Sadleir flood map & planning overlays
A planning-constraint profile of Sadleir
(Liverpool, NSW) - 0.9 km², mapped from live council and
state overlay data. This suburb is moderately constrained.
Profile updated 3 October 2026.
Suburb-wide figures; the free map shows which overlays touch your lot.
Constraint readout
0.9 km² - this suburb is moderately constrained by planning overlays.
Elevation hillshade with street names, clipped to Sadleir'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 Sadleir
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 11 a day
Night movements: observed, lowest 4,500 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.
Sadleir at a glance
How Sadleir is zoned
Buying in Sadleir? 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 0.9 km², Sadleir is moderately constrained by planning overlays. About 17% of the suburb sits within a mapped flood overlay, and 7% is flagged bushfire-prone. There are 2 heritage-listed sites on record, and the dominant land-use zone is Low Density Residential. The median lot measures about 598 m² across 950 parcels.
Who lives in Sadleir
Census 2021 figures published by the ABS for the Sadleir 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 768, and decile 1 within New South Wales. The national average is 1000.
Age profile
Share of Sadleir's 3,243 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Ashcroft - Busby - Miller, the wider ABS statistical area containing Sadleir. There is no annual population series published at suburb level, so this describes the surrounding area rather than Sadleir itself.
16,934 in 2001 to 18,381 in 2025, up 9%.
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.
Sadleir 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 Sadleir 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 100% of Sadleir. 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 Sadleir. 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 Sadleir lot.
See what's in the $9 report →Sadleir planning - frequently asked
Is Sadleir flood-prone?
About 17% of Sadleir falls within a mapped flood overlay, against the council-wide suburb average of 24%. Published flood models are held over parts of Sadleir; the free check on the Flood Model Report page says whether one reaches a given address.
Is Sadleir bushfire-prone?
Around 7% of Sadleir is mapped as bushfire-prone, compared with a Liverpool average of 41%.
Is Sadleir under a flight path?
Aircraft were observed below 3,000 ft over about 100% of Sadleir, 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 14 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 Sadleir?
The dominant planning zone in Sadleir is Low Density Residential, though the suburb also includes Medium Density Residential and Public Recreation.
Does Sadleir have heritage-listed places?
Sadleir has 2 heritage-listed places on record.
What is the typical lot size in Sadleir?
Across 950 surveyed parcels in Sadleir, the median lot size is about 598 m². There are also 1 registered easements mapped in the suburb.
Does Sadleir have a train station?
There is no train station inside Sadleir itself. The suburb is served by 31 bus stops.
What is the population of Sadleir?
At the 2021 Census Sadleir had 3,243 usual residents, with a median age of 33 and an average household size of 3.0 people. The wider Ashcroft - Busby - Miller statistical area, which contains Sadleir, went from 16,934 people in 2001 to 18,381 in 2025, up 9%.
Is Sadleir an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Sadleir scores 768 and sits in decile 1 of 10 nationally and decile 1 within New South Wales (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Sadleir?
Median household income in Sadleir was $946 a week at the 2021 Census, against $1,959 for the typical suburb in Liverpool. Median rent was $250 a week and the median mortgage repayment $1,878 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Ashcroft | 0.8 km | 28% | 24% |
| Cartwright | 0.9 km | 28% | 44% |
| Heckenberg | 1.0 km | 8% | 4% |
| Miller | 1.0 km | 27% | 17% |
| Busby | 1.1 km | 9% | 0% |
| Mount Pritchard Fairfield |
1.7 km | 18% | 4% |
| Lurnea | 2.3 km | 14% | <1% |
| Hinchinbrook | 2.3 km | 18% | 16% |
| Green Valley | 2.5 km | 4% | 2% |
| Bonnyrigg Fairfield |
2.6 km | 8% | 6% |