Thornleigh

Suburb (SAL)

Greater Sydney / Hornsby

 
 
 
 
 
 
 
Data Sources ABSValuer GeneralRental BoardACARA Newest Aug 2026 · Refreshed ABS QuickStats SAL13866 How we calculate this
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Suburb (SAL) Boundary Analysis

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.

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Sales ActivityProperty Sales Trends in Thornleigh

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The median house price in Thornleigh is $1.88m, with units at $820k. House values have moved 1.4% a year compounded over five years.

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DemographicsPopulation Growth in Thornleigh

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Thornleigh has an estimated 9,376 residents, up from 8,898 at the 2021 Census — a change of 478 people, or 5.4%. Growth has averaged 0.9% a year over five years. Overseas migration accounts for 91.0% of that increase. That puts 2,423 residents on each square kilometre. Population is estimated from ABS Estimated Resident Population releases and GNAF address data, re-based from the 2021 Census and updated annually.

Detail

Drawing on census data and subsequent addresses verified by AreaSearch, the suburb of Thornleigh has an estimated population of 9,376 as of May 2026. This represents an expansion of 478 people (5.4%) from the 2021 Census, when the headcount stood at 8,898 people. The estimate is derived from a resident baseline of 9,375 calculated from the June 2025 ABS ERP publication, combined with 82 validated new addresses registered since the census date. This population level translates to a density of 2,422 persons per square kilometer, placing the suburb in the top quarter of Australian territories analyzed by AreaSearch.

The suburb of Thornleigh's 5.4% expansion rate post-census is within 1.7 percentage points of the state average (7.1%), reflecting competitive local demand. This growth was largely underpinned by net overseas migration, which accounted for approximately 91.0% of the total demographic gains during recent times. Demographic outlooks utilize ABS and Geoscience Australia projections published in 2024 using a 2022 baseline. For areas where these figures are unavailable, projections rely on the 2022 NSW State Government SA2 dataset with a 2021 baseline. Age-specific growth trajectories from these sources are extended to span the years 2032 to 2041. Based on this methodology, the suburb of Thornleigh is projected to undergo a small demographic contraction, with a reduction of 9 persons by 2041. Despite this overall shift, growth is expected in specific brackets, particularly the 75 to 84 age cohort, which is forecast to increase by 174 people. Details regarding these demographic brackets are available in the age section.

Frequently Asked Questions - Population

What is the latest population estimate for the suburb of Thornleigh?
Total population for the suburb of Thornleigh was estimated to be approximately 9,376 as at May 26. This is based upon an estimated resident population of 9,375 from the ABS up to June 2025.
How has the population in the suburb of Thornleigh changed since 2021?
The suburb of thornleigh has added approximately 478 people and shown a 5.37% increase from the 8,898 people recorded at the 2021 Census period.
What is the population density in the suburb of Thornleigh?
The population density in the suburb of Thornleigh is estimated at 2,422 persons per square kilometer based on the latest population estimate.
How much has the population grown over the past 10 years in the suburb of Thornleigh?
Over the past 10 years, the population in the suburb of Thornleigh has shown a compound annual growth rate of 0.8% per annum.
What are the main drivers of population growth in the suburb of Thornleigh?
Population growth in the suburb of Thornleigh is driven by: Overseas migration (91.0%), Natural increase (9.0%), Interstate migration (0.0%). The primary driver is Overseas migration, contributing 91.0% of overall population gains.

Residential SupplyHousing Development & Building Approvals in Thornleigh

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140 new dwellings have been approved in Thornleigh over the past five years, an average of 28 a year. That is 3.1 approvals per 1,000 residents. Approvals are currently running at an annualised 14, well below that longer-run average. Figures come from ABS building approvals aggregated to this Suburb (SAL) boundary and are updated monthly as the ABS releases them.

Detail

According to building approval figures compiled by AreaSearch from statistical divisions, Thornleigh has recorded an average of 28 new residential approvals per year. This yields an estimated 140 home approvals over the last 5 financial years (from FY-21 to FY-25) and 13 approvals during the current FY-26 period. The ratio of new residents to completed dwellings averaged 2.8 people per year for each new house built between FY-21 and FY-25, pointing to healthy demand that reinforces residential values. The average value of these newly approved homes stands at $751,000, indicating that building activity is concentrated on upscale, premium properties.

Furthermore, commercial building approvals have reached $10.3 million during the current financial year, demonstrating active business investment. Recent construction approvals consist of 89.0% detached houses and 11.0% multi-unit projects or townhouses, reinforcing the low-density residential character of the suburb and catering to families seeking larger properties. A ratio of approximately 1099 people for each new residential approval indicates a highly established local property market. Faced with stable or declining long-term demographic forecasts, Thornleigh might see eased pressure on its housing stock, potentially creating advantageous buying conditions.

Frequently Asked Questions - Development

How many dwelling approvals have occurred in the suburb of Thornleigh recently?
Dwelling approval activity in the the suburb of Thornleigh area has seen 17 residential approvals over the past two financial years, based on AreaSearch's SA2 aggregation method. The suburb of Thornleigh's current population of 9,376 has been supported by 28 approvals on average over recent years.
How does the suburb of Thornleigh's development activity compare to the broader region?
The suburb of Thornleigh has seen 0.31 approvals per 100 people in recent years, compared to 0.65 approvals in the broader region. This means that one dwelling has been approved for every 1098 people in the suburb of Thornleigh, compared to one for every 190 in the broader region.
Is the suburb of Thornleigh keeping up with housing demand?
Population forecasts suggest stable or declining population, reducing pressure on housing supply in the the suburb of Thornleigh area.
What has been the trend in development approvals over the past five years in the suburb of Thornleigh?
Looking at development activity over the past five years, the suburb of Thornleigh's approval levels have been significantly below the yearly average of 28, showing a notable downturn in recent development.
How does recent development compare to population growth in the suburb of Thornleigh?
Over the past five years, the population in the suburb of Thornleigh has grown by approximately 1,458 people, while 140 residential approvals were recorded. This equates to a ratio of 10.4 people added for each new dwelling approval. This high ratio suggests strong population growth relative to housing supply, potentially indicating unmet housing demand.
Are there opportunities for residential developers in the suburb of Thornleigh?
With dwelling approval activity running at an average of 28 approvals per year and a population of 9,376, stable population forecasts suggest a mature market with selective development opportunities.
Approvals Pipeline Development applications near Thornleigh

Development applications around Thornleigh

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SOURCE: Planning portals and council registers, compiled by AreaSearch. Distance & bearing measured from the suburb midpoint.

