated around 4.1 new residents yearly.

This supply has significantly lagged demand, leading to increased buyer competition and pricing pressures. The average construction value of new dwellings was $682,000, slightly above the regional average, indicating a focus on quality developments. In FY26, commercial approvals totaled $7.4 million, reflecting the area's predominantly residential nature. Compared to Greater Sydney, Castle Hill - South has shown significantly reduced construction activity, 80.0% below the regional average per person, which typically strengthens demand and prices for existing properties. This activity is also below national averages, suggesting an established area with potential planning constraints.

New building activity comprised approximately 71.0% standalone homes and 29.0% attached dwellings, preserving the area's suburban character and attracting space-seeking buyers. With around 948 people per approval, Castle Hill - South demonstrates a mature, established population. By 2041, population forecasts indicate an increase of 1,593 residents. If current development rates persist, housing supply may not keep pace with population growth, potentially intensifying buyer competition and supporting stronger price growth.

Castle Hill - South has very high levels of nearby infrastructure activity, ranking in the top 10% nationally

The performance of an area can significantly be influenced by changes in local infrastructure, major projects, and planning initiatives. AreaSearch has identified a total of 19 projects that are expected to impact the area. Notable projects include Hills Shire Council's Delivery Program and Operational Plan for Infrastructure Works from 2024 to 2025, Chapman Gardens developed by CG Group, Castle Hill Panorama, and Hills Showground Village by Deicorp. The following list details those projects that are likely to be most relevant.

Professional plan users can use the search below to filter and access additional projects.

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Employment performance in Castle Hill - South has been broadly consistent with national averages

Castle Hill - South has a highly educated workforce with professional services showing strong representation. The unemployment rate was 3.6% as of June 2025, which is below Greater Sydney's rate of 4.2%.

Employment growth over the past year was estimated at 2.1%. As of June 2025, 5,925 residents were in work and workforce participation was 63.8%, slightly higher than Greater Sydney's 60.0%. Leading employment industries among residents include professional & technical services, health care & social assistance, and retail trade.

However, transport, postal & warehousing employs only 2.7% of local workers, compared to Greater Sydney's 5.3%. The area appears to offer limited local employment opportunities, as indicated by the count of Census working population versus resident population. Between June 2024 and June 2025, employment levels increased by 2.1%, while labour force increased by 3.1%, causing the unemployment rate to rise by 0.9 percentage points. In comparison, Greater Sydney recorded employment growth of 2.6% and unemployment rose by 0.3 percentage points during the same period. Jobs and Skills Australia's national employment forecasts from May 2025 project an expansion of 6.6% over five years and 13.7% over ten years. Applying these projections to Castle Hill - South's employment mix suggests local growth of approximately 7.0% over five years and 14.1% over ten years, though these are simple weighting extrapolations for illustrative purposes and do not account for localised population projections.

Income metrics indicate excellent economic conditions, with the area achieving higher performance than 75% of national locations assessed by AreaSearch

Castle Hill - South's median income among taxpayers was $58,774 in financial year 2022. The average income stood at $86,729 during the same period. These figures compare to Greater Sydney's median income of $56,994 and average income of $80,856 respectively. Based on a Wage Price Index growth of 12.61% since financial year 2022, estimated incomes for September 2025 would be approximately $66,185 (median) and $97,666 (average). According to Census 2021 income data, Castle Hill - South ranks highly nationally in terms of household, family, and personal incomes, between the 77th and 90th percentiles. The largest income segment comprises 30.2% earning $1,500 - $2,999 weekly, with a total of 3,258 residents falling into this bracket. Notably, 41.3% earn above $3,000 weekly, reflecting areas of prosperity that contribute to robust local economic activity. High housing costs consume 16.7% of income in Castle Hill - South. Despite this, strong earnings place disposable income at the 89th percentile nationally, and the area's SEIFA income ranking places it in the 9th decile.

Castle Hill - South is characterized by a predominantly suburban housing profile, with a higher proportion of rental properties than the broader region

In Castle Hill - South, as per the latest Census evaluation, 70.9% of dwellings were houses while 29.0% consisted of other types such as semi-detached properties, apartments, and 'other' dwellings. This differs from Sydney metropolitan area's figures which stood at 78.2% houses and 21.8% other dwellings respectively. Home ownership in Castle Hill - South was recorded at 33.9%, with mortgaged dwellings accounting for 36.0% and rented ones making up 30.2%. The median monthly mortgage repayment in the area was $3,000, aligning with Sydney metro's average, while the median weekly rent figure stood at $550 compared to Sydney metro's $3,000 and $580 respectively. Nationally, Castle Hill - South's mortgage repayments were significantly higher than the Australian average of $1,863, and rents were substantially above the national figure of $375.

