Dangar Island flood map & planning overlays
A planning-constraint profile of Dangar Island
(Hornsby, NSW) - 0.3 km², mapped from live council and
state overlay data. This suburb is highly constrained.
Profile updated 26 September 2026.
Suburb-wide figures; the free map shows which overlays touch your lot.
Constraint readout
0.3 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Dangar Island's boundary, with the flood, bushfire and environmental overlays drawn on top. Magenta is where aircraft were observed in the sampled period, brightest below 3,000 ft.
Nearby suburbs, nearest first
Aircraft noise and flight paths over Dangar Island
Two different things, kept apart on purpose. The ANEF contour is the planning instrument - a forecast published per airport that planning schemes use to control noise-sensitive development. Observed overflight is what a sampled aircraft-tracking feed actually recorded over the suburb - where aircraft flew, how low and how often.
Observed overflight - sampled 4 Sep to 25 Sep 2026
typical observed square 1 a day
Night movements: not established - night is sampled as often as day, but too few night flights have been seen here to conclude either way.
Traffic is sampled rather than watched continuously, so every figure is a floor: aircraft not captured between samples are not represented. Rates are per 500 m square - the busiest square in the suburb, not a count of flights over the suburb - and a square is only rated where enough traffic was seen to measure it. Altitudes are above mean sea level. Flight paths change with runway use, weather, season and airspace design. This is a record of observed traffic; it is not a noise contour and not a planning control.
Dangar Island at a glance
How Dangar Island is zoned
Buying in Dangar Island? The zoning, flood and bushfire lines on the section 10.7 certificate attached to the contract are mapped controls - see our s10.7 certificate guide.
Across its 0.3 km², Dangar Island is highly constrained by planning overlays. About 6% of the suburb sits within a mapped flood overlay, and 56% is flagged bushfire-prone. There are 16 heritage-listed sites on record, and the dominant land-use zone is Environmental Living. The median lot measures about 786 m² across 269 parcels.
Who lives in Dangar Island
Census 2021 figures published by the ABS for the Dangar Island suburb boundary itself, not a wider region.
Socio-economic standing
ABS SEIFA 2021 ranks every Australian suburb. Decile 1 is the most disadvantaged tenth of the country, decile 10 the least.
Score 1078, and decile 9 within New South Wales. The national average is 1000.
Age profile
Share of Dangar Island's 313 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Berowra - Brooklyn - Cowan, the wider ABS statistical area containing Dangar Island. There is no annual population series published at suburb level, so this describes the surrounding area rather than Dangar Island itself.
11,707 in 2001 to 11,761 in 2025, up 0%.
Source: ABS Census 2021 and SEIFA 2021 (Suburbs and Localities), Regional Population (SA2), CC BY 4.0. Small counts are randomly adjusted by the ABS.
Dangar Island data sources and coverage
“Not mapped” means we hold no source layer for this suburb - never an all-clear.
| Dataset | Coverage | Publisher |
|---|---|---|
| Flood mapping | Mapped | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Bushfire-prone mapping | Mapped | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Zoning | Mapped | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Heritage and environment | Mapped where published | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Aircraft noise contours (ANEF) | Not held | NSW Government spatial services, NSW ePlanning and published council flood studies, Defence |
| Observed flight paths | Observed | adsb.lol, under the Open Database License |
| Demographics | Available | Australian Bureau of Statistics (2021 Census and SEIFA) |
Profile last materially updated 26 September 2026. See the methodology and full source list. Source data changes over time and critical decisions should be checked with the responsible authority.
Check a specific Dangar Island address
See exactly which overlays touch a single property - the interactive map is free. Need it on paper? A full planning PDF is just $9.
Aircraft have been seen below 3,000 ft over about 59% of Dangar Island. The report's Aircraft Overflight page narrows that to the address itself: how many aircraft a day, how low, and at what heights.
Published flood models are held over parts of Dangar Island. The free check tells you whether one reaches an address; where it does, a Flood Model Report is +$9 with the planning report.
Building or pricing a slab? The $119 geotechnical desktop report covers geology, soils, bores and an indicative AS 2870 site class for a Dangar Island lot.
See what's in the $9 report →Dangar Island planning - frequently asked
Is Dangar Island flood-prone?
About 6% of Dangar Island falls within a mapped flood overlay, against the council-wide suburb average of 10%. Published flood models are held over parts of Dangar Island; the free check on the Flood Model Report page says whether one reaches a given address.
Is Dangar Island bushfire-prone?
Around 56% of Dangar Island is mapped as bushfire-prone, compared with a Hornsby average of 70%.
Is Dangar Island under a flight path?
Aircraft were observed below 3,000 ft over about 59% of Dangar Island, in the period sampled (4 Sep 2026 to 25 Sep 2026). The lowest measured aircraft was at 1,000 ft, with an average of 2,000 ft. At the busiest point in the suburb about 1 aircraft a day were recorded passing over one 500 m square. Traffic is sampled rather than watched continuously and flight paths change with runway use, weather and season; the ANEF contour is the planning instrument.
What is the zoning in Dangar Island?
The dominant planning zone in Dangar Island is Environmental Living, though the suburb also includes Public Recreation and Natural Waterways.
Does Dangar Island have heritage-listed places?
Dangar Island has 16 heritage-listed places on record.
What is the typical lot size in Dangar Island?
Across 269 surveyed parcels in Dangar Island, the median lot size is about 786 m².
Does Dangar Island have a train station?
There is no train station inside Dangar Island itself. The suburb is served by 1 ferry terminal.
What is the population of Dangar Island?
At the 2021 Census Dangar Island had 313 usual residents, with a median age of 56 and an average household size of 2.2 people. The wider Berowra - Brooklyn - Cowan statistical area, which contains Dangar Island, went from 11,707 people in 2001 to 11,761 in 2025, up 0%.
Is Dangar Island an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Dangar Island scores 1078 and sits in decile 10 of 10 nationally and decile 9 within New South Wales (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Dangar Island?
Median household income in Dangar Island was $1,857 a week at the 2021 Census, against $2,468 for the typical suburb in Hornsby. Median rent was $420 a week and the median mortgage repayment $2,134 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Little Wobby Central Coast |
1.4 km | 58% | 52% |
| Cogra Bay Central Coast |
2.0 km | 9% | 100% |
| Mooney Mooney Central Coast |
3.2 km | 80% | 31% |
| Patonga Central Coast |
3.8 km | 15% | 62% |
| Wondabyne Central Coast |
3.9 km | 16% | 90% |
| Brooklyn | 4.7 km | 16% | 72% |
| Cheero Point Central Coast |
5.4 km | 6% | 94% |
| Woy Woy Central Coast |
5.6 km | 34% | 62% |
| Pearl Beach Central Coast |
6.0 km | 17% | 79% |
| Milsons Passage | 6.3 km | 77% | 44% |