Project PipelineInfrastructure & Major Projects in Thornleigh

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AreaSearch tracks 5 current infrastructure and development projects inside Thornleigh, worth an estimated $521 million. A further 57 sit in the immediately surrounding suburbs, taking the tracked pipeline within reach of the area to $16.3 billion. 6 are already under construction and 13 are due for completion within three years. The pipeline spans residential development, transport & logistics and communities, precincts & urban renewal. Records are compiled from Infrastructure Australia, state agencies, council planning portals and public announcements, reviewed and updated daily, then ranked by proximity, construction stage, completion horizon and project scale.

Detail

Local infrastructure projects, planning changes, and public investments are major drivers of regional performance. AreaSearch has identified 10 developments expected to influence the local area. Key projects include Thornleigh Quarter, Thornleigh Marketplace Redevelopment, 15-19 Station Street Mixed-Use Development Thornleigh, and The Sanctuary Thornleigh, with the primary initiatives detailed in the list below.

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Frequently Asked Questions - Infrastructure

What are some of the major infrastructure and planning changes likely to influence the suburb of Thornleigh?
Key infrastructure and planning changes likely to influence the suburb of Thornleigh include: Thornleigh Quarter (Construction); Thornleigh Marketplace Redevelopment (Dev. Approval); 15-19 Station Street Mixed-Use Development Thornleigh (Approved); The Sanctuary Thornleigh (Completed); and Westleigh Park (Approved). These projects represent significant developments that will shape the area's future infrastructure landscape.
What types of infrastructure projects are impacting the suburb of Thornleigh?
Infrastructure development impacting the suburb of Thornleigh spans multiple sectors including Residential Development, Retail, and Transport & Logistics, among others.
What is the scale of infrastructure investment impacting the suburb of Thornleigh?
Infrastructure investment analysis indicates substantial capital deployment exceeding $3.4 billion in projects that will impact the extended area, with a notable concentration of investment within the immediate the suburb of Thornleigh vicinity.
How does the suburb of Thornleigh's infrastructure development compare to other areas?
With an infrastructure score in the top 30%, the suburb of Thornleigh demonstrates above-average development activity compared to national benchmarks.
Thornleigh Marketplace Redevelopment
Category: Retail
Stage: Approved | Est. Comp: 2027
Source / Links: Link 1   Link 2  

Holdmark is progressing an approved redevelopment of the Thornleigh Marketplace neighbourhood shopping centre. The project involves significant additions including a new second-floor level above the rooftop car park, creating additional retail space, a food court, and rooftop terraces. Recent modifications approved in 2024 refined the layout to include a Woolworths direct-to-boot facility within the existing car park structure. The center remains anchored by Woolworths and Dan Murphys.

Retail

15-19 Station Street Mixed-Use Development Thornleigh
Category: Residential Development
Stage: Approved | Est. Comp: 2026
Source / Links: Link 1   Link 2  

Approved six storey mixed use development at 15-19 Station Street, Thornleigh, comprising 48 residential apartments above ground floor commercial space with basement parking. The project is located immediately adjacent to Thornleigh Railway Station and was approved by Hornsby Shire Council under DA 2022/0432 to deliver higher density housing and local retail next to public transport.

Residential Development

Thornleigh Quarter
Category: Residential Development
Stage: Construction | Est. Comp: 2027
Source / Links: Link 1   Link 2  

Thornleigh Quarter is a mixed use precinct by Holdmark planned to deliver about 326 apartments across three mid rise buildings with ground floor retail and cafe spaces, activated frontages to Pennant Hills Road and landscaped communal terraces and courtyards directly opposite Thornleigh Station.

Residential Development

Hornsby Park
Category: Communities
Stage: Construction | Est. Comp: 2028
Source / Links: Link 1   Link 2  

Transformation of the 60-hectare former Hornsby Quarry site into a major regional bush parkland in Sydney's upper north shore. The first stage opened to the public in late March 2026, comprising the Crusher Plant Precinct (lawns, picnic shelters, electric BBQs, accessible toilets, free parking), the Southern Lookout providing fully accessible sweeping views into the volcanic quarry void, and the upgraded Heritage Steps linking the Hornsby Aquatic and Leisure Centre down into the precinct. Construction continues in stages, with future works including the Quarry Loop walking and cycling track, additional scenic lookouts, a bike jump and pump track, and the Old Mans Valley field of play.Longer term masterplan elements feature a freshwater quarry lake, wetlands cascade, lakeside amenities and an accessible lift to the quarry base. The masterplan was designed by Clouston Associates with Hornsby Shire Council. Stage 1 has been supported by the NSW Government through the Stronger Communities Fund.

Communities

The Residences at Wahroonga Estate
Category: Communities
Stage: Construction | Est. Comp: 2027
Source / Links: Link 1   Link 2  

Stage 1 of the $1.5 billion Wahroonga Estate masterplan, delivering 128 premium apartments across three six-storey buildings on the 66-hectare Seventh-day Adventist Church precinct. Developed by Capital Corporation in a joint venture with the Church and built by DASCO, the project features curved brick facade design by Group GSA, bespoke interiors by Coco Republic, and landscaped communal spaces with direct access to Coups Creek bushland. Targeting downsizers and owner-occupiers on Sydney's Upper North Shore, adjacent to the Sydney Adventist Hospital.

Communities

The Sanctuary Thornleigh
Category: Residential Development
Stage: Completed | Est. Comp: 2024
Source / Links: Link 1   

Premium master-planned residential community delivered by Toplace Group, comprising around 184 apartments and townhouses with resort-style resident facilities in a bushland setting at Thornleigh on Sydneys Upper North Shore. Construction is understood to be complete, with the estate now operating as a private residential community.