Castle Hill - South features high concentrations of family households, with a lower-than-average median household size

Family households constitute 83.9 percent of all households, including 46.1 percent couples with children, 26.5 percent couples without children, and 10.1 percent single parent families. Non-family households account for the remaining 16.1 percent, with lone person households at 14.0 percent and group households comprising 2.1 percent of the total. The median household size is 2.9 people, which is smaller than the Greater Sydney average of 3.0.

Castle Hill - South demonstrates exceptional educational outcomes, ranking among the top 5% of areas nationally based on AreaSearch's comprehensive analysis of qualification and performance metrics

Castle Hill - South's residents aged 15+ have higher university qualification rates (47.8%) compared to Australia (30.4%) and NSW (32.2%). Bachelor degrees are most common (29.6%), followed by postgraduate qualifications (15.0%) and graduate diplomas (3.2%). Vocational pathways account for 24.2%, with advanced diplomas at 11.1% and certificates at 13.1%. Educational participation is high, with 31.5% of residents currently enrolled in formal education: primary (10.6%), secondary (8.8%), and tertiary (6.4%).

The area's 3 schools have a combined enrollment of 466 students. Castle Hill - South has significant socio-educational advantages and academic achievement, with an ICSEA score of 1135. Education provision is balanced, with 2 primary and 1 secondary school serving distinct age groups. Local school capacity is limited (4.3 places per 100 residents vs regional average of 17.4), leading many families to travel for schooling.

Transport servicing is high compared to other areas nationally based on assessment of service frequency, route connectivity and accessibility

Castle Hill - South has 43 active transport stops, all of which are bus stops. These stops are served by 79 different routes that together facilitate 4,254 weekly passenger trips. The area's transport accessibility is rated as excellent, with residents typically located just 163 meters from the nearest stop.

On average, there are 607 trips per day across all routes, which amounts to approximately 98 weekly trips per individual stop.

Castle Hill - South's residents boast exceedingly positive health performance metrics with very low prevalence of common health conditions across all age groups

Health outcomes data for Castle Hill - South shows very low prevalence of common health conditions across all age groups. The rate of private health cover is exceptionally high at approximately 64% of the total population (6,883 people), compared to the national average of 55.3%.

The most common medical conditions are arthritis and asthma, affecting 5.7% and 5.7% of residents respectively. A total of 76.8% of residents declare themselves completely clear of medical ailments, compared to 75.9% across Greater Sydney. As of 2021, 18.7% of residents are aged 65 and over (2,015 people). Health outcomes among seniors are particularly strong, broadly in line with the general population's health profile.

Castle Hill - South is among the most culturally diverse areas in the country based on AreaSearch assessment of a range of language and cultural background related metrics

Castle Hill-South has a high level of cultural diversity, with 45.4% of its population speaking a language other than English at home and 46.7% born overseas. Christianity is the predominant religion in Castle Hill-South, accounting for 50.4% of its population. Hinduism stands out as overrepresented, comprising 6.6% compared to Greater Sydney's 8.6%.

The top three ancestry groups are English (16.5%), Chinese (16.3%), and Australian (15.7%). Notably, Korean is overrepresented at 3.2% compared to the regional average of 2.3%, Indian at 5.7% versus 7.5%, and Sri Lankan at 0.7% versus 1.0%.

Castle Hill - South's population is slightly older than the national pattern

Castle Hill - South has a median age of 40, which is higher than Greater Sydney's figure of 37 and Australia's figure of 38 years. The 45-54 cohort is notably over-represented in Castle Hill - South at 14.2%, while the 25-34 year-olds are under-represented at 9.0%. Between 2021 and the present, the population of those aged 15 to 24 has grown from 11.9% to 13.8%, and the 75 to 84 cohort has increased from 5.5% to 6.6%. Conversely, the 25-34 cohort has declined from 10.2% to 9.0%, and the 5-14 group has dropped from 14.8% to 13.7%. By 2041, demographic modeling suggests that Castle Hill - South's age profile will change significantly. The 85+ age cohort is projected to surge dramatically, increasing by 396 people (155%) from 255 to 652. Notably, the combined 65+ age groups are expected to account for 59% of total population growth, reflecting the area's aging demographic profile. Meanwhile, the 0-4 and 35-44 cohorts are expected to experience population declines.