# Duplexes and dual occupancies in Queensland: an investor's guide

What a dual occupancy is in Queensland planning law, how it differs from a granny flat, what councils approve, how the two homes are titled, and the tax points to check.

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Two homes on one block means two rents from one parcel of land. In Queensland the idea has a precise legal name, dual occupancy, and the name matters. It decides whether a council approval is needed, whether the two homes can ever be sold apart, how water is billed and how land tax treats the land.

A builder's floor plan or a listing may describe a home as a "duplex" or "dual living". Those words are sales language. The planning system only knows a handful of defined uses, and a home that looks like a duplex can be lawfully something else, or unlawfully nothing at all.

This guide follows the questions in the order an investor meets them: what the law calls a dual occupancy, how it differs from a secondary dwelling, what Brisbane and the Gold Coast require before building, how the finished pair can be titled, what a two-lot body corporate looks like, how utilities and tenancies are separated, and the land tax and depreciation points worth raising with an adviser. It describes the general rules; the answer for any one block depends on its zone, its overlays and its council.

## What the law calls a dual occupancy

Queensland's planning terms come from the Planning Regulation 2017, which sets standard definitions that councils use in their planning schemes. As quoted by Redland City Council, Schedule 24 of the regulation defines a dual occupancy as a residential use of premises involving two dwellings, attached or detached, on a single lot, or two dwellings on separate lots that share common property. The definition also covers the domestic outbuildings that go with them.

Two parts of that wording deserve attention. First, "attached or detached" means a dual occupancy does not have to look like a classic side-by-side duplex. Two freestanding houses on one lot can be a dual occupancy. Second, the definition reaches past the single lot: two dwellings on their own lots that share common property, such as a shared driveway in a small community titles scheme, still count. A duplex that is later given two titles around shared common property remains a dual occupancy.

Brisbane City Council uses the same definition in Brisbane City Plan 2014 and says plainly that dual occupancy is the term the plan uses for duplex developments.

The definition also has an exclusion. It does not include a residential use of premises that involves a secondary dwelling. That exclusion is where most of the confusion starts.

## Dual occupancy or secondary dwelling

A secondary dwelling is what most people call a granny flat. The Planning Regulation was amended in September 2022, and the law firm HopgoodGanim reported that the change was made on 26 September 2022. Since then a secondary dwelling has been defined as a dwelling on a lot that is used in conjunction with, but subordinate to, another dwelling on the lot, whether or not it is attached and whether or not its occupants are related to or associated with the household in the main home.

The same amendment removed the words "for 2 households" from the dual occupancy definition. The practical result, as Redland City Council puts it, is that the State removed restrictions on who can live in a secondary dwelling. Since 2022 a granny flat can be let to a tenant who has no connection with the main household. What still separates the two uses is not who lives there but how the two homes relate to each other: one subordinate and used with the other, or two equal homes.

The difference has lasting consequences. Fraser Coast Regional Council's information sheet on the two uses sets them out side by side.

<figure class="fig"><figcaption><b>Dual occupancy and secondary dwelling compared</b><span>As described by Fraser Coast Regional Council</span></figcaption>
<div class="scroll"><table class="tbl">
<thead><tr><th>Question</th><th>Dual occupancy</th><th>Secondary dwelling</th></tr></thead>
<tbody>
<tr><td>Size</td><td>No limit on either dwelling</td><td>Up to 70 square metres gross floor area to remain accepted development in residential zones</td></tr>
<tr><td>Separate title</td><td class="yes">Can be subdivided and sold separately</td><td>Cannot be subdivided, community titled or sold separately</td></tr>
<tr><td>Infrastructure charges</td><td>Charged on two dwelling units</td><td>None</td></tr>
<tr><td>Water and services</td><td class="yes">Separate connections or sub-metering allowed</td><td>One water meter, one utility bill, linked to the main house</td></tr>
</tbody>
</table></div>
<p class="src">Fraser Coast Regional Council, information sheet on dual occupancy or secondary dwelling. Size limits and charges differ between councils.</p></figure>

The figures in that table belong to one council's planning scheme. Redland City Council, for example, says its own secondary dwellings attract an infrastructure charge once they exceed the floor area thresholds set in its Amenity and Aesthetics Guideline, and that a secondary dwelling there "cannot be separately sold". The principle is the same across the State; the numbers are local. Granny flats as such, with what can be built and charged, are a subject of their own; this guide stays with two equal homes.

## Where a duplex can be built in Brisbane

A dual occupancy usually needs a development approval for a material change of use before a building certifier can approve the construction. Brisbane City Council explains that, under City Plan 2014, a dual occupancy is either code assessable or impact assessable. A code assessable application is decided against the plan's codes without public notification. An impact assessable application must be publicly notified before the council decides, which gives neighbours the chance to make submissions.

The level of assessment depends on the zone, the precinct and the building's height. Brisbane's page lists the cases where a dual occupancy is code assessable.

