Underwood flood map & planning overlays
A planning-constraint profile of Underwood (Logan City, QLD) - 4.2 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
4.2 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Underwood'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.
Underwood 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 3,665 Underwood properties.
Lot-level readout
Flood-risk rating across all 3,665 properties
From LayeredGeo's lot-risk engine: council flood overlays, historical flooding and terrain, resolved to each individual lot in Underwood.
Underwood at a glance
How Underwood is zoned
Selling in Underwood? 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 4.2 km², Underwood is highly constrained by planning overlays. About 33% of the suburb sits within a mapped flood overlay, and 9% is flagged bushfire-prone. The dominant land-use zone is Low Density Residential. The terrain is gently undulating, and the median lot measures about 609 m² across 3,197 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 Underwood
Census 2021 figures published by the ABS for the Underwood 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 1023, and decile 9 within Queensland. The national average is 1000.
Age profile
Share of Underwood's 6,809 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Underwood, the wider ABS statistical area containing Underwood. There is no annual population series published at suburb level, so this describes the surrounding area rather than Underwood itself.
3,216 in 2001 to 7,527 in 2025, up 134%.
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 Underwood 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 →Underwood planning - frequently asked
Where can I see a flood map of Underwood?
The schematic on this page is a Underwood flood map: the mapped flood overlays drawn over the suburb's terrain and street grid, covering about 33% of the suburb. Flood lines vary block to block, so for a specific property use the free interactive map - search any Underwood address and it shows the flood, zoning and bushfire mapping on the exact lot boundary.
Is Underwood flood-prone?
About 33% of Underwood falls within a mapped flood overlay, against a Logan City average of 51%. Looking lot by lot, 15% of the 3,665 properties we analysed in Underwood carry some level of mapped flood risk, including 220 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 Underwood bushfire-prone?
Yes - around 9% of Underwood is mapped as bushfire-prone, compared with a Logan City average of 54%. A bushfire-prone designation can trigger additional building requirements, so check the specific address.
What is the zoning in Underwood?
The dominant planning zone in Underwood is Low Density Residential, though the suburb also includes Mixed Use and Recreation and Open Space. Zoning sets what you can build and do on a site, and can differ lot by lot.
Does Underwood have heritage-listed places?
No heritage-listed places are on record within Underwood. Even so, it is worth confirming for an individual property before any works.
Is Underwood hilly or flat?
Underwood is gently undulating: the median lot slope is about 5%, and 4% of properties sit on slopes of 15% or steeper. Ground level runs from roughly 19 m to 67 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 Underwood?
Across 3,197 surveyed parcels in Underwood, the median lot size is about 609 m². There are also 423 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 Underwood have a train station?
There is no train station inside Underwood itself. The suburb is served by 19 bus stops.
What is the population of Underwood?
At the 2021 Census Underwood had 6,809 usual residents, with a median age of 34 and an average household size of 3.1 people. The wider Underwood statistical area, which contains Underwood, went from 3,216 people in 2001 to 7,527 in 2025, up 134%. ABS publishes no annual population series for individual suburbs, so that trend describes the surrounding area rather than Underwood alone.
Is Underwood an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Underwood scores 1023 and sits in decile 8 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 Underwood?
Median household income in Underwood was $1,992 a week at the 2021 Census, against $1,924 for the typical suburb in Logan City. Median rent was $400 a week and the median mortgage repayment $1,950 a month. These are 2021 Census figures and have not been indexed to today.
Do I need a planning report for a Underwood property?
A Underwood 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.