Residential Development

Keynote Residences Beecroft
Category: Residential Development
Stage: Construction | Est. Comp: 2026
Source / Links: Link 1   Link 2  

Mixed-use 5-storey residential and retail development featuring 34 luxury apartments with 2 ground floor retail spaces. Located in the heart of Beecroft with easy access to transport, schools, and amenities.

Residential Development

Thornleigh Station Upgrade
Category: Transport & Logistics
Stage: Completed | Est. Comp: 0
Source / Links: Link 1   

Transport Access Program upgrade providing three new lifts for platform access, weather protection shelters, improved lighting and accessibility compliance for mobility-impaired passengers.

Transport & Logistics

Jobs & IndustryEmployment Trends in Thornleigh

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5,031 residents of Thornleigh are employed, from a labour force of 5,246. Unemployment sits at 4.1%, with participation at 69.1%. Weighted for its industry mix, the area's sectors are forecast to grow about 7.3% nationally over five years. That reflects industry composition only and makes no allowance for local population growth. The working-day population is estimated at 8,277, about 88% of the resident population, so more people leave the area for work than travel in. Unemployment and labour force come from ABS Small Area Labour Markets, updated quarterly; the industry and occupation profile is from the 2021 Census.

Detail

The local labor pool is characterized by high levels of qualification, with a particularly strong concentration in technology industries, an unemployment rate of 4.1%, and an estimated annual job growth rate of 3.8% based on localized data summaries. As of March 2026, the employed population numbered 5,031 residents. The unemployment rate matches the Greater Sydney benchmark of 4.1%, while the participation rate aligns with the metropolitan average of 69.1%. Census responses indicate that 55.3% of the working population performed their duties from home, though this figure likely reflects the influence of pandemic-related restrictions.

The primary sectors employing local residents are health care & social assistance, professional & technical services, and education & training. The area exhibits a notable concentration in education & training, which accounts for an employment share 1.5 times the metropolitan average. Conversely, the transport, postal & warehousing sector is underrepresented, making up only 2.6% of the workforce compared to 5.3% across the wider region. Given the difference between the local working population and resident employment numbers, this residential community appears to provide limited internal job opportunities. Aggregated data from the ABS and SALM indicates that employment grew by 3.8% over the 12-month period, while the overall labor force expanded by 1.7%, leading to a 1.9 percentage points drop in the unemployment rate. This outpaced the broader Greater Sydney region, which experienced a 1.9% rise in employment, a 1.9% expansion in the labor force, and a marginal decline in unemployment. National forecasts released in May-25 by Jobs and Skills Australia provide further context on expected demand changes in Thornleigh. These projections, spanning five and ten-year horizons, have been applied to the local workforce structure to map out future patterns. While national employment is projected to grow by 6.6% over five years and 13.7% over ten years, growth rates vary widely by industry. Weighting these projections against the local industry mix suggests employment within Thornleigh is on track to rise by 7.3% over five years and 14.7% over ten years, representing a basic mathematical extrapolation that excludes localized demographic projections.

Frequently Asked Questions - Employment

What is the employment situation in the suburb of Thornleigh?
As of March 2026, the suburb of Thornleigh has approximately 5,031 employed residents with an unemployment rate of 4.1%. This healthy unemployment rate suggests a well-functioning labour market. Employment performance is above the national median, showing positive labour market dynamics.
How does the suburb of Thornleigh's unemployment rate compare to the broader region?
As of March 2026, the unemployment rate in the suburb of Thornleigh stands at 4.1%, which is broadly in line with Greater Sydney's rate of 4.1%. For comparison, the national unemployment rate is 4.2%.
What are the major employment sectors in the suburb of Thornleigh?
The employment landscape in the suburb of Thornleigh is dominated by several key sectors. The largest employers are health care & social assistance (15.6% of employment), professional & technical (14.3%), and education & training (13.7%). Other significant employers include retail trade and finance & insurance.
How has employment changed recently in the suburb of Thornleigh?
Over the past year to March 2026, the suburb of Thornleigh has experienced employment growth, with total employment increasing while the labour force increased. As a result, the unemployment rate has fall. By comparison, Greater Sydney saw employment increased and its unemployment rate dropped.
What is the workforce participation rate in the suburb of Thornleigh?
The workforce participation rate in the suburb of Thornleigh is 69.1%, which represents the proportion of working-age residents who are either employed or actively seeking work. This healthy participation rate reflects good employment opportunities and workforce engagement. The local rate matching the Greater Sydney average of 69.1%, showing similar workforce dynamics to the broader region.
Which industries are over-represented in the suburb of Thornleigh's employment market?
The suburb of thornleigh shows notable specialization in education & training, which employs 13.7% of the local workforce compared to 8.9% regionally. This concentration suggests the area has developed competitive advantages in this sector. The area also shows above-average employment in 1 other sectors, contributing to a distinctive economic profile.
What are the employment growth prospects for the suburb of Thornleigh?
Based on Jobs and Skills Australia projections applied to the suburb of Thornleigh's industry mix, employment is expected to grow by 7.3% over the next five years and 14.7% over ten years. This exceeds the national forecast of 6.6% over five years, suggesting the area's industry composition is well-positioned for future growth. Steady growth is anticipated across multiple sectors, providing diverse employment opportunities.
How does the job market in the suburb of Thornleigh compare nationally?
The suburb of thornleigh's employment market shows above-average performance nationally, placing in the top half of areas assessed. Employment indicators suggest healthy labour market conditions relative to other regions. Recent job advertisement trends show the broader employment region saw a 5.9% decline, ranking 29.0th out of 37 regions nationally.
What employment opportunities exist for skilled workers in the suburb of Thornleigh?
Skilled workers will find excellent opportunities in the suburb of Thornleigh, with knowledge-intensive sectors comprising 54.4% of local employment. Key sectors for skilled workers include health care & social assistance (15.6%), professional & technical (14.3%), and education & training (13.7%). With projected employment growth of 7.3% over five years, demand for skilled workers is expected to remain strong.

EarningsHousehold Income in Thornleigh

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Median household income in Thornleigh is $2,681 a week (about $139,000 a year), with median personal income at $1,025 a week. ATO records put median taxable income at $63,859 a year against an average of $96,146. The average runs 51% above the median, a wider spread than most areas and a sign of a concentrated group of high earners. Household income is from the 2021 Census; taxable income is from ATO Taxation Statistics for the latest financial year available, indexed forward using the ABS Wage Price Index.

