Thornleigh
Investment Score
78
/100
AI Intelligence Summary
Thornleigh is an established family-oriented suburb located 25km northwest of Sydney CBD in the Upper North Shore region. With a population of 8,200 and median age of 42, it attracts professionals and families seeking quality education, transport connectivity, and a balanced lifestyle. The suburb features predominantly detached houses (72%) on generous blocks with a median land size of 680sqm. Thornleigh Railway Station provides direct CBD access via the T1 Northern Line, while proximity to quality schools including Thornleigh Public School and Normanhurst Boys High School drives strong demand. The median house price of $1,450,000 reflects its desirable location, though it remains more affordable than premium North Shore suburbs. Community amenities include Thornleigh Marketplace, recreational facilities at Thornleigh Oval, and close access to Ku-ring-gai Chase National Park. With 45% professional workers, 42% university-educated residents, and strong infrastructure connectivity, Thornleigh represents a well-established suburb offering family-friendly living with solid investment fundamentals and consistent growth potential in the competitive North Shore market.
Strengths
- •Direct train access to Sydney CBD via T1 Northern Line
- •Proximity to highly-rated public and private schools
- •Established family-friendly community with quality amenities
- •Close to national parks and recreational facilities
Opportunities
- •Potential for house renovations and extensions on large blocks
- •Growing demand from families seeking North Shore education
- •Infrastructure improvements benefiting broader region
- •Increasing appeal as affordable North Shore alternative
Considerations
- •Limited new development opportunities due to established nature
- •Competition from premium North Shore suburbs
- •Moderate rental yields compared to other investment areas
- •Distance from beach and coastal amenities
Property Market
$1.45M
+4.2% 1yr
$680K
+3.8% 1yr
$950K
$890/wk
$535/wk
42
1.8%
72.0%
Price Growth
| Type | 1 Year | 3 Year | 5 Year |
|---|---|---|---|
| House | +4.2% | +18.5% | +35.8% |
| Unit | +3.8% | +16.2% | +32.1% |
Rental Yields
House Yield
3.2%
Unit Yield
4.1%
Townhouse Yield
3.5%
Investment Scorecard
Demand/Supply Ratio: 1.40
Demand exceeds supply — favourable for sellers
Tax & Financial Intelligence
CPA-grade analysis for Thornleigh at median house price
+8% surcharge
$890/wk
Negatively geared
Reduces taxable income
~$767/week
Based on 7.2% p.a. growth (from 5-year trend), 50% CGT discount, 39% MTR
5-Year Hold
10-Year Hold
Investor Quick Summary
Entry cost (stamp duty)
$62,140
After-tax yield
1.95%
Weekly holding cost
$767/wk
10yr CGT (est.)
$268,304
Estimates based on FY2025 NSW rates at median house price. Assumes 80% LVR, 6.5% interest rate, 39% marginal tax rate ($135K-$190K bracket). Individual circumstances vary. This is general information only and not personal financial advice. Consult your CPA before making investment decisions. Local Knowledge Pty Ltd — Registered Tax Agent.
Demographics
8,200
42
$95K
per annum
58.0%
45.0%
42.0%
3.2%
38.0%
Dwelling Mix
Lifestyle & Community
18
12
1
25.0 km
Nearest Station: Thornleigh Railway Station
Family-friendly lifestyle with access to parks, recreational facilities, quality schools, and convenient transport to Sydney CBD while maintaining suburban tranquility.
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Data sourced from multiple sources. Last updated 29 March 2026.