Birnam flood map & planning overlays
The Toowoomba Birnam rents for $460 a week, 3rd in the region.
Things you won't regret: spending $9 to know the lot before you commit.
Free map preview, then PDF reports from $9 - about the price of an iced latte on a public holiday.
A planning-constraint profile of Birnam
(Toowoomba Regional, QLD) - 3.87 km², mapped from live council and
state overlay data. This suburb is highly constrained.
Profile updated 7 November 2026.
Constraint readout
3.87 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Birnam'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
How common is mapped flood risk across Birnam properties?
Counts of properties, not share of land, across 43 analysed Birnam properties; no individual property result is identified.
Lot-level readout
Flood-risk rating across all 43 properties
From LayeredGeo's lot-risk engine: council flood overlays, historical flooding and terrain, resolved to each individual lot in Birnam.
Aircraft noise and flight paths over Birnam
The ANEF contour is a published planning forecast and observed overflight is what a sampled tracking feed recorded - neither describes any individual property.
Observed overflight - sampled 4 Sep to 7 Nov 2026
typical observed square 1 a day
Night movements: observed, lowest 3,000 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.
How this is measured
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.
Birnam at a glance
Schools in and near Birnam
Public school-location data shows availability across the suburb; it does not rate schools or assign any individual address to a catchment.
Inside the suburb boundary
0 schools providing primary years and 0 providing secondary years. A combined school may be counted in both teaching levels.
Nearest school availability
Primary: 1.11 km from the suburb boundary
Secondary: 1.11 km from the suburb boundary
Source: Queensland Government school geographic information. Catchment boundaries can divide a suburb and change over time.
Which school zone is a Birnam address in? Check an address with our free school zone checker.
How Birnam is zoned
Selling in Birnam? The lot-level zone is the zoning Part 3 of Queensland's Form 2 seller disclosure statement asks for - see our Form 2 planning data guide.
Across its 3.87 km², Birnam is highly constrained by planning overlays. About 24% of the suburb sits within a mapped flood overlay, and 50% is flagged bushfire-prone. The dominant land-use zone is Rural. The terrain is gently undulating, and the median lot measures about 99,749 m² across 37 parcels.
Who lives in Birnam
Census 2021 figures published by the ABS for the Birnam 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 1041, and decile 9 within Queensland. The national average is 1000.
Age profile
Share of Birnam's 63 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Highfields, the wider ABS statistical area containing Birnam. There is no annual population series published at suburb level, so this describes the surrounding area rather than Birnam itself.
6,433 in 2001 to 16,630 in 2025, up 159%.
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.
Birnam 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 relevant council planning scheme and Queensland Government spatial data |
| Bushfire-prone mapping | Mapped | the relevant council planning scheme and Queensland Government spatial data |
| Zoning | Mapped | the relevant council planning scheme and Queensland Government spatial data |
| Heritage and environment | Mapped where published | the relevant council planning scheme and Queensland Government spatial data |
| Aircraft noise contours (ANEF) | Not held | the relevant council planning scheme and Queensland Government spatial data, Defence |
| Observed flight paths | Observed | adsb.lol, under the Open Database License |
| Demographics | Available | Australian Bureau of Statistics (2021 Census and SEIFA) |
| School availability | Available | Queensland Government |
Profile last materially updated 7 November 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 Birnam 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.
See what's in the $9 report →Aircraft have been seen below 3,000 ft over about 45% of Birnam. 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 Birnam. The free check tells you whether one reaches an address; where it does, a Flood Model Report is +$9 with the planning report.
The Terrain Report shows the fall of the block - contours, cross sections and a 3D model of the lot to spin round in your browser (+$9 with the planning report).
Building or pricing a slab? The $119 geotechnical desktop report covers geology, soils, bores and the indicative soil reactivity range to expect for a Birnam lot.
Birnam planning - frequently asked
Is Birnam flood-prone?
About 24% of Birnam falls within a mapped flood overlay, against the council-wide suburb average of 27%. Across the suburb, 5% of the 43 properties we analysed carry some level of mapped flood risk, including 2 rated high risk or historically affected. Published flood models are held over parts of Birnam; the free check on the Flood Model Report page says whether one reaches a given address.
Is Birnam bushfire-prone?
Around 50% of Birnam is mapped as bushfire-prone, compared with a Toowoomba Regional average of 36%.
Is Birnam under a flight path?
Aircraft were observed below 3,000 ft over about 45% of Birnam, and over about 93% at any altitude up to 10,000 ft, in the period sampled (4 Sep 2026 to 7 Nov 2026). The lowest measured aircraft was at 1,500 ft, with an average of 4,000 ft. At the busiest point in the suburb about 4 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 Birnam?
The dominant planning zone in Birnam is Rural, though the suburb also includes Community Facilities and Unzoned.
Does Birnam have heritage-listed places?
No heritage-listed places are on record within Birnam.
Is Birnam hilly or flat?
Birnam is gently undulating: the median ground slope is about 8%, and 19% of measured points sit on grades of 15% or steeper. Ground level runs from roughly 500 m to 615 m AHD across the suburb.
What is the typical lot size in Birnam?
Across 37 surveyed parcels in Birnam, the median lot size is about 99,749 m². There are also 1 registered easements mapped in the suburb.
What is the population of Birnam?
At the 2021 Census Birnam had 63 usual residents, with a median age of 43 and an average household size of 3.3 people. The wider Highfields statistical area, which contains Birnam, went from 6,433 people in 2001 to 16,630 in 2025, up 159%.
Is Birnam an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Birnam scores 1041 and sits in decile 8 of 10 nationally and decile 9 within Queensland (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Birnam?
Median household income in Birnam was $2,374 a week at the 2021 Census, against $1,583 for the typical suburb in Toowoomba Regional. Median rent was $460 a week and the median mortgage repayment $2,537 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Cranley | 2.1 km | 10% | 44% |
| Blue Mountain Heights | 3.0 km | <1% | 60% |
| Mount Kynoch | 3.1 km | 4% | 83% |
| Highfields | 3.7 km | 10% | 50% |
| Gowrie Junction | 4.2 km | 22% | 23% |
| Cawdor | 4.3 km | 14% | 48% |
| Wilsonton Heights | 4.4 km | 4% | 0% |
| Cotswold Hills | 4.4 km | 11% | 24% |
| Woolmer | 4.7 km | 16% | 38% |
| Rockville | 5.0 km | 3% | 2% |