Detail

ATO records for the 2023 financial year show that the suburb of Thornleigh recorded a median taxpayer income of $63,859, with the average income reaching $96,146. This places the area in the top national percentile, comparing favorably to Greater Sydney averages of $60,817 and $83,003. Factoring in Wage Price Index growth of 10.32% since the 2023 financial year, current estimated values would stand at roughly $70,449 for the median and $106,068 for the average as of March 2026. According to census data, incomes for households, families, and individuals in Thornleigh are highly ranked, falling in the 81st to 93rd percentiles across the country.

The largest bracket consists of 29.5% of local residents (2,765 people) earning over $4000+, differing from the broader metropolitan area where the $1,500 - 2,999 bracket is largest at 30.9%. This concentration of high-income earners, with 45.1% of households earning above $3,000/week, indicates substantial purchasing power. Even though housing costs consume 15.4% of earnings, strong overall income levels place disposable income in the 93rd percentile, with a SEIFA income decile rank of 9th.

Frequently Asked Questions - Income

What is the median taxable income in the suburb of Thornleigh?
Based on Wage Price Index adjustments to March 2026, the estimated median taxable income in the suburb of Thornleigh is approximately $70,449. The official ATO data from FY-23 recorded a median of $63,859.
What is the average taxable income in the suburb of Thornleigh?
Based on Wage Price Index adjustments to March 2026, the estimated average taxable income in the suburb of Thornleigh is approximately $106,068. The official ATO data from FY-23 recorded an average of $96,146.
How does the median taxable income in the suburb of Thornleigh compare to the region?
Based on Wage Price Index adjustments to March 2026, the estimated median taxable income in the suburb of Thornleigh is approximately $70,449 compared to $67,093 in Greater Sydney. The official ATO data from FY-23 shows $63,859 and $60,817 respectively.
How does the average taxable income in the suburb of Thornleigh compare to the region?
Based on Wage Price Index adjustments to March 2026, the estimated average taxable income in the suburb of Thornleigh is approximately $106,068 compared to $91,569 in Greater Sydney. The official ATO data from FY-23 shows $96,146 and $83,003 respectively.
What are the main income cohorts in the suburb of Thornleigh according to the 2021 Census?
As per the 2021 Census, the income bracket containing the largest proportion (~29.5% / 2,765 persons) of the suburb of Thornleigh's population is the $4000+ cohort.
How do the main income cohorts in the suburb of Thornleigh compare to the region?
The largest income cohort in the suburb of Thornleigh is the $4000+ group, representing about 29.5% of the population. In comparison, Greater Sydney's largest income cohort is the $1,500 - 2,999 group, representing 30.9% of its population, according to the 2021 Census.
What is the median household income in the suburb of Thornleigh according to the 2021 Census?
The 2021 Census data indicates that the median household income in the suburb of Thornleigh is $2,681/wk.
What is the median family income in the suburb of Thornleigh according to the 2021 Census?
According to the 2021 Census, the median family income in the suburb of Thornleigh is $3,016/wk.
What is the median personal income in the suburb of Thornleigh according to the 2021 Census?
The 2021 Census shows that the median personal income in the suburb of Thornleigh is $1,025/wk.
How does the suburb of Thornleigh's income rank nationally?
According to AreaSearch's aggregation of the latest postcode level ATO data released for FY-23, the suburb of Thornleigh had a median income among taxpayers of $63,859 with the average level standing at $96,146. This is exceptionally high 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 FY-23, current estimates would be approximately $70,449 (median) and $106,068 (average) as of March 2026.
What is the disposable income in the suburb of Thornleigh?
The estimated disposable income in the suburb of Thornleigh is $9,833 per year according to AreaSearch analysis.
How does the suburb of Thornleigh's disposable income compare to the region?
The suburb of thornleigh's disposable income is $9,833 compared to $7,412 for Greater Sydney, based on AreaSearch analysis.

Housing StockHousing & Dwellings in Thornleigh

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Thornleigh had 2,970 occupied dwellings at the 2021 Census, 77% detached houses and 8% apartments. 44% are owned with a mortgage, 24% rented and 32% owned outright. At that Census the median rent was $530 a week and the median mortgage repayment $2,800 a month, a total housing cost higher than 93% of areas nationally. Rent absorbs 19.8% of household income here and mortgage repayments 24.1%. Dwelling stock, tenure and housing costs are 2021 Census measures — the only source that counts dwellings at this boundary size.

Detail

The local housing stock at the time of the census consisted of 76.5% freestanding houses and 23.5% alternative dwelling types, such as apartments and semi-detached homes, compared to 55.9% houses and 44.1% other dwellings across metropolitan Sydney. Home ownership rates in the area were notably higher than metropolitan averages, sitting at 32.1%, with the remaining properties being purchased via mortgages (44.3%) or rented (23.7%). The median mortgage payment of $2,800 monthly was higher than the metropolitan Sydney median of $2,427, while median weekly rent was recorded at $530, compared to the metropolitan Sydney median of $470.

On a national scale, mortgage costs are significantly higher than the Australian average of $1,863, and weekly rents exceed the country-wide figure of $375.

