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This analysis uses Suburbs and Localities (SAL) boundaries, which can materially differ from Statistical Areas (SA2) even when sharing the same name.
SAL boundaries are defined by Australia Post and the Australian Bureau of Statistics to represent commonly-known suburb names used in postal addresses.
Statistical Areas (SA2) are designed for census data collection and may combine multiple suburbs or use different geographic boundaries. For comprehensive analysis, consider reviewing both boundary types if available.
est. as @ -- *
2021 Census | -- people
Sales Activity
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Population
Population growth drivers in Mount Colah are slightly above average based on AreaSearch's ranking of recent, and medium term trends
The suburb of Mount Colah's population is estimated at around 8,194 as of May 2026. This reflects an increase of 378 people since the 2021 Census which reported a population of 7,816. The change is inferred from AreaSearch's estimate of 8,176 residents following examination of ABS ERP data release in June 2025 and additional 36 validated new addresses since the Census date. This level of population equates to a density ratio of 740 persons per square kilometer. Mount Colah's growth of 4.8% since the 2021 census exceeded the SA3 area's growth of 4.5%. Population growth was primarily driven by overseas migration contributing approximately 56% 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, and NSW State Government's SA2 level projections where applicable, 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. Based on aggregated SA2-level projections, the suburb is expected to increase by 1,062 persons to 2041, reflecting an increase of 12.7% in total over the 16-year period.
Frequently Asked Questions - Population
Development
Residential development activity is slightly higher than average within Mount Colah when compared nationally
Mount Colah has seen approximately 27 dwelling approvals annually over the past five financial years, totalling an estimated 138 homes. In FY26 so far, there have been 9 approvals. On average, 4.1 people moved to the area per year for each dwelling built between FY21 and FY25. This indicates supply is lagging demand, potentially leading to increased buyer competition and pricing pressures.
New homes are being constructed at an average cost of $428,000, which is higher than regional norms due to quality-focused development. $15.2 million in commercial approvals have been registered this financial year, suggesting balanced commercial development activity in Mount Colah compared to Greater Sydney. However, construction activity has eased recently and is lower than the national average, possibly due to market maturity and development constraints. The majority of new building activity consists of townhouses or apartments (52%), with detached houses making up 48%. This shift from the current housing pattern of 84% houses suggests diminishing developable land availability and a response to evolving lifestyle preferences and affordability needs. The area has an estimated 402 people per dwelling approval, reflecting its quiet development environment.
Mount Colah is projected to grow by 1,044 residents by 2041, according to the latest AreaSearch quarterly estimate. While construction is maintaining a reasonable pace with this growth, increasing population could lead to growing competition among buyers.
Frequently Asked Questions - Development
Development applications around Mount Colah
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SOURCE: Planning portals and council registers, compiled by AreaSearch. Distance & bearing measured from the suburb midpoint.
Infrastructure
Mount Colah has strong levels of nearby infrastructure activity, ranking in the top 40% nationally
Changes in local infrastructure significantly affect an area's performance. AreaSearch has identified five projects that could impact the region. Notable ones are Hornsby Park's transformation from quarry to parklands, Mount Colah Station Upgrade, Arlington Heights Estate, and Berowra Valley National Park Northern Extension. The following list provides details on those most relevant.
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Frequently Asked Questions - Infrastructure
Sydney Metro Northwest
Sydney Metro Northwest is Australia's first fully automated metro rail system. Spanning 36 km from Tallawong to Chatswood, the line features 13 stations, including 8 new stations and 5 converted from the Epping to Chatswood rail link. It features driverless trains, platform screen doors, and turn-up-and-go services every 4 minutes during peak periods. As of 2026, it forms the northern section of the M1 North West & Bankstown Line, which has successfully completed end-to-end testing from Tallawong to Bankstown.
Low and Mid-Rise Housing Policy
Comprehensive NSW state planning reforms designed to increase housing density in well-located areas. The policy mandates mid-rise apartment buildings (3-6 storeys) and low-rise multi-dwelling housing (terraces, townhouses, and dual occupancies) within 800m of 171 high-frequency transport hubs and town centres. As of May 2026, the policy is fully operational following the phased rollout of dual occupancy provisions in July 2024 and mid-rise apartment provisions in early 2025. Recent updates include refined floor space ratios (FSR) and non-refusal standards to streamline local council assessments.
