Short answer: it depends on the zone ladder, not a single citywide rule. A dual occupancy (the report term for a duplex) sits on three different rungs in Brisbane, depending on the block's zone. Low density residential carries no dual occupancy row to assess it against, dropping the use to impact assessment. Low-medium density residential lists it as code assessable, but only inside a height and precinct test, one version of which adds a walking-distance test to a train or busway station. Character residential lists it as code assessable in exactly one precinct, only where an older house already on the site is kept. Each rung carries its own condition, and that condition, not the suburb, decides the answer for a specific block.
One thing holds across every zone: the Dual Occupancy Code (9.3.6) never grants a duplex accepted, no-application status on its own, since its application clause carries no accepted-development trigger. So wherever a dual occupancy is a live pathway, it is a development application, decided as code assessment (against the scheme's technical benchmarks) or impact assessment (with public notification). Which of the two you get is set entirely by the zone and precinct test below, read from Brisbane City Plan 2014's own tables of assessment.
The zone ladder: where a duplex is code assessable, and where it is not
| Zone | Category | Condition |
|---|---|---|
| Low density residential (LDR) | Impact assessment | Dual occupancy is not listed as a use in the zone's Table of Assessment (Table 5.5.1); a use not listed falls to the table's catch-all of impact assessment. |
| Low-medium density residential (LMR) | Code assessment | Where the design meets the precinct's height and storey cap, detailed below; above the cap, impact assessment. |
| Character residential | Code assessment, Infill housing precinct only | Where any house built in 1946 or earlier on the site is retained AND the new building stays within 2 storeys and 9.5 m; failing either condition, or sitting outside the Infill housing precinct, falls to the table's catch-all of impact assessment. |
The LDR result surprises owners who assume a residential zone means the use is available. Brisbane does not ban a duplex outright in LDR; the zone's Table of Assessment simply omits the use, and the scheme's default for a not-listed use is impact, not code. LMR and Character residential both carry a dual occupancy row, but each is conditional, and the two conditions are not the same shape, which the rest of this page works through.
The LMR precinct split: height, storeys and the 400 m station test
| LMR precinct | Height / storey cap for code assessment | Additional condition |
|---|---|---|
| Up to 3 storeys precinct | 3 storeys / 11.5 m | None beyond the height cap itself. |
| 2 storey mix precinct | 2 storeys / 9.5 m | None beyond the height cap itself. |
| 2 or 3 storey mix precinct | 3 storeys / 11.5 m | ONLY where the site has frontage to a road reserve of at least 15.5 m AND part of the site sits within 400 m walking distance of a rail or busway station access point; otherwise the precinct is capped at 2 storeys / 9.5 m. |
This split is Brisbane's own material, read from the LMR zone's Table of Assessment, and it rewards a careful read. The station test exists only inside the 2 or 3 storey mix precinct, and it is compound, not a single figure: the road reserve width and the walking-distance condition both have to be met for the extra storey; meeting only one leaves the precinct at 2 storeys / 9.5 m, the same ceiling that applies zone-wide in the 2 storey mix precinct. The Up to 3 storeys precinct gets the third storey with no station condition attached at all; its name is the whole test. Which precinct applies to a given block, and whether the 400 m walking distance actually clears from that block's own boundary, is a mapping question confirmed on Council's eplan, not assumed from the suburb.
Character residential: the retention condition, in full
The Character residential zone runs a narrower, differently shaped gate. Its Table of Assessment (Table 5.5.5) lists dual occupancy as code assessable only inside the Infill housing precinct, and only where two conditions both hold: any house on the site built in 1946 or earlier is retained, not demolished, and the new building keeps to 2 storeys and 9.5 m. How the retention condition reads on a site where the pre-1946 house is gone, or was never there, is a question the table's words do not settle in the abstract; a town planner confirms it for the specific site. What the table does settle: a design exceeding 2 storeys and 9.5 m fails the condition even with the house kept, and a site in the Character residential zone but outside the Infill housing precinct is not part of this pathway at all. Those cases fall to the table's catch-all: impact assessment, the same outcome as a not-listed use in LDR, reached here through a failed condition rather than an absent row.
Benchmarks are not eligibility gates: what the 600 m² and 800 m² figures actually do
This is where confusion happens, and where the zone ladder above needs one more layer read correctly. The 600 m² / 15 m frontage figure attached to every LMR precinct, and the 800 m² / 20 m frontage figure attached to the Character residential Infill housing precinct, do not come from either Table of Assessment above. They come from Table 9.3.6.3.B of the Dual Occupancy Code itself, a site-requirements-and-heights table the code applies once a proposal is already inside an assessment, code or impact, as one benchmark among several a design is tested against, not the test that decides whether the proposal reaches code assessment at all; that decision is made entirely by the height, storey and station conditions above. The code's own application clause carries no accepted-development trigger, so this table never grants an outright pass either; it sits alongside the code's boundary-setback table (9.3.6.3.C) and its acceptable outcomes for site cover, private open space and parking, benchmarks a code-assessable application is measured against. The code's own words on one neighbouring benchmark, site cover, show the same pattern (Dual Occupancy code 9.3.6.3, Acceptable outcome AO11, verified against the operative v36.00/2026 text):
"Development has a building footprint or site cover that complies with the requirements set out in: (a) a neighbourhood plan; or (b) if no neighbourhood plan applies or no requirements are specified in the neighbourhood plan, the maximum building footprint is 50%."
