Brereton flood map & planning overlays
A planning-constraint profile of Brereton
(Wollondilly, NSW) - 58.18 km², mapped from live council and
state overlay data. This suburb is highly constrained.
Profile updated 3 October 2026.
Suburb-wide figures; the free map shows which overlays touch your lot.
Constraint readout
58.18 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Brereton'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 Brereton
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 2 Oct 2026
typical observed square 1 a day
Night movements: observed, lowest 5,000 ft - night is sampled as often as day, but night traffic is light, so this is a floor and no rate can be put on it.
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.
Brereton at a glance
How Brereton is zoned
Buying in Brereton? 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 58.18 km², Brereton is highly constrained by planning overlays. Flood mapping covers the suburb and none of it falls within a mapped flood overlay, and 97% is flagged bushfire-prone. There are 2 heritage-listed sites on record, and the dominant land-use zone is National Parks and Nature Reserves. The median lot measures about 176,953 m² across 13 parcels.
Brereton 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 | Not available | Australian Bureau of Statistics (2021 Census and SEIFA) |
Profile last materially updated 3 October 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 Brereton 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 10% of Brereton. 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 Brereton lot.
See what's in the $9 report →Brereton planning - frequently asked
Is Brereton flood-prone?
Flood mapping covers Brereton and less than 1% of the suburb falls within a mapped flood overlay (the council-wide suburb average is 0%).
Is Brereton bushfire-prone?
Around 97% of Brereton is mapped as bushfire-prone, compared with a Wollondilly average of 93%.
Is Brereton under a flight path?
Aircraft were observed below 3,000 ft over about 10% of Brereton, and over about 56% at any altitude up to 10,000 ft, in the period sampled (4 Sep 2026 to 2 Oct 2026). The lowest measured aircraft was at 1,000 ft, with an average of 5,500 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 Brereton?
The dominant planning zone in Brereton is National Parks and Nature Reserves, though the suburb also includes Infrastructure.
Does Brereton have heritage-listed places?
Brereton has 2 heritage-listed places on record.
What is the typical lot size in Brereton?
Across 13 surveyed parcels in Brereton, the median lot size is about 176,953 m².
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Massif Ridge Blue Mountains |
7.1 km | <1% | 100% |
| Silverdale | 8.3 km | <1% | 92% |
| Warragamba | 9.0 km | 2% | 88% |
| Werombi | 10.6 km | 0% | 93% |
| Ingar Blue Mountains |
12.2 km | Not mapped | 100% |
| Wallacia Liverpool |
12.6 km | 31% | 88% |
| Mount Portal Blue Mountains |
13.5 km | 6% | 100% |
| Kedumba | 13.8 km | Not mapped | 94% |
| Theresa Park | 14.7 km | 0% | 74% |
| Greendale Liverpool |
15.0 km | 14% | 96% |