Sydney Metro Program
Australia's largest public transport program, comprising multiple metro lines across Greater Sydney. The M1 City and Southwest line is operating to Sydenham, while the Sydenham to Bankstown conversion is in final testing with weekend closures scheduled from May to July 2026 as the project moves toward trial running and a second-half 2026 opening. Sydney Metro West is a 24 kilometre underground line between Westmead and Hunter Street targeting a 2032 opening, with confirmed stations at Westmead, Parramatta, Sydney Olympic Park, North Strathfield, Burwood North, Five Dock, The Bays, Pyrmont and Hunter Street. Sydney Metro Western Sydney Airport is under construction between St Marys, the new Western Sydney International Airport and Bradfield, with the objective of opening when the airport starts passenger services.
Mariyung Fleet (New Intercity Fleet)
The Mariyung Fleet is a 610-carriage double-deck electric train fleet (D sets) replacing the ageing V-set and Oscar fleets across the NSW intercity network. Delivered by the RailConnect NSW consortium (UGL, Hyundai Rotem, Mitsubishi Electric Australia), the trains feature wider 2x2 seating with arm rests, tray tables and cup holders, charging ports, dedicated luggage, pram and bicycle spaces, accessible toilets, dedicated wheelchair spaces, CCTV, digital information screens and Automatic Selective Door Operation. The fleet operates in 4, 6, 8 or 10-car formations. Passenger services commenced on the Central Coast & Newcastle Line on 3 December 2024, on the Blue Mountains Line on 13 October 2025, and on the South Coast Line on 14 April 2026. The South Coast Line rollout begins with seven 4 and 6-car sets, scaling to 16 trains by 2027 with 8-car sets later in 2026 and 10-car configurations in 2027. The project includes the Kangy Angy Maintenance Facility (operated by UGL on a 15-year contract) and extensive corridor upgrades including platform extensions, signalling modifications, balise installation and overhead wiring works.
Hills Shire Council Infrastructure Delivery Program 2025-2026
The Hills Shire Council's multi-year infrastructure delivery program, with the 2024-25 plan centred on a $162.8 million capital works spend covering roads, parks, paths and community facilities across the rapidly growing Hills Shire. Major works include the $24.4 million four-laning of Annangrove Road between Withers and Windsor Roads, the $20.2 million Withers Road upgrade, and the $28.5 million Boundary Road transformation including a new bridge over Killarney Chain of Ponds Creek. Additional works include the Livvi's Place expansion at Bernie Mullane Sports Complex, a cycleway along Cattai Creek, and shared pathways along Norwest Boulevard. The 2025-26 Delivery Program 2025-2029 has since been adopted, and a draft 2026-27 Hills Shire Plan proposing a $268 million investment has been released for community feedback. Council continues to advocate for $207 million in NSW Government funding to address a critical infrastructure deficit in the Box Hill growth area.
Hornsby Park - from quarry to parklands
Redevelopment of the former Hornsby Quarry and adjoining Old Mans Valley into Hornsby Park, a 60 hectare regional parkland with a quarry lake, lookouts, walking and cycling paths, picnic areas, a field of play and other community recreation facilities delivered in stages.
Mount Colah Station Upgrade
The Mount Colah Station Upgrade has delivered a new accessible footbridge with three lifts, upgraded station entries, improved paths of travel and platform resurfacing, replacing the former footbridge and removing many stairs. The project added a new family accessible toilet and ambulant toilet, upgraded power and services, and improved wayfinding signage, lighting, security and other station systems. Design and construction were delivered for Sydney Trains between March 2022 and August 2024 as part of broader accessibility improvements on the Main North rail line.
Newcastle-Sydney and Wollongong-Sydney Rail Line Upgrades
Program of upgrades to existing intercity rail corridors linking Newcastle-Central Coast-Sydney and Wollongong-Sydney to reduce travel times and improve reliability. Current scope includes timetable and service changes under the Rail Service Improvement Program, targeted network upgrades (signalling, power, station works) and the introduction of the Mariyung intercity fleet on the Central Coast & Newcastle Line, alongside Federal planning led by the High Speed Rail Authority for a dedicated Sydney-Newcastle high speed corridor.
