Brisbane · Duplex guide
Building a duplex in Brisbane: rules, approval and what the data shows
Brisbane City Plan 2014 (v36) sets the rules for a duplex or dual-occupancy project in Brisbane. The figures on this page come from 173 decided dual-occupancy and duplex applications recorded against Brisbane council, current to 9 Sept 2026.
According to Casa Intelligence analysis of 173 decided dual-occupancy and duplex applications in Brisbane, 98% were approved, with a median decision time of 113 days.
98%
Approval rate
169 of 173 decided Brisbane applications
113 days
Median decision time
Lodgement to decision across 173 dated Brisbane cases
173
Decided applications
Brisbane dual-occupancy and duplex applications
20
Zones tracked
Brisbane duplex and dual-occupancy zone rows citing Brisbane City Plan 2014 (v36)
Do you need council approval for a duplex or dual-occupancy project in Brisbane?
Whether a duplex or dual-occupancy project in Brisbane needs a development application is decided by Brisbane City Plan 2014 (v36), which places each proposal in one of the three Planning Act 2016 categories: accepted development, code assessable or impact assessable. For a Brisbane lot the answer turns on the zone, any precinct mapped over it and the overlays that apply, so Brisbane council does not publish one blanket answer for duplex and dual-occupancy proposals.
Casa's rules register for Brisbane City Plan 2014 (v36) records dual occupancy as a contemplated use in 10 of the 20 Brisbane zones it tracks, code assessable in District Centre, Emerging Community, High Density Residential, Low-Medium Density Residential, Medium Density Residential and 3 other zones and impact assessable in Character Residential and Low Density Residential. In the 10 remaining Brisbane zones a dual occupancy is not an anticipated use, which in practice means impact assessment or an unlikely approval.
Minimum lot sizes and frontages for a Brisbane dual occupancy are set per zone and often per precinct, and the register figures for those minimums have not yet been checked against the scheme text, so this page quotes Brisbane's own wording below rather than printing an unchecked number.
The Brisbane record gives a feel for what assessment involves: a quarter of the 173 dated duplex and dual-occupancy decisions were made within 63 days of lodgement, and a quarter took longer than 163 days.
The zone, precinct and overlay position of one Brisbane address is what settles the pathway for a duplex or dual-occupancy project, and a free Casa block check reads all three for any Brisbane lot in seconds.
What Brisbane’s scheme says about duplex and dual-occupancy development
The passage below is quoted word for word from Brisbane City Plan 2014 (v36), the instrument Brisbane council assesses duplex and dual-occupancy proposals against, from the Dual occupancy code, as Casa held the Brisbane scheme text on 9 Sept 2026.
“The purpose of the Dual occupancy code is to assess the suitability of development to which this code applies.”
Source for these Brisbane duplex and dual-occupancy passages: Brisbane City Plan 2014 (v36) (Brisbane council)
Duplex position by zone in Brisbane
Casa's register holds 20 Brisbane zone rows relevant to a duplex or dual-occupancy project, each citing Brisbane City Plan 2014 (v36), and precinct mapping and overlays tighten these duplex and dual-occupancy positions for individual Brisbane lots.
| Zone | Dual occupancy | Assessment |
|---|---|---|
| Character Residential | Yes | Impact assessable |
| District Centre | Yes | Code assessable |
| Emerging Community | Yes | Code assessable |
| High Density Residential | Yes | Code assessable |
| Low Density Residential | Yes | Impact assessable |
| Low-Medium Density Residential | Yes | Code assessable |
| Medium Density Residential | Yes | Code assessable |
| Mixed Use | Yes | Code assessable |
| Principal Centre | Yes | Code assessable |
| Priority Development Area | Yes | Code assessable |
| Community Facilities | No | not held |
| Conservation | No | not held |
| Environmental Management | No | not held |
| Industry | No | not held |
| Low Impact Industry | No | not held |
| Open Space | No | not held |
| Rural Residential | No | not held |
| Rural | No | not held |
| Special Purpose | No | not held |
| Sport and Recreation | No | not held |
"not held" means Brisbane's register has no value for that duplex and dual-occupancy cell, not that the scheme is silent. Height, setback and site-cover figures for Brisbane zones are held in the register but have not been checked against the scheme text, so they are not printed on this duplex and dual-occupancy page.
How duplex and dual-occupancy applications have fared in Brisbane
Brisbane council has decided 173 dual-occupancy and duplex applications in our dataset, approving 169 (98%) and refusing 4. That is 1 point below the pooled South East Queensland figure of 99% across 3,382 decided duplex and dual-occupancy applications in the 7 councils Casa tracks, ranking Brisbane 6th of 6 for approval rate.
Duplex work is under 1% of everything Brisbane council has decided in our records (144,775 applications of all kinds), which makes Brisbane the 5th largest duplex and dual-occupancy cohort of the 7 councils.
