Castlecrag

Castlecrag has shown very soft population growth performance across periods assessed by AreaSearch

Based on analysis of ABS population updates for the broader area, and new addresses validated by AreaSearch, Castlecrag's estimated population is around 3,094 as of Nov 2025. This reflects an increase of 129 people (4.4%) since the 2021 Census, which reported a population of 2,965 people. The change is inferred from the resident population of 3,093 estimated by AreaSearch following examination of the latest ERP data release by the ABS in June 2024 and an additional three validated new addresses since the Census date. This level of population equates to a density ratio of 2,049 persons per square kilometer, which is above the average seen across national locations assessed by AreaSearch. Castlecrag's 4.4% growth since census positions it within 1.3 percentage points of the SA4 region (5.7%), demonstrating competitive growth fundamentals. Population growth for the area was primarily driven by overseas migration, which was essentially the sole driver of population gains during recent periods.

AreaSearch is adopting ABS/Geoscience Australia projections for each SA2 area, as released in 2024 with 2022 as the base year. For any SA2 areas not covered by this data, AreaSearch is utilising the NSW State Government's SA2 level projections, as released in 2022 with 2021 as the base year. Growth rates by age group from these aggregations are also applied to all areas for years 2032 to 2041. Looking at population projections moving forward, over this period, projections indicate a decline in overall population, with the Castlecrag statistical area's population expected to reduce by 75 persons by 2041 according to this methodology. However, growth across specific age cohorts is anticipated, led by the 85 and over age group, which is projected to expand by 77 people.

AreaSearch assessment of residential development drivers sees a low level of activity in Castlecrag, placing the area among the bottom 25% of areas assessed nationally

AreaSearch analysis of ABS building approval numbers shows Castlecrag recorded around 11 residential properties granted approval each year over the past five financial years ending FY26. This totals an estimated 58 homes. In FY26 so far, 41 approvals have been recorded. The population has fallen during this period, yet housing supply has remained adequate relative to demand, indicating a well-balanced market with good buyer choice.

New properties are constructed at an average value of $1,352,000, demonstrating a focus on the premium segment. This financial year, $109,000 in commercial approvals have been registered, suggesting minimal commercial development activity. Compared to Greater Sydney, Castlecrag has around two-thirds the rate of new dwelling approvals per person and ranks among the 60th percentile nationally. New building activity comprises 53.0% detached houses and 47.0% townhouses or apartments, showing an increasing blend of attached housing types offering choices across price ranges.

This shift reflects decreasing availability of developable sites and changing lifestyles seeking more diverse, affordable housing options. Castlecrag has around 250 people per approval, indicating a low density area. With population projections showing stability or decline, reduced housing demand pressures are expected, benefiting potential buyers.

Castlecrag has very high levels of nearby infrastructure activity, ranking in the top 20% nationally

No local infrastructure changes or major projects have been identified by AreaSearch that could impact the area. Key projects include Heart Of Willoughby, Sydney Metro City & Southwest, Beaches Link Tunnel, and North Sydney To Northern Beaches Capacity Improvements.

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Despite maintaining a low unemployment rate of 3.7%, Castlecrag has experienced recent job losses, resulting in a below average employment performance ranking when compared nationally

Castlecrag has an educated workforce with notable representation in the technology sector. Its unemployment rate is 3.7%, as per AreaSearch's statistical area data aggregation.

As of September 2025, 1,559 residents are employed, with an unemployment rate of 4.2% below Greater Sydney's rate. Workforce participation stands at 62.4%. Dominant employment sectors include professional & technical, finance & insurance, and health care & social assistance. Professional & technical jobs are particularly concentrated, being 2.1 times the regional average.

However, construction employs only 4.8% of local workers, below Greater Sydney's 8.6%. The area appears to have limited local employment opportunities, indicated by Census data comparing working population and resident population. Between September 2024 and September 2025, Castlecrag's labour force remained stable while employment declined by 0.5%, raising the unemployment rate by 0.5 percentage points. In contrast, Greater Sydney saw employment rise by 2.1% and a labour force growth of 2.4%. State-level data to 25-Nov-25 shows NSW employment contracted by 0.03%, with an unemployment rate of 3.9%, compared to the national rate of 4.3%. Jobs and Skills Australia's projections forecast national employment growth of 6.6% over five years and 13.7% over ten years, but these vary significantly between sectors. Applying these projections to Castlecrag's employment mix suggests local employment could increase by 8.0% over five years and 15.6% over ten years.

The economic profile demonstrates exceptional strength, placing the area among the top 10% nationally based on comprehensive AreaSearch income analysis

In AreaSearch's latest postcode level ATO data for financial year 2023, Castlecrag's median income among taxpayers is $81,592, with an average of $192,257. This places it in the top percentile nationally, compared to Greater Sydney's median of $60,817 and average of $83,003. Based on Wage Price Index growth of 8.86% since financial year 2023, current estimates for Castlecrag would be approximately $88,821 (median) and $209,291 (average) as of September 2025. According to the 2021 Census, household, family, and personal incomes in Castlecrag rank highly nationally, between the 97th and 99th percentiles. The income brackets show that the $4000+ bracket dominates with 56.8% of residents (1,757 people), differing from regional patterns where the $1,500 - 2,999 bracket dominates with 30.9%. This indicates a substantial proportion of high earners (66.7% above $3,000/week) in Castlecrag, reflecting strong economic capacity throughout the district. After housing costs, residents retain 89.1% of their income, demonstrating strong purchasing power and the area's SEIFA income ranking places it in the 10th decile.