Employment
AreaSearch analysis reveals Mount Colah recording weaker employment conditions than most comparable areas nationwide
Mount Colah has a highly educated workforce. The technology sector is particularly well-represented. As of December 2025, the unemployment rate stands at 6.9%, according to AreaSearch's aggregation of statistical area data.
In that same month, 4,429 residents are employed, with an unemployment rate of 2.7% higher than Greater Sydney's rate of 4.2%. Workforce participation is broadly similar to Greater Sydney's 68.8%. Census responses indicate a high proportion of residents working from home, at 47.3%, though Covid-19 lockdown impacts should be considered. Dominant employment sectors include health care & social assistance, education & training, and professional & technical services.
Mount Colah specializes in education & training, with an employment share 1.4 times the regional level. Conversely, transport, postal & warehousing is under-represented, at 3.4% compared to Greater Sydney's 5.3%. Limited local employment opportunities are suggested by the ratio of Census working population to resident population. Between December 2024 and December 2025, Mount Colah's labour force increased by 0.6%, while employment declined by 1.0%, leading to a rise in unemployment rate of 1.6 percentage points. In contrast, Greater Sydney saw employment grow by 2.2% and the labour force expand by 2.3%. Jobs and Skills Australia's national employment forecasts from May-25 project national employment growth of 6.6% over five years and 13.7% over ten years. Applying these projections to Mount Colah's employment mix suggests local employment should increase by 7.1% over five years and 14.5% over ten years, though these are simple extrapolations for illustrative purposes only and do not account for localized population projections.
Frequently Asked Questions - Employment
Income
Income metrics indicate excellent economic conditions, with the area achieving higher performance than 75% of national locations assessed by AreaSearch
Mount Colah suburb shows median taxpayer income of $60,214 and average income of $76,842 according to latest postcode level ATO data aggregated by AreaSearch for financial year 2023. This is above national average, contrasting with Greater Sydney's median income of $60,817 and average income of $83,030. Based on Wage Price Index growth of 10.32% since financial year 2023, current estimates would be approximately $66,428 (median) and $84,772 (average) as of March 2026. Census 2021 income data shows household, family and personal incomes rank highly in Mount Colah, between 81st and 90th percentiles nationally. Income distribution shows 31.6% of population falls within $1,500 - $2,999 range, mirroring broader area where 30.9% occupy this bracket. Higher earners represent substantial presence with 41.0% exceeding $3,000 weekly income. Housing accounts for 15.1% of income while strong earnings rank residents within 90th percentile for disposable income. Area's SEIFA income ranking places it in the 9th decile.
Frequently Asked Questions - Income
Housing
Mount Colah is characterized by a predominantly suburban housing profile, with above-average rates of outright home ownership
Mount Colah's dwelling structure, as per the latest Census, consisted of 83.8% houses and 16.2% other dwellings (semi-detached, apartments, 'other' dwellings). This compares to Sydney metro's 55.9% houses and 44.1% other dwellings. Home ownership in Mount Colah stood at 33.6%, with mortgaged dwellings at 48.7% and rented ones at 17.6%. The median monthly mortgage repayment was $2,544, higher than Sydney metro's average of $2,427. Median weekly rent in Mount Colah was $525, compared to Sydney metro's $470. Nationally, Mount Colah's mortgage repayments were significantly higher at $1,863, and rents substantially above the national figure of $375.
Frequently Asked Questions - Housing
Household Composition
Mount Colah features high concentrations of family households, with a higher-than-average median household size
Family households constitute 83.2% of all households, including 47.4% couples with children, 25.0% couples without children, and 9.7% single parent families. Non-family households account for the remaining 16.8%, with lone person households at 15.4% and group households comprising 1.5%. The median household size is 2.9 people, larger than the Greater Sydney average of 2.7.
