Suburb-level context for Dee Why from official sources, and the address-level red, yellow and green flags we check before you make an offer or sign a lease.
Property offences only, per 100,000 residents, latest 12 months (Apr 2025–Mar 2026). Population 23,354 (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), © State of New South Wales (Department of Communities and Justice), CC BY 4.0, and the Australian Bureau of Statistics (CC BY 4.0), snapshot 2026-07-24.
67 development applications lodged for Dee Why addresses between 2025-08-26 and 2026-08-26, with a combined stated cost of $128.0 million and 171 new dwellings proposed.
Largest by stated cost:
Source: NSW Planning Portal Online DA data (public record), applications by lodgement date, snapshot 2026-08-26. Costs are applicant-stated estimates. The paid address report checks applications around a specific address, not just this suburb-wide list.
The ABS area covering Dee Why (Dee Why - North) is projected to go from 17,921 residents (2021) to 18,942 by 2041, a change of +5.7%, passing 18,550 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.
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 real estate agent.
Run a free flag count on an address in Dee Why → · See a sample report · All NSW suburbs
Guides: how flood risk really works in NSW · checking building defect orders · the full due diligence checklist · buying at auction · contaminated land checks · flight path and noise checks
Is Dee Why safe?
There is no single answer to that for any suburb, but the official numbers say this: across 5 property crime categories, Dee Why sits above the NSW average in 0 and below it in 5, on BOCSAR figures for Apr 2025 to Mar 2026. These are rates for the whole suburb, not any one street, and safety also depends on things no crime table shows. The table above lists each category against the NSW rate.
Is Dee Why flood prone?
A suburb page cannot honestly answer that: flood planning areas are mapped lot by lot, and two houses on the same street can differ. The free PropertyFlags check looks up the actual address against the NSW flood planning layer, along with bushfire, contamination and other hazard maps.
Is Dee Why growing?
The ABS area covering Dee Why (Dee Why - North) is projected to go from 17,921 residents in 2021 to 18,942 by 2041, a change of +5.7%. Projections are planning inputs, not guarantees.
What does a property report for Dee Why include?
For one address: flood and bushfire mapping, zoning and height controls, EPA contamination records, serious defect orders, development applications within 500 m, aircraft, rail and road noise, school catchments, winter sun and more, each finding named with the government register it came from, as red, yellow and green flags.
Allambie Heights · Beacon Hill · Brookvale · Cromer · Narraweena · North Curl Curl · North Manly
Suburbs sharing or adjoining postcode 2099; each page carries the same official crime and growth data as this one.