Mount Crosby flood map & planning overlays
A planning-constraint profile of Mount Crosby (Brisbane City, QLD) - 15.28 km², mapped from live council and state overlay data. This suburb is highly constrained.
Everything below is suburb-wide. Overlays change block to block - see which ones actually touch your lot. The map is free.
Constraint readout
15.28 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Mount Crosby's boundary, with the flood, bushfire and environmental overlays drawn on top. It shows where constraints fall; the interactive map shows them on your exact address.
Mount Crosby flood risk at the property level
Overlay percentages say how much land is constrained; these figures say how many properties are actually touched, from our lot-by-lot analysis of 778 Mount Crosby properties.
Lot-level readout
Flood-risk rating across all 778 properties
From LayeredGeo's lot-risk engine: council flood overlays, historical flooding and terrain, resolved to each individual lot in Mount Crosby.
Mount Crosby at a glance
How Mount Crosby is zoned
Selling in Mount Crosby? 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 15.28 km², Mount Crosby is highly constrained by planning overlays. About 32% of the suburb sits within a mapped flood overlay, and 92% is flagged bushfire-prone. There are 18 heritage-listed sites on record, and the dominant land-use zone is Special purpose (Utility services). The terrain is hilly, and the median lot measures about 5,137 m² across 723 parcels. These figures are suburb-wide - the overlays that actually apply to a given lot can differ block to block, which is what a property-level check tells you.
Who lives in Mount Crosby
Census 2021 figures published by the ABS for the Mount Crosby 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 1109, and decile 10 within Queensland. The national average is 1000.
Age profile
Share of Mount Crosby's 1,860 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Karana Downs, the wider ABS statistical area containing Mount Crosby. There is no annual population series published at suburb level, so this describes the surrounding area rather than Mount Crosby itself.
5,096 in 2001 to 6,261 in 2025, up 23%.
Source: Australian Bureau of Statistics. Census of Population and Housing 2021 (General Community Profile) and SEIFA 2021, both published at the Suburbs and Localities level; Regional Population (estimated resident population) at Statistical Area Level 2. Used under CC BY 4.0. Census counts of small populations are randomly adjusted by the ABS to protect confidentiality, so figures for small suburbs are indicative.
Check a specific Mount Crosby 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 →Mount Crosby planning - frequently asked
Where can I see a flood map of Mount Crosby?
The schematic on this page is a Mount Crosby flood map: the mapped flood overlays drawn over the suburb's terrain and street grid, covering about 32% of the suburb. Flood lines vary block to block, so for a specific property use the free interactive map - search any Mount Crosby address and it shows the flood, zoning and bushfire mapping on the exact lot boundary.
Is Mount Crosby flood-prone?
About 32% of Mount Crosby falls within a mapped flood overlay, against a Brisbane City average of 40%. Looking lot by lot, 9% of the 778 properties we analysed in Mount Crosby carry some level of mapped flood risk, including 25 rated high risk or historically affected. Flood overlays vary block to block, so whether a particular lot is affected needs a property-level check.
Is Mount Crosby bushfire-prone?
Yes - around 92% of Mount Crosby is mapped as bushfire-prone, compared with a Brisbane City average of 27%. A bushfire-prone designation can trigger additional building requirements, so check the specific address.
What is the zoning in Mount Crosby?
The dominant planning zone in Mount Crosby is Special purpose (Utility services), though the suburb also includes Rural residential and Conservation (Local). Zoning sets what you can build and do on a site, and can differ lot by lot.
Does Mount Crosby have heritage-listed places?
Mount Crosby has 18 heritage-listed places on record. Heritage listing affects what you can alter or demolish, so confirm whether a specific property is listed or near a heritage place.
Is Mount Crosby hilly or flat?
Mount Crosby is hilly: the median lot slope is about 18%, and 65% of properties sit on slopes of 15% or steeper. Ground level runs from roughly 30 m to 107 m AHD across the suburb. Slope drives site costs - cut and fill, retaining walls and driveway grades - so it is worth knowing before you commit to a sloping block.
What is the typical lot size in Mount Crosby?
Across 723 surveyed parcels in Mount Crosby, the median lot size is about 5,137 m². There are also 246 registered easements mapped in the suburb - an easement can restrict where you can build, so always check the title and overlays for the specific lot.
What is the population of Mount Crosby?
At the 2021 Census Mount Crosby had 1,860 usual residents, with a median age of 42 and an average household size of 3.1 people. The wider Karana Downs statistical area, which contains Mount Crosby, went from 5,096 people in 2001 to 6,261 in 2025, up 23%. ABS publishes no annual population series for individual suburbs, so that trend describes the surrounding area rather than Mount Crosby alone.
Is Mount Crosby an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Mount Crosby scores 1109 and sits in decile 10 of 10 nationally and decile 10 within Queensland - decile 1 being the most disadvantaged tenth of Australian suburbs and decile 10 the least. The national average score is 1000. SEIFA summarises income, education, occupation and housing across the whole suburb, so it describes the area, not any particular household in it.
What is the median household income in Mount Crosby?
Median household income in Mount Crosby was $2,993 a week at the 2021 Census, against $2,122 for the typical suburb in Brisbane City. Median rent was $478 a week and the median mortgage repayment $2,095 a month. These are 2021 Census figures and have not been indexed to today.
Do I need a planning report for a Mount Crosby property?
A Mount Crosby planning report pulls every overlay - zoning, flood, bushfire, heritage and environmental - that touches a single lot, on live council and state data. The interactive map preview is free; a full PDF report is $9.