The median Brisbane decision took 113 days from lodgement, measured across the 173 duplex and dual-occupancy applications with both dates recorded, 47 days slower than the 66-day middle council for this cohort. Brisbane decisions made since the start of 2024 ran at a median of 111 days (29 cases), 2 days shorter than the long-run Brisbane figure.
The busiest year for duplex and dual-occupancy decisions in Brisbane was 2017, with 21 decided. In 2025 Brisbane council decided 15 and approved 100%, against 8 decided in 2024.
By suburb, Brisbane's duplex and dual-occupancy decisions cluster in New Farm (11 decided, 91% approved) and Red Hill (8 decided, 100% approved).
Brisbane duplex and dual-occupancy decisions by year
| Year | Decided | Approved | Refused | Approval rate |
|---|---|---|---|---|
| 2021 | 15 | 15 | 0 | 100% |
| 2022 | 8 | 7 | 1 | 88% |
| 2023 | 13 | 13 | 0 | 100% |
| 2024 | 8 | 8 | 0 | 100% |
| 2025 | 15 | 15 | 0 | 100% |
| 2026 | 6 | 6 | 0 | 100% |
Recent duplex and dual-occupancy decisions in Brisbane
The 5 most recently decided dual-occupancy and duplex applications recorded against Brisbane council, each cited by Brisbane's own application number so it can be looked up on the council's register.
| Application | Decision | Decided | Days to decision |
|---|---|---|---|
| A006935023 | Approved | 20 May 2026 | 133 days |
| A006880959 | Approved | 14 May 2026 | 210 days |
| A006903514 | Approved | 10 Apr 2026 | 142 days |
| A006871029 | Approved | 8 Apr 2026 | 190 days |
| A006982807 | Approved | 19 Mar 2026 | 0 days |
Duplex in Brisbane: common questions
Do I need council approval for a duplex or dual-occupancy project in Brisbane?
Only your lot's zone, precinct and overlays under Brisbane City Plan 2014 (v36) can answer that for a duplex or dual-occupancy project at a Brisbane address. Some compliant Brisbane proposals of this type proceed on building approval alone, while others need a full development application. Brisbane council has decided 173 dual-occupancy and duplex applications in our records, so the pathway question comes up regularly in Brisbane.
Which zones allow duplex and dual-occupancy development in Brisbane?
Casa's register for Brisbane City Plan 2014 (v36) records duplex and dual-occupancy development as contemplated in Character Residential, District Centre, Emerging Community, High Density Residential, Low Density Residential, Low-Medium Density Residential and 4 other zones, 10 of the 20 Brisbane zones tracked. Precinct mapping and overlays can still restrict a Brisbane lot inside one of those zones.
What is the approval rate for duplex or dual-occupancy project applications in Brisbane?
98% of the 173 decided dual-occupancy and duplex applications recorded against Brisbane council were approved and 4 were refused. Brisbane sits against a pooled duplex and dual-occupancy figure of 99% across the 7 South East Queensland councils Casa tracks. These are past Brisbane decisions and they do not guarantee any future duplex and dual-occupancy outcome.
How long does duplex or dual-occupancy project approval take in Brisbane?
The median time from lodgement to decision across the 173 dated duplex and dual-occupancy applications in Brisbane was 113 days. A quarter of Brisbane decisions came within 63 days and a quarter took longer than 163 days. Since the start of 2024 the Brisbane median has been 111 days across 29 decisions.
What does Brisbane City Plan 2014 (v36) say about duplex and dual-occupancy development in Brisbane?
The Dual occupancy code (section 9.3.6.2) states: "The purpose of the Dual occupancy code is to assess the suitability of development to which this code applies."
About this guide
The zone rows on this page come from Casa's rules register for Brisbane City Plan 2014 (v36), and the statistics from 173 decided dual-occupancy and duplex applications recorded against Brisbane council between 22 Sept 2014 and 20 May 2026, computed on 9 Sept 2026.
Brisbane amends its scheme over time, and precincts, local plans and overlays can vary these duplex and dual-occupancy rules for a single Brisbane lot. Past Brisbane decisions describe how comparable duplex and dual-occupancy proposals fared and do not predict any future application.
This page is general information, not planning or legal advice.
Would a Brisbane block support a duplex or dual-occupancy project? Check the address free.
Brisbane-wide duplex and dual-occupancy rules give the frame, and a free block check reads the zone, precinct and overlays for one Brisbane address and returns a Casa Score for a duplex or dual-occupancy project in seconds.
What the Brisbane duplex rules mean for your site
This guide covers Brisbane at council level across 173 decided dual-occupancy and duplex applications. A Preliminary Planning Report covers one address: the likely pathway for a duplex or dual-occupancy project, the constraints on that Brisbane lot, and the comparable Brisbane approvals, prepared by our planning team and delivered within three business days.