Hillier flood map & planning overlays
A planning-constraint profile of Hillier
(Town of Gawler, SA) - 6.87 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
6.87 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Hillier'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 Hillier
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 3 Oct 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.
Hillier at a glance
How Hillier is zoned
Selling in Hillier? The zone and overlays on this page are the Planning and Design Code controls a Form 1 vendor's statement has to disclose.
Across its 6.87 km², Hillier is highly constrained by planning overlays. About 52% of the suburb sits within a mapped flood overlay, and 100% is flagged bushfire-prone. There are 4 heritage-listed sites on record, and the dominant land-use zone is Rural. The median lot measures about 20,199 m² across 248 parcels.
Who lives in Hillier
Census 2021 figures published by the ABS for the Hillier 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 912, and decile 2 within South Australia. The national average is 1000.
Age profile
Share of Hillier's 814 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Gawler - South, the wider ABS statistical area containing Hillier. There is no annual population series published at suburb level, so this describes the surrounding area rather than Hillier itself.
15,284 in 2001 to 24,176 in 2025, up 58%.
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.
Hillier 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 | the South Australian Planning and Design Code and Location SA spatial data |
| Bushfire-prone mapping | Mapped | the South Australian Planning and Design Code and Location SA spatial data |
| Zoning | Mapped | the South Australian Planning and Design Code and Location SA spatial data |
| Heritage and environment | Mapped where published | the South Australian Planning and Design Code and Location SA spatial data |
| Aircraft noise contours (ANEF) | Not held | the South Australian Planning and Design Code and Location SA spatial data, 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 Hillier 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 23% of Hillier. 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 Hillier lot.
See what's in the $9 report →Hillier planning - frequently asked
Is Hillier flood-prone?
About 52% of Hillier falls within a mapped flood overlay, against the council-wide suburb average of 38%.
Is Hillier bushfire-prone?
Around 100% of Hillier is mapped as bushfire-prone, compared with a Town of Gawler average of 73%.
Is Hillier under a flight path?
Aircraft were observed below 3,000 ft over about 23% of Hillier, and over about 59% at any altitude up to 10,000 ft, in the period sampled (4 Sep 2026 to 3 Oct 2026). The lowest measured aircraft was at 500 ft, with an average of 2,000 ft. At the busiest point in the suburb about 3 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 Hillier?
The dominant planning zone in Hillier is Rural, though the suburb also includes Rural Horticulture and Residential Park.
Does Hillier have heritage-listed places?
Hillier has 4 heritage-listed places on record.
What is the typical lot size in Hillier?
Across 248 surveyed parcels in Hillier, the median lot size is about 20,199 m². There are also 16 registered easements mapped in the suburb.
Does Hillier have a train station?
There is no train station inside Hillier itself. The suburb is served by 2 bus stops.
What is the population of Hillier?
At the 2021 Census Hillier had 814 usual residents, with a median age of 67 and an average household size of 1.9 people. The wider Gawler - South statistical area, which contains Hillier, went from 15,284 people in 2001 to 24,176 in 2025, up 58%.
Is Hillier an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Hillier scores 912 and sits in decile 2 of 10 nationally and decile 2 within South Australia (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Hillier?
Median household income in Hillier was $712 a week at the 2021 Census, against $1,374 for the typical suburb in Town of Gawler. Median rent was $255 a week and the median mortgage repayment $1,473 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Buchfelde Light Regional Council |
2.2 km | 22% | 100% |
| Evanston Gardens | 2.4 km | 37% | 80% |
| Kudla | 2.6 km | 41% | 100% |
| Munno Para Downs City of Playford |
2.8 km | 35% | 60% |
| Gawler River Light Regional Council |
3.5 km | 51% | 100% |
| Evanston | 3.9 km | 32% | 45% |
| Reid | 4.0 km | 59% | 92% |
| Evanston South | 4.1 km | 22% | 90% |
| Munno Para West City of Playford |
4.3 km | 29% | 4% |
| Gawler West | 4.3 km | 79% | 44% |