Frequently Asked Questions - Housing

What percentage of homes are owned vs rented in the suburb of Thornleigh?
In the suburb of Thornleigh, 32.1% of homes are owned outright, 44.3% are owned with a mortgage, and 23.7% are rented.
What percentage of dwellings in the suburb of Thornleigh are houses?
According to the latest data, 76.5% of dwellings in the suburb of Thornleigh are houses.
What percentage of dwellings in the suburb of Thornleigh are apartments or units?
In the suburb of Thornleigh, 8.0% of dwellings are apartments or units, with an additional 15.5% being semi-detached dwellings.
What is the level of outright home ownership in the suburb of Thornleigh?
Outright home ownership in the suburb of Thornleigh stands at 32.1%, compared to 28.7% in Greater Sydney.
What is the median monthly mortgage repayment in the suburb of Thornleigh?
The median monthly mortgage repayment in the suburb of Thornleigh is $2,800, compared to $2,427 in Greater Sydney.
What is the median weekly rent in the suburb of Thornleigh?
The median weekly rent in the suburb of Thornleigh is $530, compared to $470 in Greater Sydney.
What is the distribution of rental prices in the suburb of Thornleigh?
In the suburb of Thornleigh, 5.0% of rentals are $0-149/week, 14.1% are $150-349/week, 52.7% are $350-649/week, 24.6% are $650-949/week, and 3.5% are $950+/week.
What is the average monthly housing cost in the suburb of Thornleigh?
The aggregate monthly housing cost in the suburb of Thornleigh is $1,784, which represents the average monthly cost across all housing types.
What percentage of income do residents spend on housing in the suburb of Thornleigh?
In the suburb of Thornleigh, households with mortgages typically spend 24.1% of their income on mortgage repayments, while renters spend 19.8% of their income on rent.
How crowded are homes in the suburb of Thornleigh?
The average persons per bedroom ratio in the suburb of Thornleigh is 0.9, indicating the level of household density.
How does housing affordability in the suburb of Thornleigh compare to the region?
Housing affordability in the suburb of Thornleigh shows mortgage holders spending 24.1% of income on repayments (vs 27.0% regionally), while renters spend 19.8% of income on rent (vs 22.6% regionally).
What types of dwellings are most common in the suburb of Thornleigh?
The dwelling mix in the suburb of Thornleigh consists of 76.5% detached houses, 15.5% semi-detached dwellings, 8.0% apartments, and 0.0% other dwelling types.
What is the weighted average housing cost based on tenure mix in the suburb of Thornleigh?
Based on the area's tenure composition, the weighted average monthly housing cost is approximately $1,784. This accounts for outright owners paying no housing costs, mortgage holders paying $2,800/month, and renters paying $2,295/month.
How affordable is housing in the suburb of Thornleigh relative to local incomes?
Housing in Thornleigh consumes approximately 15.4% of median household income ($11,609 monthly), indicating costs are highly affordable. The generally accepted benchmark is that housing should not exceed 30% of household income.
How do proposed developments compare to existing housing types in the suburb of Thornleigh?
Recent development applications in Thornleigh show attached dwellings contributing 0% of approvals compared to 24% of existing stock, while detached houses represent 100% of applications versus 76% of current dwellings. This suggests development patterns consistent with existing housing mix. Density increases remain below national trends.

HouseholdsHousehold Composition in Thornleigh

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Thornleigh counted 2,970 households at the 2021 Census, an estimated 3,130 today, averaging 2.9 people each. 47% are couples with children, more than in 91% of areas nationally, against 22% couples without children. 16% of households are people living alone, and families average 1.5 children. Household and family composition is measured only by the Census, so these are 2021 figures.

Detail

Family units constitute the majority of households at 81.8%, divided into couples with children at 46.8%, couples without children at 22.4%, and single parent households at 11.4%. The remaining 18.2% consists of non-family households, with single person households accounting for 16.2% and shared group houses making up 2.1%. The median household occupancy stands at 2.9 people, which is higher than the Greater Sydney average of 2.7.

Frequently Asked Questions - Households

How many households are in the suburb of Thornleigh?
As of the 2021 Census, the suburb of Thornleigh had 2,970 households. Based on population growth patterns, this has grown by approximately 5.4% to an estimated 3,130 households today.
What is the typical household size?
The median household size in the suburb of Thornleigh is 2.9 people. This compares to 2.7 in Greater Sydney and reflects the area's household composition mix.
What types of households are most common?
Family households dominate at 81.8% of all households. The remaining households consist of lone person households (16.2%), group households (2.1%), and other household types (0.1%).
How are families structured in the area?
Among the 2,429 family households, 46.8% are couples with children, 22.4% are couples without children at home, and 11.4% are single parent families. This mix shapes local demand for schools, family services, and housing types.
How does the suburb of Thornleigh compare to regional household patterns?
Compared to Greater Sydney, the suburb of Thornleigh shows distinct household patterns. Family households are notably over-represented at 81.8% (versus 72.6% regionally). Conversely, lone person households are under-represented at 16.2% compared to the regional 23.2%. This family-oriented profile influences local demand for family homes, schools, and children's services.
What is the average family size?
Families in the suburb of Thornleigh have an average of 1.5 children, matching the Greater Sydney average of 1.5. This influences local demand for child-related services and larger family homes.
What are the marriage patterns in the suburb of Thornleigh?
Marriage patterns reveal 57.2% of the adult population are currently married, while 29.2% have never married. This compares to 48.3% married and 36.4% never married across Greater Sydney.
How significant are single-person households?
Single-person households represent 16.2% of all households in the suburb of Thornleigh, notably lower than the regional average of 23.2%. This affects demand for smaller dwellings and single-person accommodation.
Are shared living arrangements common?
Group households (unrelated people sharing) account for 2.1% of households, well below the Greater Sydney average of 4.2%. This low rate suggests limited student or young professional shared accommodation.
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EducationSchools & Education in Thornleigh

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48.7% of adults in Thornleigh hold a university qualification, including 30.0% with a bachelor degree and 15.1% with postgraduate qualifications, higher than 98% of areas nationally. A further 12.7% hold a vocational qualification. 2 schools serve the area, with 864 enrolment places and an average ICSEA of 1,137 against a national benchmark of 1,000. Qualifications come from the 2021 Census; school enrolments, ICSEA and results come from ACARA's current release.

Detail

The level of education in Thornleigh is significantly higher than broader geographical averages, with 48.7% of residents aged 15+ holding a university degree, compared to 30.4% nationally and 32.2% across NSW. This high concentration of tertiary qualifications positions the area well for professional opportunities. Bachelor degrees are the most common qualification at 30.0%, followed by postgraduate degrees at 15.1% and graduate diplomas at 3.6%. Technical and vocational pathways represent 23.7% of qualifications among residents aged 15+, consisting of advanced diplomas (11.0%) and vocational certificates (12.7%). Participation in study is high, with 32.4% of the population enrolled in an educational institution.

This includes 11.3% attending primary school, 9.1% in secondary education, and 6.3% enrolled in tertiary courses.

