Short answer: sometimes, and which precinct your block sits in decides it more than anything else. Logan's scheme calls the traditional, separately saleable second dwelling a "Dual occupancy", kept deliberately distinct from the "Dual occupancy (auxiliary unit)", the granny flat product. The full duplex has an accepted, no application pathway in the Low density residential (LDR) zone, but only in three of its six precincts, and only above a minimum lot size that differs precinct by precinct.
The LDR zone has six precincts. Only three carry an accepted duplex pathway
Logan's LDR zone code (6.2.5) sets out six precincts: Acreage, Large suburban, Small acreage, Small lot, Suburban and Village (Table 6.2.5.3.4, verified 7 July 2026). Only three list a full, non-auxiliary Dual occupancy as an accepted use at all: Small lot, Suburban and Village. In those three, a duplex is accepted development (subject to requirements) once the lot reaches the precinct's minimum: 525 m² in Small lot, 700 m² in Suburban, 875 m² in Village (Table 5.5.5.1 and Table 6.2.5.3.4, verified 3 and 7 July 2026).
The other three, Acreage, Large suburban and Small acreage, are a different story. Their own land use lists name the Dual occupancy (auxiliary unit) as an as of right use, but not a full Dual occupancy at any size. What assessment category a full duplex would even fall under there is not stated in the facts read for this page, and needs checking directly against the precinct's own zone code entry rather than assumed.
Clearing the lot minimum is the start, not the finish
The three qualifying precincts each carry their own density cap and site cover figure on top of the lot minimum (Table 6.2.5.3.4 and Table 6.2.5.3.1, verified 7 July 2026):
| Precinct | Minimum lot | Max density (dual occupancy) | Max site cover |
|---|---|---|---|
| Small lot | 525 m² | 38 dwellings per hectare | 60% |
| Suburban | 700 m² | 28 dwellings per hectare | 50% |
| Village | 875 m² | 22 dwellings per hectare | 50% |
Building height is set by slope, not precinct: up to 8.5 m under 15% slope, up to 10 m at 15% or more (Table 6.2.5.3.1 AO2, verified 3 July 2026). Boundary clearance diverges from a plain zone-code reading: the zone's setback table (6.2.5.3.3) covers "any other use", but a Dual occupancy's clearances instead run through the 9.3.2 code via the Queensland Development Code, MP1.1 to 1.3, confirmed at point of use. Parking is a flat 2 spaces per dwelling, 1 covered, regardless of precinct (Part 9.4.7, verified 3 July 2026). None of this is a finish line: these are nominated acceptable outcomes, one way through rather than the only way, and a performance argument on any one stays open in principle even though missing one in practice triggers the cascade below.
Below the minimum, the record leaves the next step open
Both typed records behind the 525/700/875 m² test stop short of naming what happens under it. One notes the effect only as a drop to code or impact assessment; the other, reading the same table, records that below the precinct minimum the next tier is read at the point of use, not stated as a fixed answer. Neither resolves whether a sub-minimum duplex lands in code assessment or jumps to impact assessment with public notification. That gap sits in how Table 5.5.5.1 itself treats the specific precinct and lot below its minimum, and it is read there, not assumed.
Two of Logan's ten local plans complicate this further. Loganholme accepts (subject to requirements) a non-auxiliary duplex on a corner lot in Residential choice or Residential frame, or on a lot of 800 m² or more in Suburban residential; where it is not accepted and sits in the Residential choice or Residential frame precinct it is code assessable, and in Loganholme's other precincts the zone table governs (Table 5.9.6.1, verified 7 July 2026). Loganlea's table states an accepted pathway only for the auxiliary unit in Residential edge and Residential frame, names no accepted condition for a full duplex anywhere, and is silent on Residential core, Low-medium and Mixed use (Table 5.9.7.1, verified 7 July 2026). A local plan's table overrides the zone's, so checking whether the parcel sits inside either comes first. Outside the LDR zone, the Low-medium density residential zone runs its own ladder (a townhouse-form product accepted from 500 m² in its Townhouse precinct, code assessable in the Apartment precinct), covered alongside the granny flat rules in our Logan granny flat article.
The overlays, read specifically for the full duplex
Every overlay here sits on Logan's public mapping for anyone to read; the work is in what each one means for this use, not the auxiliary unit's version of it. Logan's own architecture explains why the overlay layer is checked on its own terms rather than assumed to follow the zone (Logan Planning Scheme 2015, 5.3 Categories of development and assessment, verified 7 July 2026):
"a category of development or assessment in a local plan overrides a category of development or assessment in a zone and a category of development or assessment in an overlay overrides a category of development or assessment in a zone or local plan."
Bushfire hazard (8.2.3) and landslide hazard and steep slope area (8.2.8) both carry a live assessment benchmark code. Their tables exempt a use from that code's effect only where the use is a "Dual occupancy (auxiliary unit)" or "Dwelling house" by name (Tables 5.10.3.1 and 5.10.8.1, verified 7 July 2026). A full Dual occupancy is not a named use, so on mapped bushfire or landslide land, both codes become live benchmarks for a duplex where they would not for a granny flat on the same block. Bushfire's acceptable outcomes look for a bushfire attack level of 29 or lower and asset protection zones on the lot at a slope under 18 degrees; landslide's looks for a geotechnical report certifying a factor of safety greater than 1.5.
Flood is less settled. Table 5.10.5.1's dwelling specific rows, keyed to flood tier, are also written for "Dual occupancy (auxiliary unit)" and "Dwelling house" by name. A full Dual occupancy is not on that list, so it falls instead under the table's rows for every other use, which key off whether the use counts as assessable development in the zone or local plan rather than the flood tier directly, a distinction the table does not spell out here. Read the flood row for the parcel before assuming the auxiliary unit's treatment carries across.
Titling: a Dual occupancy stays one lot, sold two ways
An approved duplex is not two separate blocks of land. The land stays one lot; each dwelling becomes separately saleable through a Building Format Plan (community title) over the approved building, its own process led by a solicitor or planner. This differs from reconfiguring a lot: the 525/700/875 m² figures gate whether the duplex use is accepted, coded or routed to the next tier, not a subdivision density limit, and the land density caps governing a freehold lot split do not apply again at the title step. Confirming the titling mechanics for a specific building is a step for the professionals.
How to check your own block
- Find your parcel on Logan's ePlan and confirm the zone and precinct. Only Small lot, Suburban and Village carry an accepted duplex pathway; the other three do not list the full duplex as an accepted use at any size.
- Check the lot against its precinct's minimum, density cap and site cover figure, and confirm boundary clearances through the 9.3.2 code and QDC MP1.1 to 1.3, not the zone's general setback table.
- Under the minimum, do not assume the next tier; read Table 5.5.5.1, or the Loganholme or Loganlea local plan table if mapped inside either.
- Read the bushfire, landslide and flood overlay maps, and check whether each table names the full duplex or only the auxiliary unit and dwelling house.
This page is general information about the Logan planning scheme, 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 Logan planning and zoning guide, see whether a subdivision is a better fit, or check whether a granny flat clears the block where a duplex does not.
Sources: Logan Planning Scheme 2015 (the council's official ePlan), including the Low density residential zone code (6.2.5), the Dual occupancy and Dwelling house code (9.3.2), Table 5.5.5.1 (Table of Assessment), the Loganholme and Loganlea local plan tables (5.9.6 and 5.9.7), and the overlay tables cited above (Part 5.10). 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 7 July 2026 against Logan Planning Scheme 2015, Version 9.2 (with TLPI No.1/2024), effective 1 July 2025, Status Current; schemes amend, and the live scheme prevails.