That is the level the 600 m² and 800 m² figures sit at: a benchmark inside an already-triggered code assessment, not a use-table condition that flips the category to impact if a site falls short. What happens on a site that clears the category test above but sits under the code's own minimum site area is a design question the code assessment process works through on its merits, confirmed by a town planner against the specific proposal, not something this page resolves in the abstract.
The titling step: selling one, keeping one
A dual occupancy in LandIntel's report terms always means the traditional duplex: two dwellings built to sell one and keep one. Whichever pathway applies, the land itself stays a single lot; a dual occupancy approval does not subdivide the ground under it. Each dwelling becomes separately saleable through a Building Format Plan, a form of community title layered over the approved building on that one lot, rather than a Standard Format Plan land subdivision creating new freehold lots. That titling step is its own process, confirmed with a solicitor or planner once the building is approved, and it runs independently of any subdivision density rule that might separately apply if the same site were instead split into freehold house lots.
What flood-mapped land changes
For a dual occupancy, flood mapping in Brisbane adds a benchmark layer; it does not hand back an accepted pathway. Under Table 5.10.11 (the Flood overlay's table of assessment, which routes to the Flood overlay code's benchmarks), the accepted rows operate only where the use is already accepted in the zone or neighbourhood plan, and a dual occupancy is not an accepted use in any of the zones this page discusses, so no accepted flood pathway exists for a duplex here. A new dual occupancy premises in a Brisbane River or Creek/waterway flood planning area is code assessment; in the Overland flow sub-category a dual occupancy is code assessment as well, that row exempting only a dwelling house or a park; and the table's own note keeps an impact-assessable proposal at impact. The practical effect is to add the Flood overlay code's benchmarks to whichever assessment the zone and precinct test above already produces; what that means for a specific design is confirmed against the mapped flood layer for that parcel, not assumed from the flood category alone.
How to check your own block
- Find your parcel on Brisbane's City Plan eplan and confirm both the zone and, if it is Low-medium density residential, the exact precinct name. That sets which row of the zone ladder above applies.
- If the zone is LMR and the precinct is the 2 or 3 storey mix precinct, check the road reserve width fronting the site and whether any part of the site sits within 400 m walking distance of a rail or busway station's public pedestrian access point.
- If the zone is Character residential, check whether the site sits in the Infill housing precinct and whether a house built in 1946 or earlier on the site would be retained as part of the design.
- Once the category is clear, check the Dual Occupancy Code's own site area, frontage, setback and site cover benchmarks against the specific design, and any overlay, including flood, that also applies to the parcel.
- Confirm the Building Format Plan titling step with a solicitor or planner once the design is set.
This page is general information about the Brisbane City Plan 2014, not advice about your property. Overlay effects vary lot by lot, planning schemes amend, and the council's current scheme prevails. Do not rely on this page for a specific property. Get a site-specific report or independent professional advice before acting. We work with town planners, not in place of them: where a pathway depends on design or professional judgement, a town planner or the relevant qualified professional confirms it for your specific proposal.
Want the answer for your block? Our $690 site-specific report reads the zone, the precinct, every overlay mapped on the property and the surviving development pathways for one property, with every figure cited to the scheme. Not ready for that? Start with the free development risk checklist, read our Brisbane planning and zoning guide, or see how the rules differ for a full block split in Can I Subdivide My Land in Brisbane? and for a single subordinate dwelling in Can I Build a Granny Flat in Brisbane?
Sources: Brisbane City Plan 2014 (the council's official eplan), including the Dual Occupancy code (9.3.6) and Tables 9.3.6.3.B and 9.3.6.3.C, the Low density residential zone Table of Assessment (Table 5.5.1), the Low-medium density residential zone Table of Assessment (Table 5.5.2), the Character residential zone Table of Assessment (Table 5.5.5), and Table 5.10.11 (the Flood overlay's table of assessment, which routes to the Flood overlay code's benchmarks), plus Brisbane City Council's dual occupancy guidance page. Everything on this page comes from the council's own published planning scheme; we explain it in plain English. The scheme text itself is the authority.
Published by LandIntel. How we research: our methodology.
Verified 3 to 10 July 2026 against Brisbane City Plan 2014, version 36.00/2026 (effective 12 June 2026); schemes amend, and the live scheme prevails.