PropertyFlags · suburb data

Thornleigh NSW — property data & flags

Suburb-level context for Thornleigh from official sources — and the address-level red, yellow and green flags we check before you make an offer or sign a lease.

Check an address in Thornleigh — free flag count →

Property crime — Thornleigh vs NSW

Break-ins to homes
134.9 incidents per 100,000 residents · 36% below the NSW rate (212.3) · higher than 44% of NSW suburbs
Car theft
45 incidents per 100,000 residents · 74% below the NSW rate (171.2) · higher than 16% of NSW suburbs
Theft from cars
179.8 incidents per 100,000 residents · 39% below the NSW rate (295.4) · higher than 37% of NSW suburbs
Theft from homes
67.4 incidents per 100,000 residents · 66% below the NSW rate (196.2) · higher than 23% of NSW suburbs
Malicious property damage
213.5 incidents per 100,000 residents · 61% below the NSW rate (553.8) · higher than 16% of NSW suburbs

Property offences only, per 100,000 residents, latest 12 months (Apr 2025–Mar 2026). Population 8,898 (2021 Census). Percentile computed across the 945 NSW suburbs with 2,000+ residents. Suburb-wide figures, not any one street. Violent-crime categories are deliberately not shown. Data sourced from the NSW Bureau of Crime Statistics and Research (BOCSAR) and the Australian Bureau of Statistics, snapshot 2026-07-24.

What's coming to Thornleigh

The ABS area covering Thornleigh (Normanhurst - Thornleigh - Westleigh) is projected to go from 19,205 residents (2021) to 20,071 by 2041 — a change of +4.5%, passing 19,805 by 2031.

Population figures are projections (DPHI 2024 NSW Population Projections (2022–2041 series)) for the ABS statistical area, not a guarantee. Project lists: School Infrastructure NSW and Health Infrastructure / Homes NSW public project pages (snapshot 2026-07-26); a "Planning" status is not a commitment — projects change, slip and get cancelled. The paid address report adds state-budget projects and growth-area checks around the specific address.

What we check at the address level

Suburb averages can't tell you about one specific property. The full PropertyFlags report checks the address itself against official government layers — flood and bushfire mapping, zoning and height controls, development applications nearby, EPA contamination records, defect orders, aircraft and road noise, school catchments and more — and turns them into red, yellow and green flags with the questions to ask the agent.

Run a free flag count on an address in Thornleigh → · See a sample report · All NSW suburbs