Castlecrag

Castlecrag is positioned among the lower quartile of areas assessed nationally for population growth based on AreaSearch's assessment of recent, and medium term trends

As of May 2026, the estimated population of Castlecrag is around 3,189, reflecting a growth of 224 people since the 2021 Census. This increase represents a 7.6% rise from the previous population count of 2,965. The current population estimate of 3,186 by AreaSearch is based on examination of the latest ERP data release by the ABS in June 2025 and validation of three new addresses since the Census date. Castlecrag's population density stands at 2,111 persons per square kilometer, exceeding the average seen across national locations assessed by AreaSearch. The suburb's growth rate of 7.6% since the 2021 census surpassed both the SA4 region (5.9%) and the state level, positioning it as a growth leader in the region. Overseas migration was identified as the primary driver for population gains during recent periods.

For projections, AreaSearch adopts ABS/Geoscience Australia projections released in 2024 with a base year of 2022 for each SA2 area. For areas not covered by this data, NSW State Government's SA2 level projections released in 2022 with a base year of 2021 are utilised. Growth rates by age group from these aggregations are applied to all areas for the years 2032 to 2041. Looking ahead, Castlecrag is projected to increase its population by just below the median of statistical areas analysed by AreaSearch, with an expected expansion of 122 persons to reach a total of 3,311 by 2041, reflecting a 3.7% increase over the 16-year period.

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

AreaSearch analysis of ABS building approval numbers indicates Castlecrag has seen approximately 10 new homes approved annually over the past five financial years. This totals an estimated 54 homes from FY-21 to FY-25. So far in FY-26, 45 approvals have been recorded. The average number of people moving to the area for each dwelling built has been around 0.4 per year over these past five financial years.

This suggests new construction is matching or outpacing demand, providing more options for buyers and potentially enabling population growth beyond current expectations. Developers are focusing on the premium market, with an average expected construction cost of $1,352,000 per dwelling. There have been $109,000 in commercial approvals this financial year, indicating a predominantly residential focus. Compared to Greater Sydney and nationally, Castlecrag shows approximately 56% of the construction activity per person, placing it among the 56th percentile of areas assessed. This activity is below average nationally, reflecting the area's maturity and possible planning constraints.

Recent construction comprises 54.0% standalone homes and 46.0% townhouses or apartments, offering a wider range of medium-density options. This marks a significant shift from existing housing patterns, which are currently 97.0% houses. The location has approximately 279 people per dwelling approval, indicating potential room for growth. According to the latest AreaSearch quarterly estimate, Castlecrag is expected to grow by 119 residents through to 2041. At current development rates, new housing supply should comfortably meet demand, providing good conditions for buyers and potentially supporting population growth beyond current projections.

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

No infrastructure changes or major projects were identified by AreaSearch that could impact the area. Key projects included Heart Of Willoughby, Beaches Link Tunnel, North Sydney to Northern Beaches Capacity Improvements, and Northern Beaches Housing Reforms Implementation.

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Employment performance in Castlecrag exceeds national averages across key labour market indicators

Castlecrag has an educated workforce with notable representation in the technology sector. Its unemployment rate was 3.7% as of December 2025, lower than Greater Sydney's 4.2%. Employment growth over the past year was estimated at 2.5%.

As of December 2025, 1,723 residents were employed with an unemployment rate 0.5% below Greater Sydney's. Workforce participation was 65.5%, below Greater Sydney's 68.8%. Sixty-five percent of residents worked from home according to Census responses, potentially influenced by Covid-19 lockdowns. Employment is concentrated in professional & technical (2.1 times the regional average), finance & insurance, and health care & social assistance sectors.

Construction employment was lower at 4.8% compared to the regional average of 8.6%. Limited local employment opportunities are suggested by resident-to-working population ratios. Between December 2024 and December 2025, employment increased by 2.5%, labour force by 3.1%, raising unemployment by 0.5 percentage points. This compares to Greater Sydney's employment growth of 2.2% and unemployment rise. Jobs and Skills Australia forecasts national employment growth at 6.6% over five years and 13.7% over ten years. Applying these projections to Castlecrag's industry mix suggests local employment could increase by 8.0% in five years and 15.6% in ten years, though this is a simplified extrapolation for illustrative purposes only.