Frequently Asked Questions - Education

What percentage of people in the suburb of Thornleigh have university qualifications?
48.7% of people aged 15 and over in the suburb of Thornleigh have university qualifications, compared to 38.0% in the broader region.
What percentage of people in the suburb of Thornleigh have no formal qualifications?
27.6% of people aged 15 and over in the suburb of Thornleigh have no formal qualifications, compared to 34.2% regionally.
How does the suburb of Thornleigh's education level compare to national averages?
The suburb of thornleigh ranks in the 98th percentile nationally for education based on AreaSearch's analysis of qualification and performance metrics.
What types of qualifications are most common in the suburb of Thornleigh?
The most common qualifications in the suburb of Thornleigh are: Bachelor Degree (30.0%), Postgraduate (15.1%), Certificate (12.7%).
What proportion of the suburb of Thornleigh's population is currently attending educational institutions?
32.4% of the population in the suburb of Thornleigh is currently engaged in formal education, with 11.3% in primary school, 9.1% in secondary school, 6.3% at university.
What is the ICSEA score for schools in the suburb of Thornleigh?
The average ICSEA (Index of Community Socio-Educational Advantage) score for schools in the suburb of Thornleigh is 1137, indicating above-average socio-educational advantage compared to the national average of 1000.
How many schools are located within the suburb of Thornleigh?
There are 2 schools within the suburb of Thornleigh, with a combined enrollment of approximately 864 students.
What types of schools are available in the suburb of Thornleigh?
The suburb of thornleigh includes 2 primary schools.

Schools Detail

AmenitiesServices & Amenities in Thornleigh

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Getting AroundTransport & Commuting in Thornleigh

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Public transport in Thornleigh reaches 99 stops on 47 routes, timetabled for about 3,800 services a week. The typical home sits about 130 m from its nearest stop. Buses carry the largest share of public transport commuters. Households keep an average of 1.4 vehicles. Stop and service counts are built from operators' published GTFS timetables and refresh with each timetable release; vehicle ownership is from the 2021 Census.

Detail

The local public transport network consists of 99 active stops, including both train stations and bus stops. These stops are served by 47 different routes, which together provide 3,827 weekly passenger trips. Transport access is highly rated, with the average distance to the nearest stop standing at 133 meters. Given the residential nature of the suburb, most workers commute out of the area, with private cars remaining the primary travel mode at 78%, followed by trains at 13%. Car ownership averages 1.4 vehicles per household, which is above the metropolitan average.

Census data from 2021 indicates that 55.3% of residents worked from home, a figure that may reflect pandemic-era conditions. Services run at an average frequency of 546 trips per day across all active routes, which averages out to approximately 38 weekly trips per public transport stop.

Frequently Asked Questions - Transport

How many public transport stops are in Thornleigh?
There are 99 public transport stops within the suburb of Thornleigh.
How frequent are the transport services in Thornleigh?
the suburb of Thornleigh has 3,827 weekly trips across 47 routes, averaging 546 trips per day.
How far are residents from public transport in Thornleigh?
On average, residential properties are 133 meters from the nearest transport stop.

Transport Stops Detail

HealthcareHealth Services in Thornleigh

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72.9% of residents in Thornleigh report no long-term health condition, a healthier profile than 78% of areas nationally. 4.5% need daily assistance with core activities, and 64.8% hold private health cover. The standardised death rate runs at 4.5 per 1,000 residents. Health conditions, assistance needs and insurance are 2021 Census measures; the death rate comes from current ABS releases.

Detail

Based on health indicators compiled by AreaSearch, including mortality data and chronic illness rates, Thornleigh demonstrates strong overall health outcomes, with low rates of common medical conditions across all age groups. Private health insurance coverage is exceptionally high, held by approximately 65% of the total population (6,078 people). This compares to 59.9% in Greater Sydney and a national benchmark of 55.7%. Asthma and mental health issues were the most frequently reported conditions, affecting 7.3% and 7.2% of residents respectively, while 72.9% of the population reported no chronic conditions, compared to 74.6% across Greater Sydney.

Health outcomes for residents under the age of 65 are better than average. Residents aged 65 and over make up 15.1% of the local population (1,415 people), and health metrics for this senior cohort are particularly strong, ranking higher relative to national benchmarks than the general population.

Frequently Asked Questions - Health

How many people in the suburb of Thornleigh have private health insurance?
Around 64.8% of people in the suburb of Thornleigh are covered by private health insurance, which compares to 59.9% in the broader region of Greater Sydney.
What percentage of the population requires ongoing medical assistance in the suburb of Thornleigh?
In the suburb of Thornleigh, 4.5% of the population is identified as requiring ongoing medical assistance. This figure is slightly different from the regional average, where 5.2% of people in Greater Sydney require similar assistance.
How prevalent is asthma in the suburb of Thornleigh?
7.3% of people in the suburb of Thornleigh are diagnosed with asthma. In comparison, 6.4% of the population across Greater Sydney is affected by asthma.
What percentage of people have diabetes in the suburb of Thornleigh?
Diabetes affects 4.0% of the the suburb of Thornleigh population, while in the surrounding region, 4.3% of people are diagnosed with diabetes.
What is the percentage of people with heart disease in the suburb of Thornleigh?
3.0% of people in the suburb of Thornleigh have heart disease. Across the region of Greater Sydney, 3.2% of the population is affected by heart disease.
How does the suburb of Thornleigh compare to the region in terms of overall private health coverage?
In the suburb of Thornleigh, 64.8% of the population are estimated to have private health insurance. Comparatively, Greater Sydney sees an estimated private health coverage rate of 59.9%.

Ancestry & LanguageCultural Diversity in Thornleigh

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37.1% of Thornleigh residents were born overseas and 32.6% speak a language other than English at home, more culturally diverse than 79% of areas nationally. The largest reported ancestries are English (21.7%) and Australian (20.6%). Ancestry, language and country of birth are counted only by the Census, so these are 2021 figures.

