Brownlow Hill flood map & planning overlays
A planning-constraint profile of Brownlow Hill
(Wollondilly, NSW) - 18.0 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
18.0 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Brownlow Hill'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 Brownlow Hill
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 2 a day
Night movements: observed, lowest 1,000 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.
Brownlow Hill at a glance
How Brownlow Hill is zoned
Buying in Brownlow Hill? 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 18.0 km², Brownlow Hill is highly constrained by planning overlays. Flood mapping covers the suburb and none of it falls within a mapped flood overlay, and 87% is flagged bushfire-prone. There are 10 heritage-listed sites on record, and the dominant land-use zone is Rural Landscape. The median lot measures about 21,864 m² across 108 parcels.
Who lives in Brownlow Hill
Census 2021 figures published by the ABS for the Brownlow Hill 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 1080, and decile 9 within New South Wales. The national average is 1000.
Age profile
Share of Brownlow Hill's 384 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of The Oaks - Oakdale, the wider ABS statistical area containing Brownlow Hill. There is no annual population series published at suburb level, so this describes the surrounding area rather than Brownlow Hill itself.
7,821 in 2001 to 10,429 in 2025, up 33%.
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.
Brownlow Hill 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 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 Brownlow Hill 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 98% of Brownlow Hill. 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 Brownlow Hill lot.
See what's in the $9 report →Brownlow Hill planning - frequently asked
Is Brownlow Hill flood-prone?
Flood mapping covers Brownlow Hill and none of the suburb falls within a mapped flood overlay (the council-wide suburb average is 0%).
Is Brownlow Hill bushfire-prone?
Around 87% of Brownlow Hill is mapped as bushfire-prone, compared with a Wollondilly average of 93%.
Is Brownlow Hill under a flight path?
Aircraft were observed below 3,000 ft over about 98% of Brownlow Hill, and over about 100% 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 500 ft, with an average of 1,500 ft. At the busiest point in the suburb about 57 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 Brownlow Hill?
The dominant planning zone in Brownlow Hill is Rural Landscape, though the suburb also includes Special Activities and Primary Production.
Does Brownlow Hill have heritage-listed places?
Brownlow Hill has 10 heritage-listed places on record.
What is the typical lot size in Brownlow Hill?
Across 108 surveyed parcels in Brownlow Hill, the median lot size is about 21,864 m². There are also 2 registered easements mapped in the suburb.
Does Brownlow Hill have a train station?
There is no train station inside Brownlow Hill itself. The suburb is served by 33 bus stops.
What is the population of Brownlow Hill?
At the 2021 Census Brownlow Hill had 384 usual residents, with a median age of 37 and an average household size of 3.2 people. The wider The Oaks - Oakdale statistical area, which contains Brownlow Hill, went from 7,821 people in 2001 to 10,429 in 2025, up 33%.
Is Brownlow Hill an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Brownlow Hill scores 1080 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 Brownlow Hill?
Median household income in Brownlow Hill was $2,349 a week at the 2021 Census, against $2,250 for the typical suburb in Wollondilly. Median rent was $360 a week and the median mortgage repayment $2,700 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Grasmere Camden |
3.0 km | 0% | 61% |
| Ellis Lane Camden |
3.1 km | 0% | 30% |
| Bickley Vale Camden |
4.3 km | 0% | 94% |
| Camden Camden |
4.9 km | 0% | 52% |
| Orangeville | 5.2 km | 0% | 97% |
| Glenmore | 5.2 km | Not mapped | 100% |
| Theresa Park | 6.2 km | 0% | 74% |
| Cawdor | 6.3 km | 0% | 98% |
| Kirkham Camden |
6.3 km | 64% | 79% |
| Mount Hunter | 6.4 km | 0% | 98% |