Frequently Asked Questions - Households
Local Schools & Education
Educational achievement in Mount Colah places it within the top 10% nationally, reflecting strong academic performance and high qualification levels across the community
The area's university qualification rate is 39.9%, significantly lower than the SA4 region average of 57.1%. Bachelor degrees are most common at 26.0%, followed by postgraduate qualifications (10.2%) and graduate diplomas (3.7%). Vocational credentials are prevalent, with 30.6% of residents aged 15+ holding them, including advanced diplomas (12.1%) and certificates (18.5%). Educational participation is high, with 30.2% of residents currently enrolled in formal education, comprising 9.8% in primary, 8.9% in secondary, and 5.5% in tertiary education.
Educational participation is notably high, with 30.2% of residents currently enrolled in formal education. This includes 9.8% in primary education, 8.9% in secondary education, and 5.5% pursuing tertiary education.
Frequently Asked Questions - Education
Schools Detail
Nearby Services & Amenities
Transport
Transport servicing is good compared to other areas nationally based on assessment of service frequency, route connectivity and accessibility
Mount Colah has 82 active public transport stops offering a mix of train and bus services. These are covered by 24 routes, serving 2,170 weekly passenger trips in total. Residents enjoy excellent transport accessibility, with an average distance of 149 meters to the nearest stop. Commuting patterns show that most residents travel outward from Mount Colah, predominantly by car (83%), while 11% use trains. The area has an average vehicle ownership of 1.5 per dwelling, higher than the regional norm. According to the 2021 Census, 47.3% of residents work from home, which may be influenced by COVID-19 conditions.
Service frequency across all routes averages 310 trips per day, equating to approximately 26 weekly trips per stop.
Frequently Asked Questions - Transport
Transport Stops Detail
Health
Mount Colah's residents are extremely healthy with very low prevalence of common health conditions across all age groups
Analysis shows Mount Colah's health metrics indicate strong performance across various indicators. Mortality rates and chronic condition prevalence were found to be very low across all age groups.
Private health cover was high at approximately 57% of the total population (~4,693 people), compared to Greater Sydney's 59.9%. The most prevalent medical conditions were asthma (8.2%) and mental health issues (7.1%). Conversely, 72.2% reported being completely clear of medical ailments, compared to Greater Sydney's 74.6%. Under-65 residents demonstrated better than average health outcomes. Mount Colah has 16.3% residents aged 65 and over (1,335 people). Health outcomes among seniors are particularly strong, aligning with national rankings for the general population.
Frequently Asked Questions - Health
Cultural Diversity
Mount Colah was found to be more culturally diverse than the vast majority of local markets in Australia, upon assessment of a range of language and cultural background related metrics
Mount Colah, surveyed in August-September 2016, had a higher cultural diversity than most local areas. It had 33.3% of its population born overseas and 26.2% speaking languages other than English at home. Christianity was the predominant religion, comprising 48.3%.
Judaism was overrepresented compared to Greater Sydney, with 0.4% versus 0.8%. The top three ancestry groups were English (24.6%, regional average: 19.0%), Australian (23.2%, regional average: 17.8%), and Other (12.1%). Notably, Hungarian (0.5% vs 0.3%), Russian (0.5% vs 0.4%), and Korean (0.8% vs 1.1%) were overrepresented compared to regional averages.
Frequently Asked Questions - Diversity
Age
Mount Colah's population is slightly older than the national pattern
Mount Colah has a median age of 40, which is slightly higher than Greater Sydney's figure of 37 and Australia's figure of 38 years. The 45-54 age cohort is notably over-represented in Mount Colah at 16.6%, compared to the Greater Sydney average, while the 25-34 age group is under-represented at 8.5%. Between 2021 and present, the 15-24 age group has increased from 12.1% to 14.0%, and the 75-84 cohort has risen from 4.3% to 5.7%. Conversely, the 25-34 age group has declined from 10.7% to 8.5%, and the 0-4 age group has dropped from 5.9% to 4.8%. By 2041, demographic modeling suggests significant changes in Mount Colah's age profile. The 55-64 age cohort is projected to expand by 291 people (27%), from 1,089 to 1,381. Notably, the combined 65+ age groups are expected to account for 55% of total population growth, reflecting the area's aging demographic trend. Meanwhile, the 5-14 and 0-4 age cohorts are anticipated to experience population declines.