Detail

The area displays high levels of cultural diversity, with 37.1% of the population born outside Australia and 32.6% speaking a language other than English in the home. Christianity is the primary religious affiliation, representing 51.0% of the population. Hinduism represents the most notable variation from regional norms, accounting for 4.5% of residents compared to 5.2% across Greater Sydney. Regarding parent birthplaces, the three most common ancestral backgrounds are English (21.7%), Australian (20.6%), and Other (11.1%). Distinct variations in ethnic representation are evident, with Korean ancestry overrepresented at 2.3% of the local population (compared to 1.1% regionally), Lebanese at 2.6% (compared to 2.6% regionally), and Russian at 0.5% (compared to 0.4% regionally).

Frequently Asked Questions - Diversity

What is the level of cultural diversity in the suburb of Thornleigh?
Thornleigh scores quite highly on cultural diversity, with 37.1% of its population born overseas and 32.6% speaking a language other than English at home.
What is the most common religion in the suburb of Thornleigh?
The main religion in Thornleigh was found to be Christianity, which makes up 51.0% of people in Thornleigh. However, the most apparent overrepresentation was in Hinduism, which comprises 4.5% of the population, compared to 5.2% across Greater Sydney.
What are the top countries of origin in the suburb of Thornleigh?
In terms of ancestry (country of birth of parents), the top three represented groups in Thornleigh are English, comprising 21.7% of the population, Australian, comprising 20.6% of the population, and Other, comprising 11.1% of the population. Additionally, there are notable divergences in the representation of certain other ethnic groups: Korean is notably overrepresented at 2.3% of Thornleigh (vs 1.1% regionally), Lebanese at 2.6% (vs 2.6%) and Russian at 0.5% (vs 0.4%).
How does the percentage of people born overseas compare to the regional average?
37.1% of the the suburb of Thornleigh population was born overseas, compared to 40.5% regionally.
What percentage of the the suburb of Thornleigh population speaks a language other than English at home?
32.6% of the population in the suburb of Thornleigh speaks a language other than English at home, compared to 39.5% in the wider region.
How many people in the suburb of Thornleigh identify as Australian Aboriginal?
0.5% of the the suburb of Thornleigh population identifies as Australian Aboriginal, compared to 1.3% in the region.
What is the citizenship status of the population in the suburb of Thornleigh?
87.0% of the the suburb of Thornleigh population holds citizenship, compared to 80.8% in the wider region.

Age StructureAge Profile of Thornleigh

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The median resident of Thornleigh is 40. 23.8% of residents are aged 15 to 34. Age cohorts are not raw Census counts: the Census split is re-based to the latest ABS population estimates and state projections.

Detail

The local median age of 40 is slightly higher than the Greater Sydney median of 37 and the national median of 38. The 45 - 54 demographic is notably overrepresented at 15.4% of the population, whereas the 25 - 34 bracket is underrepresented at 9.7%. Since 2021, the 15 to 24 age bracket has risen from 12.2% to 14.1% of the population, while the 5 to 14 cohort decreased from 15.4% to 14.0%. Projections indicate that Thornleigh's age distribution will change by 2041, with the 75 to 84 age group expected to expand by 157 people (30%) from 525 to 683.

Combined senior cohorts aged 65 and above are projected to account for 96% of the total demographic growth, reflecting an aging population. Conversely, the 45 to 54 and 25 to 34 brackets are expected to contract.

Frequently Asked Questions - Age

What is the median age in the suburb of Thornleigh?
According to the latest data, the median age in the suburb of Thornleigh is 40 years.
How does the suburb of Thornleigh's median age compare to broader areas?
At 40 years, Thornleigh is 3 years older than the Greater Sydney average (37 years) and 2 years older than the national average (38 years).
What age groups are over-represented in the suburb of Thornleigh?
The most over-represented age group in the suburb of Thornleigh compared to the Greater Sydney region is the 45 - 54 group, making up 15.4% of the population.
What age groups are under-represented in the suburb of Thornleigh?
The most under-represented age group in the suburb of Thornleigh compared to the Greater Sydney region is the 25 - 34 group, making up 9.7% of the population.
Are there age groups with notable population variances?
Yes, certain age groups in the suburb of Thornleigh show significant variance compared to the Greater Sydney region. The most under-represented age group is 25-34 year-olds (9.7% vs 16.1%).
What is the percentage of children (0-14 years) in the suburb of Thornleigh?
The percentage of children aged 0-14 years in the suburb of Thornleigh is 19.4%.
What is the percentage of older people (65+ years) in the suburb of Thornleigh?
The percentage of people aged 65 and over in the suburb of Thornleigh is 15.1%.

Data & MethodBoundaries, Sources & Method for Thornleigh

Data currency Refreshed

9 of 14 data sections on this page were updated within the last 12 months — the newest current to Aug 2026.

Everything is aggregated to the Suburb (SAL) boundary shown above, on a 2021 Census baseline. Only 3 sections — housing, households and cultural diversity — still wait on the 2026 Census.

