Thornleigh vs Westleigh: true annual running costs compared (2026)
Last updated July 2026 · council rates current NSW schedules, ATO 88c/km, Opal & Translink fares, AER electricity benchmarks
Thornleigh and Westleigh are both Hornsby rates (OLG suburbs, sitting 19.7 km and 21.7 km from Sydney CBD respectively, and are commonly compared by buyers weighing up running costs within the same council area.
Thornleigh runs $726 a year cheaper than Westleigh, driven mostly by home insurance. Over 10 years at 3% growth that gap compounds to about $8,323.
Over 10 years, Thornleigh costs about $8,300 less to run than Westleigh — the same as paying $8,300 less for the home. It's the cost no listing shows you.
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Westleigh
Annual cost breakdown
| Category | Thornleigh | Westleigh | Difference |
|---|---|---|---|
| Council rates | $1,541 | $1,541 | - |
| Water & sewerage | $1,548 | $1,548 | - |
| Commute (driving) | $5,018 | $5,344 | -$326 |
| Commute (public transport) | $2,386 | $2,400 | -$14 |
| Home insurance | $2,150 | $2,550 | -$400 |
| Body corporate (unit) | $2,300 | $2,300 | - |
| Total (driving) | $10,257 | $10,983 | -$726 |
| Total (public transport) | $7,625 | $8,039 | -$414 |
Green = cheaper. Commute: ATO 88c/km, 220 working days. Insurance AI-estimated; actual premiums vary. Council rates: average residential rate (NSW, IPART-uplifted).
| Dwelling | Thornleigh | Westleigh | Difference |
|---|---|---|---|
| House | $2,148 | $2,148 | - |
| Unit | $1,716 | $1,716 | - |
Estimated from AER residential benchmarks for each suburb's climate zone at 2025 rates (QLD 30c/kWh, NSW 33c/kWh incl. supply charge; unit ≈ 75% of a house). Get the free report for a breakdown by your exact number of occupants.
Cost breakdown chart
Annual cost breakdown — Thornleigh vs Westleigh (2026-27)
What the numbers show
Thornleigh costs $726 less per year to run by car. Held over ten years at 3% annual cost growth, that gap compounds to $8,323 in favour of Thornleigh.
The biggest single gap is home insurance at $400 per year.
On public transport the gap is $414 per year, $7,625 from Thornleigh versus $8,039 from Westleigh.
10-year cumulative cost projection
| Year | Thornleigh cumulative | Westleigh cumulative | Difference |
|---|---|---|---|
| Year 1 | $10,257 | $10,983 | $726 |
| Year 3 | $31,703 | $33,947 | $2,244 |
| Year 5 | $54,456 | $58,310 | $3,854 |
| Year 10 | $117,585 | $125,908 | $8,323 |
Assumes 3% annual cost growth. Excludes purchase price, mortgage, and personal expenses.
Frequently asked questions
Is Thornleigh or Westleigh cheaper to live in?
Thornleigh is cheaper to run by car at $10,257 per year versus $10,983 for Westleigh, a difference of $726 annually. Figures cover council rates, water, commute (ATO 88c/km), and home insurance. Source: SuburbCost 2026 data.
What are council rates in Thornleigh and Westleigh?
Annual council rates for a house are $1,541 in Thornleigh (Hornsby rates (OLG) and $1,541 in Westleigh (Hornsby rates (OLG). Water and sewerage adds $1,548 in Thornleigh and $1,548 in Westleigh. Both figures are the average residential rate reported to the Office of Local Government, uplifted by each council's IPART rate peg.
How does the commute cost compare between Thornleigh and Westleigh?
Annual driving commute costs are $5,018 from Thornleigh and $5,344 from Westleigh to Sydney CBD (ATO 88c/km). Public transport costs $2,386 from Thornleigh and $2,400 from Westleigh.
What is the 10-year cost difference between Thornleigh and Westleigh?
At 3% annual cost growth, Thornleigh costs a cumulative $117,585 and Westleigh costs $125,908 over 10 years by car. The cumulative difference is $8,323 in favour of Thornleigh. Excludes purchase price, mortgage, and personal expenses.
Which of Thornleigh and Westleigh is best to actually live in?
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Related comparisons
Sources: Hornsby rates (OLG and Hornsby rates (OLG rate data, water utility pricing (QLD: Queensland Urban Utilities / Unitywater; NSW: Sydney Water / Hunter Water), ATO 88c/km, and SuburbCost AI insurance estimates. Data updated July 2026.