Castlecrag is characterized by a predominantly suburban housing profile, with above-average rates of outright home ownership

In Castlecrag, as per the latest Census evaluation, 96.7% of dwellings were houses, with the remaining 3.3% consisting of semi-detached homes, apartments, and other types. This contrasts with Sydney metropolitan area's figures of 41.1% houses and 58.9% other dwellings. Home ownership in Castlecrag stood at 49.1%, while mortgaged properties accounted for 39.0% and rented dwellings made up 11.9%. The median monthly mortgage repayment in the area was $4,333, surpassing Sydney metro's average of $3,033. Meanwhile, the median weekly rent figure in Castlecrag was recorded at $1,010, compared to Sydney metro's $560. Nationally, Castlecrag's mortgage repayments were significantly higher than the Australian average of $1,863, while rents were substantially above the national figure of $375.

Castlecrag features high concentrations of family households, with a higher-than-average median household size

Family households account for 88.5% of all households, including 51.3% couples with children, 28.1% couples without children, and 8.3% single parent families. Non-family households make up the remaining 11.5%, with lone person households at 11.1% and group households comprising 0.6%. The median household size is 3.0 people, larger than the Greater Sydney average of 2.5.

Educational achievement in Castlecrag places it within the top 10% nationally, reflecting strong academic performance and high qualification levels across the community

Castlecrag's educational attainment is notably higher than national and state averages. Among residents aged 15+, 59.8% possess university qualifications, compared to Australia's 30.4% and NSW's 32.2%. Bachelor degrees are the most common at 37.9%, followed by postgraduate qualifications (17.9%) and graduate diplomas (4.0%). Technical qualifications account for 13.6%, with advanced diplomas at 7.9% and certificates at 5.7%.

Educational participation is high, with 33.6% of residents currently enrolled in formal education. This includes 12.8% in secondary education, 9.3% in primary education, and 7.9% pursuing tertiary education.

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

Castlecrag has 19 active public transport stops operating within its boundaries. All these stops are served by buses, with a total of 29 individual routes in operation. These routes collectively facilitate 1,231 weekly passenger trips.

The accessibility to public transport is rated excellent, with residents typically located just 187 meters from the nearest stop. On average, there are 175 trips per day across all routes, which translates to approximately 64 weekly trips per individual stop.

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

Castlecrag has excellent health outcomes, with very low prevalence of common health conditions across all age groups. The rate of private health cover is exceptionally high at approximately 102% of the total population (3,169 people), compared to 79.5% in Greater Sydney and a national average of 55.7%. The most prevalent medical conditions are arthritis and asthma, affecting 5.7% and 5.7% of residents respectively.

A significant majority, 77.3%, report being completely free from medical ailments, slightly lower than the 78.0% in Greater Sydney. Castlecrag has a higher proportion of seniors aged 65 and over at 20.2% (624 people), compared to 15.7% in Greater Sydney. Despite this, health outcomes among seniors are strong and broadly align with the general population's health profile.

The level of cultural diversity witnessed in Castlecrag was found to be above average when compared nationally for a number of language and cultural background related metrics

Castlecrag's population was found to be more culturally diverse than most local markets, with 19.3% speaking a language other than English at home and 32.6% born overseas. Christianity was the predominant religion in Castlecrag, comprising 49.2% of its population. Notably, Judaism was overrepresented in Castlecrag compared to Greater Sydney, making up 2.6% versus 1.0%.

The top three ancestry groups were English at 25.8%, Australian at 19.4%, and Irish at 9.7%. Some ethnic groups showed significant differences: Hungarian (1.1% vs regional 0.4%), French (1.0% vs 0.7%), and Polish (1.1% vs 0.8%) were notably overrepresented in Castlecrag.

Castlecrag hosts an older demographic, ranking in the top quartile nationwide

Castlecrag's median age is 47 years, which is higher than Greater Sydney's average of 37 years and exceeds the national average of 38 years. The 45-54 age group comprises 17.6% of Castlecrag's population, compared to Greater Sydney's percentage, while the 25-34 cohort makes up only 4.0%. This concentration in the 45-54 age group is higher than the national average of 12.1%. According to post-2021 Census data, the 15-24 age group increased from 15.9% to 18.3%, and the 75-84 cohort grew from 5.0% to 6.4%. Conversely, the 5-14 age group decreased from 14.9% to 13.0%, and the 35-44 cohort fell from 9.1% to 7.8%. Demographic modeling indicates significant changes in Castlecrag's age profile by 2041. The 85+ cohort is projected to grow by 110%, adding 74 residents, reaching a total of 143. Residents aged 65 and above will drive 70% of population growth, highlighting demographic aging trends. Meanwhile, population declines are projected for the 25-34 and 35-44 age groups.