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

According to AreaSearch's aggregation of the latest postcode level ATO data released on June 30, 2023, Castlecrag had a median income among taxpayers of $81,592 with an average level standing at $192,257. This places Castlecrag in the top percentile nationally and compares to levels of $60,817 and $83,003 across Greater Sydney respectively. Based on Wage Price Index growth of 10.32% since June 30, 2023, current estimates for median income would be approximately $90,012 as of March 2026, with average income estimated at around $212,098 during the same period. The 2021 Census data shows that household, family and personal incomes in Castlecrag rank highly nationally, between the 97th and 99th percentiles. Income analysis reveals that 56.8% of Castlecrag's community (1,811 individuals) earn over $4,000 annually, contrasting with Greater Sydney where the $1,500 - $2,999 bracket leads at 30.9%. The district displays significant affluence with 66.7% earning over $3,000 per week, supporting premium retail and service offerings. After housing costs, residents retain 89.1% of their income, reflecting strong purchasing power. Castlecrag'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

The dwelling structure in Castlecrag, as per the latest Census, consisted of 96.7% houses and 3.3% other dwellings (semi-detached, apartments, 'other' dwellings). In comparison, Sydney metro had 55.9% houses and 44.1% other dwellings. The home ownership level in Castlecrag was 49.1%, with the remaining dwellings either mortgaged (39.0%) or rented (11.9%). The median monthly mortgage repayment in Castlecrag was $4,333, higher than Sydney metro's average of $2,427 and the national average of $1,863. The median weekly rent figure in Castlecrag was recorded at $1,010, substantially above the national figure of $375 but lower than Sydney metro's average of $470.

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

Family households constitute 88.5% of all households, consisting of couples with children (51.3%), couples without children (28.1%), and single parent families (8.3%). Non-family households comprise the remaining 11.5%, with lone person households at 11.1% and group households making up 0.6%. The median household size is 3.0 people, which is larger than the Greater Sydney average of 2.7.

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 broader averages. Among residents aged 15 and above, 59.8% hold university qualifications, compared to 30.4% nationally and 32.2% in NSW. This indicates a significant educational advantage for the area, positioning it well for knowledge-based opportunities. Bachelor degrees are the most common at 37.9%, followed by postgraduate qualifications (17.9%) and graduate diplomas (4.0%).

Technical qualifications comprise 13.6% of achievements, with advanced diplomas at 7.9% and certificates at 5.7%. Educational participation is high, with 33.6% 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, all of which are bus stops. These stops are serviced by 29 different routes that collectively provide 1,231 weekly passenger trips. Transport accessibility is rated as excellent, with residents typically located 187 meters from the nearest transport stop. Most residents commute outward due to Castlecrag being primarily residential. Car remains the dominant mode of transportation at 85%, while bus usage stands at 6%. Vehicle ownership averages 1.7 per dwelling, which is above the regional average.

According to the 2021 Census, a high 65.0% of residents work from home, which may reflect COVID-19 conditions. Service frequency averages 175 trips per day across all routes, equating 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

AreaSearch's assessment of Castlecrag's health outcomes shows excellent results. Mortality rates and chronic condition prevalence were very low across all age groups. Private health cover was exceptionally high at approximately 102% of the total population (3,266 people), compared to Greater Sydney's 59.9% and the national average of 55.7%.

The most common medical conditions were arthritis and asthma, affecting 5.7% each of residents. 77.3% declared themselves completely clear of medical ailments, higher than Greater Sydney's 74.6%. Castlecrag has 19.5% (621 people) aged 65 and over, higher than Greater Sydney's 15.5%. Health outcomes among seniors are strong, broadly in line with the general population nationally.

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, surveyed in June 2016, had a higher linguistic diversity than most local areas, with 19.3% of residents speaking a language other than English at home. In terms of birthplace, 32.6% were born overseas. Christianity was the dominant religion, at 49.2%.

Judaism, however, was overrepresented compared to Greater Sydney, comprising 2.6% versus 0.8%. The top three ancestral groups were English (25.8%, regional average 19.0%), Australian (19.4%) and Irish (9.7%). Some ethnic groups showed notable discrepancies: Hungarian (1.1% vs regional 0.3%), French (1.0% vs 0.5%) and Polish (1.1% vs 0.6%) were more prevalent in Castlecrag than the regional averages.

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

The median age in Castlecrag is 46 years, which is notably higher than Greater Sydney's average of 37 years and also exceeds the Australian median of 38 years. Compared to Greater Sydney, the 15-24 age cohort is over-represented at 23.5% locally, while the 25-34 age group is under-represented at 4.6%. The concentration of the 15-24 age group in Castlecrag is well above the national average of 12.7%. Between the 2021 Census and the present day, the area has become younger, with the median age dropping from 47 years to 46 years. Specifically, the percentage of the population aged 15-24 increased from 15.9% to 23.5%, while the percentage of those aged 75-84 grew from 5.0% to 6.2%. Conversely, the percentage of those aged 5-14 declined from 14.9% to 11.8%, and the percentage of those aged 45-54 dropped from 18.9% to 16.5%. Population forecasts for 2041 indicate significant demographic changes in Castlecrag, with the 45-54 age cohort projected to expand considerably by 273 people (52%), from 526 to 800. Conversely, both the 0-4 and 35-44 age groups are expected to see reduced numbers.