Thornlands flood map & planning overlays
A planning-constraint profile of Thornlands (Redland City, QLD) - 21.95 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
21.95 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Thornlands'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.
Thornlands 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 7,526 Thornlands properties.
Lot-level readout
Flood-risk rating across all 7,526 properties
From LayeredGeo's lot-risk engine: council flood overlays, historical flooding and terrain, resolved to each individual lot in Thornlands.
Thornlands at a glance
How Thornlands is zoned
Selling in Thornlands? 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 21.95 km², Thornlands is highly constrained by planning overlays. About 21% of the suburb sits within a mapped flood overlay, and 50% is flagged bushfire-prone. There are 2 heritage-listed sites on record, and the dominant land-use zone is Low Density Residential. The terrain is largely flat, and the median lot measures about 658 m² across 7,823 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 Thornlands
Census 2021 figures published by the ABS for the Thornlands 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 1047, and decile 9 within Queensland. The national average is 1000.
Age profile
Share of Thornlands's 19,263 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Thornlands, the wider ABS statistical area containing Thornlands. There is no annual population series published at suburb level, so this describes the surrounding area rather than Thornlands itself.
7,544 in 2001 to 21,863 in 2025, up 190%.
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 Thornlands 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 →Thornlands planning - frequently asked
Where can I see a flood map of Thornlands?
The schematic on this page is a Thornlands flood map: the mapped flood overlays drawn over the suburb's terrain and street grid, covering about 21% of the suburb. Flood lines vary block to block, so for a specific property use the free interactive map - search any Thornlands address and it shows the flood, zoning and bushfire mapping on the exact lot boundary.
Is Thornlands flood-prone?
About 21% of Thornlands falls within a mapped flood overlay, against a Redland City average of 22%. Looking lot by lot, 8% of the 7,526 properties we analysed in Thornlands carry some level of mapped flood risk, including 50 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 Thornlands bushfire-prone?
Yes - around 50% of Thornlands is mapped as bushfire-prone, compared with a Redland City average of 41%. A bushfire-prone designation can trigger additional building requirements, so check the specific address.
What is the zoning in Thornlands?
The dominant planning zone in Thornlands is Low Density Residential, though the suburb also includes Rural and Recreation and Open Space. Zoning sets what you can build and do on a site, and can differ lot by lot.
Does Thornlands have heritage-listed places?
Thornlands has 2 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 Thornlands hilly or flat?
Thornlands is largely flat: the median lot slope is about 3%. Ground level runs from roughly 5 m to 64 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 Thornlands?
Across 7,823 surveyed parcels in Thornlands, the median lot size is about 658 m². There are also 748 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.
Does Thornlands have a train station?
There is no train station inside Thornlands itself. The suburb is served by 71 bus stops.
What is the population of Thornlands?
At the 2021 Census Thornlands had 19,263 usual residents, with a median age of 36 and an average household size of 2.9 people. The wider Thornlands statistical area, which contains Thornlands, went from 7,544 people in 2001 to 21,863 in 2025, up 190%. ABS publishes no annual population series for individual suburbs, so that trend describes the surrounding area rather than Thornlands alone.
Is Thornlands an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Thornlands scores 1047 and sits in decile 9 of 10 nationally and decile 9 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 Thornlands?
Median household income in Thornlands was $2,218 a week at the 2021 Census, against $1,488 for the typical suburb in Redland City. Median rent was $470 a week and the median mortgage repayment $2,167 a month. These are 2021 Census figures and have not been indexed to today.
Do I need a planning report for a Thornlands property?
A Thornlands 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.