Bonnet Bay flood map & planning overlays
A planning-constraint profile of Bonnet Bay
(Sutherland Shire, NSW) - 1.47 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
1.47 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Bonnet Bay'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 Bonnet Bay
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 2 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.
Bonnet Bay at a glance
How Bonnet Bay is zoned
Buying in Bonnet Bay? 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 1.47 km², Bonnet Bay is highly constrained by planning overlays. About 36% of the suburb sits within a mapped flood overlay, and 59% is flagged bushfire-prone. There is 1 heritage-listed site on record, and the dominant land-use zone is Environmental Management. The median lot measures about 638 m² across 830 parcels.
Who lives in Bonnet Bay
Census 2021 figures published by the ABS for the Bonnet Bay 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 1152, and decile 10 within New South Wales. The national average is 1000.
Age profile
Share of Bonnet Bay's 2,238 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Oyster Bay - Como - Jannali, the wider ABS statistical area containing Bonnet Bay. There is no annual population series published at suburb level, so this describes the surrounding area rather than Bonnet Bay itself.
21,252 in 2001 to 22,878 in 2025, up 8%.
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.
Bonnet Bay 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 Bonnet Bay 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 9% of Bonnet Bay. The report's Aircraft Overflight page narrows that to the address itself: how many aircraft a day, how low, and at what heights.
Building or pricing a slab? The $119 geotechnical desktop report covers geology, soils, bores and an indicative AS 2870 site class for a Bonnet Bay lot.
See what's in the $9 report →Bonnet Bay planning - frequently asked
Is Bonnet Bay flood-prone?
About 36% of Bonnet Bay falls within a mapped flood overlay, against the council-wide suburb average of 22%.
Is Bonnet Bay bushfire-prone?
Around 59% of Bonnet Bay is mapped as bushfire-prone, compared with a Sutherland Shire average of 46%.
Is Bonnet Bay under a flight path?
Aircraft were observed below 3,000 ft over about 9% of Bonnet Bay, and over about 89% at any altitude up to 10,000 ft, in the period sampled (4 Sep 2026 to 25 Sep 2026). The lowest measured aircraft was at 1,500 ft, with an average of 6,000 ft. At the busiest point in the suburb about 19 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 Bonnet Bay?
The dominant planning zone in Bonnet Bay is Environmental Management, though the suburb also includes Environmental Conservation and Natural Waterways.
Does Bonnet Bay have heritage-listed places?
Bonnet Bay has 1 heritage-listed place on record.
What is the typical lot size in Bonnet Bay?
Across 830 surveyed parcels in Bonnet Bay, the median lot size is about 638 m². There are also 10 registered easements mapped in the suburb.
Does Bonnet Bay have a train station?
There is no train station inside Bonnet Bay itself. The suburb is served by 72 bus stops.
What is the population of Bonnet Bay?
At the 2021 Census Bonnet Bay had 2,238 usual residents, with a median age of 44 and an average household size of 3.0 people. The wider Oyster Bay - Como - Jannali statistical area, which contains Bonnet Bay, went from 21,252 people in 2001 to 22,878 in 2025, up 8%.
Is Bonnet Bay an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Bonnet Bay scores 1152 and sits in decile 10 of 10 nationally and decile 10 within New South Wales (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Bonnet Bay?
Median household income in Bonnet Bay was $3,087 a week at the 2021 Census, against $2,626 for the typical suburb in Sutherland Shire. Median rent was $700 a week and the median mortgage repayment $3,000 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Como | 1.3 km | 24% | 21% |
| Jannali | 1.5 km | 0% | 33% |
| Woronora | 1.6 km | 39% | 81% |
| Illawong | 1.7 km | 22% | 58% |
| Bangor | 2.1 km | 10% | 73% |
| Oyster Bay | 2.6 km | 34% | 11% |
| Kareela | 2.7 km | 8% | 12% |
| Sutherland | 2.8 km | <1% | 25% |
| Kirrawee | 3.1 km | <1% | 13% |
| Lugarno Georges River |
3.2 km | 27% | 49% |