The ledger — source, cycle and currency by section

Section Source & update cycle Currency
Updated within the last 12 months 9 sections
Population ABS, GNAF, Geoscience Australia Annual (ABS ERP) May 2026 3 months ago headline measures · 2021 Census baseline
Re-based to the ABS Estimated Resident Population (June 2025 release) and updated with new dwellings from GNAF address data. Current to May 2026, with the 2021 Census supplying the small-area baseline.
Age profile ABS, Geoscience Australia, State governments Annual May 2026 3 months ago headline measures · 2021 Census baseline
Age cohorts are re-based to the latest ABS population estimates and state projections, current to May 2026. Each cohort is held as a Census baseline and a current estimate.
Development & approvals ABS, GNAF Monthly (ABS approvals) Jun 2026 2 months ago headline measures · May 2026 baseline
Property sales & rents Valuer General, Rental Board, ABS Weekly sales, quarterly rents Aug 2026 this month all 21 measures
Sales from the state Valuer General register, refreshed weekly, and rents from quarterly rental bond lodgements. Both are read live each time this page loads, current to Aug 2026.
Infrastructure projects Infrastructure Australia, State agencies, Local governments Daily Jun 2026 2 months ago all 5 projects tracked here
Project pipeline maintained continuously from Infrastructure Australia, state agencies, local government and public announcements. Records are added and revised daily; this area was last updated Jun 2026.
Employment ABS, DEWR, JSA Quarterly (ABS SALM) Mar 2026 5 months ago headline measures · 2021 Census baseline
Unemployment and labour force from ABS Small Area Labour Markets, current to Mar 2026. The growth outlook applies Department of Employment (now Jobs and Skills Australia) forecasts for all 19 industry divisions to the local industry mix, so it measures sector composition rather than local expansion and makes no allowance for population growth. Job demand comes from the same agency via its Internet Vacancy Index; industry and occupation structure from the 2021 Census.
Education ABS, ACARA Annual (ACARA) Aug 2026 this month headline measures · 2021 Census baseline
Transport ABS, State Transport Departments Each timetable release Jul 2026 last month headline measures · 2021 Census baseline
Services & amenities Provider directories, ACECQA Continuous Jul 2026 last month all 14 measures
Annual and financial-year sources 2 sections
Income ABS, ATO Annual (ATO) FY 2023 3 years ago headline measures · 2021 Census baseline
ATO taxable income statistics for FY 2023, indexed forward using the Wage Price Index. Census household income provides the distribution detail.
Health ABS, ATO Annual 2024 2 years ago headline measures · 2021 Census baseline
Census-measured — next update: 2026 Census 3 sections No more current small-area source exists for these, so they are labelled as Census-measured rather than implied to be current.
Housing ABS 5-yearly (Census) 2021 Census next update 2026 all 30 measures
Households ABS 5-yearly (Census) 2021 Census next update 2026 all 18 measures
Cultural diversity ABS, Geoscience Australia 5-yearly (Census) 2021 Census next update 2026 all 44 measures

"Currency" is the most recent release feeding that section. Where the Census supplies the structural baseline underneath a current headline figure, the row says so.

How the numbers are built

Population

The Census provides the small-area baseline, aggregated from mesh blocks to this boundary. It is then re-based to the ABS Estimated Resident Population (June 2025 release), and new dwellings built since Census night are counted from address data — 82 validated new addresses here. The headline figure is therefore a current estimate for May 2026, not a 2021 count (8,898 at the 2021 Census → 9,376 now). Annual growth rates are compound (CAGR), not simple averages.

Age profile

Cohort shares are not raw Census counts. Every cohort is held as a pair — the Census baseline and a current estimate — and the split is re-based using ERP and state population projections, current to May 2026. Median age is the Census median plus modelled change since. Charts that show both are labelled "2021 Census vs Current Estimate".

Property sales

Sourced from the state valuation authority's sales register — current, not Census, and refreshed weekly. Medians are calculated from settled transactions in the period shown; periods with very low transaction counts are flagged or suppressed, because a handful of sales can move a median substantially.

Rents

Derived from state rental bond lodgement data, by dwelling type and bedroom count. Bonds are lodged at the start of a new tenancy, so this reflects new lettings, not the whole rented stock.

Development & infrastructure

Building approvals come from current ABS releases; development applications are collected from council and state planning portals; the infrastructure pipeline is compiled from Infrastructure Australia and local government sources. Applications are matched to this boundary by address or coordinates, so very recent lodgements may not yet appear.

Employment & income

Industry and occupation structure comes from the Census, but the headline labour-market indicators do not. Unemployment and labour force are derived from ABS Small Area Labour Markets (quarterly). The employment outlook applies Department of Employment forecasts for all 19 industry divisions to this area's own industry mix (the agency is now Jobs and Skills Australia), as does the Internet Vacancy Index used for job demand. Because it is weighted on industry composition alone, that outlook carries no allowance for local population growth — in fast-growing areas the real rise in local jobs will typically be higher. Income combines Census household income with ATO taxable-income statistics for FY 2023, indexed forward using the Wage Price Index.

Education, transport & amenities

School enrolments, ICSEA and performance come from ACARA's current release, not the Census. Public transport stops and service frequency are derived from GTFS timetable feeds published by state transport departments. Services and amenities are proximity and count scores built from provider directories, refreshed on their own cycle. The Census contributes only the travel-to-work and qualification measures.

Rankings and benchmarks. Where we rank this area, the comparison set is every area of the same boundary type — suburbs against suburbs, SA2s against SA2s. Benchmarks compare this area against its greater capital city region and the national figure for the same measure and period.

Limits worth knowing. Small areas carry larger error margins, and the ABS introduces small random adjustments to Census counts to protect confidentiality — so totals may not sum exactly. Estimates re-based from regional data describe the area's expected trajectory, not a direct count of it. Figures are indicative for research and are not financial, planning or valuation advice.

Cross-check us. The Census baseline for this boundary is at ABS 2021 Census QuickStats (SAL13866). QuickStats reports 2021 only — the figures on this page are more current wherever the ledger shows a later date.

Common questions about this page

How do Thornleigh suburb boundaries differ from Statistical Areas?
This page uses Suburbs and Localities (SAL) boundaries (suburb-style geography). SAL represents commonly-known suburb names used in addresses, while Statistical Areas (SA2) are designed for census/statistical reporting. Even when sharing the same name, SAL and SA2 boundaries often cover different geographic areas with different populations.
Where does the data on this Thornleigh page come from?
AreaSearch compiles this page from official and industry sources — including ABS, Geoscience Australia, Valuer General, Provider directories, DEWR, JSA, State Transport Departments and ACARA — then aggregates them to the boundary shown and calculates the rankings, growth rates and benchmarks itself. Property sales come from the state valuation authority, rents from state rental bond lodgements, development applications from council and state planning portals, school data from ACARA, and public transport from state transport departments.
Is the Thornleigh data on this page just from the 2021 Census?
No. Most of this page is maintained well beyond the Census. Sourced entirely from current releases: development & approvals (Jun 2026), property sales & rents (Aug 2026), infrastructure projects (Jun 2026) and services & amenities (Jul 2026). Built on a Census baseline but carrying newer measures on top: population (to May 2026), age profile (to May 2026), employment (to Mar 2026), income (to FY 2023), education (to Aug 2026), transport (to Jul 2026) and health (to 2024). Population and age cohorts in particular are re-based to the latest ABS Estimated Resident Population rather than left at 2021 counts. Only housing, households and cultural diversity remain wholly Census-based, because no more current small-area dataset exists for those measures.

Nearby Areas