Seddon flood map & planning overlays
A planning-constraint profile of Seddon
(Kangaroo Island Council, SA) - 259.49 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
259.49 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Seddon'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 Seddon
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 26 Sep 2026
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.
Seddon at a glance
How Seddon is zoned
Selling in Seddon? 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 259.49 km², Seddon is highly constrained by planning overlays. Flood mapping covers the suburb and none of it falls within a mapped flood overlay, and 100% is flagged bushfire-prone. There are 2 heritage-listed sites on record, and the dominant land-use zone is Rural. The median lot measures about 1,774,113 m² across 108 parcels.
Who lives in Seddon
Census 2021 figures published by the ABS for the Seddon 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 992, and decile 6 within South Australia. The national average is 1000.
Age profile
Share of Seddon's 107 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Kangaroo Island, the wider ABS statistical area containing Seddon. There is no annual population series published at suburb level, so this describes the surrounding area rather than Seddon itself.
4,227 in 2001 to 5,212 in 2025, up 23%.
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.
Seddon 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 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 Seddon 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.
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 Seddon lot.
See what's in the $9 report →Seddon planning - frequently asked
Is Seddon flood-prone?
Flood mapping covers Seddon and none of the suburb falls within a mapped flood overlay (the council-wide suburb average is 7%).
Is Seddon bushfire-prone?
Around 100% of Seddon is mapped as bushfire-prone, compared with a Kangaroo Island Council average of 96%.
Is Seddon under a flight path?
Aircraft were observed over about 2% of Seddon in the period sampled, but only above 3,000 ft - the lowest measured was 1,500 ft. 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 Seddon?
The dominant planning zone in Seddon is Rural, though the suburb also includes Rural Living and Conservation.
Does Seddon have heritage-listed places?
Seddon has 2 heritage-listed places on record.
What is the typical lot size in Seddon?
Across 108 surveyed parcels in Seddon, the median lot size is about 1,774,113 m².
What is the population of Seddon?
At the 2021 Census Seddon had 107 usual residents, with a median age of 37 and an average household size of 2.9 people. The wider Kangaroo Island statistical area, which contains Seddon, went from 4,227 people in 2001 to 5,212 in 2025, up 23%.
Is Seddon an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Seddon scores 992 and sits in decile 6 of 10 nationally and decile 6 within South Australia (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Seddon?
Median household income in Seddon was $1,708 a week at the 2021 Census, against $1,249 for the typical suburb in Kangaroo Island Council. Median rent was $125 a week and the median mortgage repayment $663 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Parndana | 8.8 km | 0% | 100% |
| Seal Bay | 12.9 km | 0% | 100% |
| Newland | 14.3 km | 0% | 100% |
| Kohinoor | 16.4 km | 0% | 100% |
| Duncan | 18.3 km | 0% | 100% |
| Macgillivray | 18.8 km | 0% | 100% |
| Vivonne Bay | 19.7 km | 0% | 100% |
| Cassini | 20.3 km | 0% | 100% |
| Birchmore | 22.3 km | 0% | 100% |
| Stokes Bay | 23.9 km | 0% | 100% |