Castle Cove - Northbridge

Castle Cove - Northbridge 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, Castle Cove - Northbridge's population is approximately 13,629, reflecting a 1.4% increase from the 2021 Census figure of 13,440 people. This growth is inferred from ABS estimates of 13,592 in June 2025 and an additional 28 validated new addresses since then. The population density stands at 1,774 persons per square kilometer, higher than the average seen across national locations assessed by AreaSearch. Overseas migration was the primary driver for this growth. AreaSearch uses ABS/Geoscience Australia projections released in 2024 with a base year of 2022 for SA2 areas covered, and NSW State Government's SA2 level projections from 2022 with a base year of 2021 for areas not covered by ABS data.

These projections indicate a decline in overall population to approximately 13,566 by 2041, a decrease of 63 persons. However, specific age cohorts are expected to grow, notably the 85 and over age group projected to expand by 518 people during this period.

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

Castle Cove - Northbridge has seen approximately 34 new homes approved annually over recent years. Between the financial years FY-21 to FY-25, a total of 171 homes were approved, with an additional 73 approved so far in FY-26. Despite population decline during this period, new supply appears to have kept pace with demand, offering buyers good choice.

The average expected construction cost value of new dwellings is $1,242,000, indicating a focus on the premium market and high-end developments. Commercial approvals registered in FY-26 amount to $653,000, suggesting minimal commercial development activity in the area. Compared to Greater Sydney, Castle Cove - Northbridge records significantly lower building activity, at 60.0% below the regional average per person. This scarcity of new homes typically strengthens demand and prices for existing properties. The area's building activity is also below national averages, reflecting its maturity and possible planning constraints. New building activity consists of approximately 55.0% detached houses and 45.0% medium and high-density housing, featuring an increasing blend of attached housing types.

This shift from the area's existing housing composition (currently 84.0% houses) indicates decreasing availability of developable sites and reflects changing lifestyles and demand for more diverse, affordable housing options. With around 363 people per dwelling approval, Castle Cove - Northbridge shows a developed market. Population projections indicating stability or decline suggest reduced housing demand pressures in the area, potentially benefiting potential buyers.

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

Area infrastructure changes significantly influence local performance. AreaSearch identified 35 projects potentially impacting the area. Notable ones are Northbridge Public School Upgrade, Flo Northbridge by WINIM, Aurora Willoughby, and The Quarry Naremburn. Relevant projects are listed below for further detail.

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

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AreaSearch assessment positions Castle Cove - Northbridge ahead of most Australian regions for employment performance

Castle Cove - Northbridge has a highly educated workforce with notable representation in the technology sector. Its unemployment rate was 2.8% as of December 2025. There was an estimated employment growth of 0.7% over the past year.

As of December 2025, 6,850 residents were employed, with an unemployment rate of 1.4%, which is below Greater Sydney's rate of 4.2%. Workforce participation in Castle Cove - Northbridge was 62.1%, compared to Greater Sydney's 68.8%. According to Census responses, 64.8% of residents worked from home, though Covid-19 lockdown impacts should be considered. The leading employment industries among residents were professional & technical, finance & insurance, and health care & social assistance.

The area showed strong specialization in professional & technical services with an employment share of 1.9 times the regional level. Conversely, construction had lower representation at 4.9% versus the regional average of 8.6%. Employment levels increased by 0.7% during the year to December 2025, while labour force increased by 1.0%, causing the unemployment rate to rise by 0.3 percentage points. In contrast, Greater Sydney experienced employment growth of 2.2% and labour force growth of 2.3%. Jobs and Skills Australia's national employment forecasts from May-25 suggest that national employment is forecast to expand by 6.6% over five years and 13.7% over ten years, with varying growth rates between industry sectors. Applying these projections to Castle Cove - Northbridge's employment mix suggests local employment should increase by 7.7% over five years and 15.2% over ten years.

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

AreaSearch's aggregation of latest postcode level ATO data released for financial year ending 2023 shows Castle Cove - Northbridge SA2 had median taxpayer income of $77,695 and average income of $173,909. Nationally, these figures are exceptionally high, compared to Greater Sydney's $60,817 and $83,003 respectively. Based on Wage Price Index growth of 10.32% since financial year ending 2023, current estimates for March 2026 would be approximately $85,713 (median) and $191,856 (average). According to 2021 Census figures, incomes in Castle Cove - Northbridge rank highly nationally, between the 96th and 99th percentiles for household, family, and personal incomes. Income analysis reveals that 49.9% of residents (6,800 people) fall into the $4000+ bracket, differing from regional patterns where the $1,500 - 2,999 bracket dominates at 30.9%. Economic strength is evident with 59.8% of households achieving high weekly earnings exceeding $3,000, supporting elevated consumer spending. After housing costs, residents retain 88.0% of income, reflecting strong purchasing power and the area's SEIFA income ranking places it in the 10th decile.

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

The dwelling structure in Castle Cove - Northbridge, as per the latest Census, consisted of 84.5% houses and 15.5% other dwellings (semi-detached, apartments, 'other' dwellings). This compares to Sydney metro's 55.9% houses and 44.1% other dwellings. The home ownership level in Castle Cove - Northbridge was 49.8%, with the remaining dwellings either mortgaged (34.8%) or rented (15.4%). The median monthly mortgage repayment in the area was $4,333, higher than Sydney metro's average of $2,427. The median weekly rent figure was recorded at $850, compared to Sydney metro's $470. Nationally, Castle Cove - Northbridge's mortgage repayments were significantly higher than the Australian average of $1,863, while rents were substantially above the national figure of $375.

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

Family households account for 83.1% of all households, including 48.3% couples with children, 26.3% couples without children, and 7.9% single parent families. Non-family households constitute the remaining 16.9%, with lone person households at 15.8% and group households comprising 1.1%. The median household size is 2.9 people, larger than the Greater Sydney average of 2.7.

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

Educational attainment in Castle Cove-Northbridge is notably higher than broader Australian benchmarks. Among residents aged 15 and above, 57.1% hold university qualifications, compared to 30.4% nationally and 32.2% in New South Wales (NSW). This educational advantage positions the area favourably for knowledge-based opportunities. Bachelor degrees are the most common at 36.1%, followed by postgraduate qualifications at 17.1% and graduate diplomas at 3.9%.

Vocational pathways account for 16.7% of qualifications among those aged 15 and above, with advanced diplomas at 9.6% and certificates at 7.1%. Educational participation is high, with 33.6% of residents currently enrolled in formal education. This includes 11.7% in secondary education, 11.0% in primary education, and 6.8% pursuing tertiary education.

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

Castle Cove - Northbridge has 115 active transport stops serving a mix of bus routes. These stops are served by 58 individual routes, facilitating 3,601 weekly passenger trips. The area's transport accessibility is rated excellent, with residents located an average of 151 meters from the nearest stop. As a primarily residential area, most commutes are outward-bound. Car remains the dominant mode at 80%, followed by bus at 7% and walking at 5%. Vehicle ownership averages 1.6 per dwelling, higher than the regional average.

According to the 2021 Census, 64.8% of residents work from home, which may reflect COVID-19 conditions. Service frequency averages 514 trips per day across all routes, equating to approximately 31 weekly trips per individual stop. The accompanying map displays the 100 nearest stops to the location's centrepoint.

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

Health outcomes data shows excellent results for Castle Cove - Northbridge based on AreaSearch's evaluation of mortality rates and chronic condition prevalence, with very low prevalence of common health conditions across all age groups. The rate of private health cover is exceptionally high at approximately 91% of the total population (12,361 people), compared to 59.9% in Greater Sydney and a national average of 55.7%. The most prevalent medical conditions are arthritis and asthma, affecting 6.4 and 6.2% of residents respectively.

A total of 76.0% of residents report being completely clear of medical ailments, compared to 74.6% in Greater Sydney. The area has 22.5% of residents aged 65 and over (3,065 people), higher than the 15.5% in Greater Sydney. Health outcomes among seniors are particularly strong, with national rankings broadly in line with the general population.

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

Castle Cove-Northbridge's population showed higher cultural diversity than most local areas, with 22.6% speaking languages other than English at home and 33.2% born overseas. Christianity was the predominant religion, comprising 52.4%. Judaism was overrepresented at 2.0%, compared to Greater Sydney's 0.8%.

The top three ancestral groups were English (24.4%), Australian (20.1%), and Chinese (10.8%). Notable divergences existed for Hungarian (0.7% vs regional 0.3%), French (0.9% vs 0.5%), and Russian (0.6% vs 0.4%) groups.

Castle Cove - Northbridge hosts a notably older demographic compared to the national average

The median age in Castle Cove - Northbridge is 45 years, significantly higher than Greater Sydney's average of 37 years and Australia's average of 38 years. Compared to Greater Sydney, Castle Cove - Northbridge has a higher proportion of residents aged 55-64 (14.1%) but fewer residents aged 25-34 (5.5%). According to the 2021 Census, the population aged 15-24 increased from 13.2% to 16.2%, while the population aged 75-84 grew from 6.4% to 8.1%. Conversely, the population aged 5-14 decreased from 16.0% to 13.6%, and the population aged 35-44 dropped from 10.9% to 9.5%. By 2041, demographic projections show significant shifts in Castle Cove - Northbridge's age structure. The population aged 85+ is projected to grow by 101% (484 people), reaching 966 from 481. Notably, the combined age groups of 65+ will account for 71% of total population growth, reflecting the area's aging demographic profile. In contrast, both the populations aged 35-44 and 0-4 are projected to decrease in numbers.