<figure class="fig"><figcaption><b>When a Brisbane dual occupancy is code assessable</b><span>Brisbane City Plan 2014, as summarised by Brisbane City Council</span></figcaption>
<div class="scroll"><table class="tbl">
<thead><tr><th>Zone and precinct</th><th>Condition for code assessment</th></tr></thead>
<tbody>
<tr><td>Low-medium density, up to 3 storeys precinct</td><td>Up to 3 storeys and 11.5 metres</td></tr>
<tr><td>Low-medium density, 2 or 3 storey mix precinct</td><td>Up to 3 storeys and 11.5 metres, if the site fronts a road reserve at least 15.5 metres wide and part of it is within 400 metres' walk of a railway or busway station</td></tr>
<tr><td>Low-medium density, 2 storey mix precinct</td><td>Up to 2 storeys and 9.5 metres</td></tr>
<tr><td>Character residential, infill housing precinct</td><td>Up to 2 storeys and 9.5 metres, and any house built in 1946 or earlier is retained</td></tr>
<tr><td>Medium density residential</td><td>Up to 5 storeys, or the height set by a neighbourhood plan</td></tr>
</tbody>
</table></div>
<p class="src">Brisbane City Council, dual occupancy page. Other zones, neighbourhood plans and overlays can change the level of assessment.</p></figure>

Two things follow for an investor. The list does not include the low density residential zone, so a duplex proposed there falls outside these code assessable cases and the plan's own assessment tables for that zone and site need checking. And a code assessable application still needs approval: the council's page says that even without public notification, an application must be lodged and approved before work starts.

Every proposal must also meet the plan's dual occupancy code, the relevant zone code and any secondary codes that apply. Overlays, such as flooding, character or bushfire, can add requirements. Brisbane City Council checks that an application is properly made, issues a fee quote under a points system and, if something is missing, gives the applicant 20 days to fix it.

Other councils run the same system with their own maps. Redland City Council, for example, says a dual occupancy may need approval as a material change of use, is subject to infrastructure charges, and that the level of assessment depends on zoning and overlays. Its page also points to part MP1.3 of the Queensland Development Code, which sets design and siting standards for duplex housing.

## The Gold Coast and the line the court drew

The City of Gold Coast's planning scheme shows how much the location test can matter. In a decision of the Planning and Environment Court delivered on 24 April 2024, on appeals against the City of Gold Coast, the judgment set out what version 8 of the Gold Coast City Plan said about dual occupancies in the low density residential zone. They were meant to occur in low concentrations, with a dispersed or scattered effect, and to be found on lots with dual frontage or on lots shown on the residential density overlay map with a designation of RD1 or greater.

The case concerned five houses, each approved by a building certifier as a single dwelling house but built as two dwellings divided by an internal wall, with the backyards split by 1.8 metre fences. After the council issued show cause notices, the owners applied for approval as dual occupancies, were refused and appealed.

The court found the smaller dwellings were subordinate, but that the two homes on each site were not used in conjunction with each other because the fences kept them apart. So the existing use was not a lawful dwelling house with a secondary dwelling. As dual occupancies, none of the sites met the dual frontage or overlay criteria, and the design fell short of the dual occupancy code on landscaping, articulation and the smaller dwellings' lack of a street connection. All five appeals were dismissed, and the court record notes that later appeals to the Court of Appeal were discontinued on 8 November 2024.

<div class="callout"><span class="mono">Before buying</span><h4>A "dual living" listing is not proof of an approved dual occupancy</h4>
<p>In the 2024 Gold Coast case, homes approved as dwelling houses were found not to be lawful once the two halves were fenced apart and no longer used together. The council's approval history for the land shows which use was approved.</p>
</div>

## From approval to two homes

The sequence for a new dual occupancy follows the same order in most councils, with the titling step optional. Brisbane City Council describes the planning stage, the building approval obtained afterwards from a licensed building certifier using detailed plans, and, on its subdivision pages, the separate approval needed to create new lots.

<figure class="fig"><figcaption><b>The usual order for a new dual occupancy</b></figcaption>
<ol class="steps five">
<li><b>Check the zone and overlays</b><span>The planning scheme sets whether the use is code or impact assessable on that lot.</span></li>
<li><b>Planning approval</b><span>A development application for a material change of use, publicly notified if impact assessable.</span></li>
<li><b>Building approval</b><span>A licensed building certifier approves the construction once planning approval is in place.</span></li>
<li><b>Reconfiguring a lot, if wanted</b><span>A separate approval to subdivide, usually prepared with a surveyor.</span></li>
<li><b>Plan sealing and registration</b><span>The council endorses the survey plan and new titles are issued on registration.</span></li>
</ol></figure>

Infrastructure charges belong in the budget from the start. Fraser Coast Regional Council bases its charges for a dual occupancy on two dwelling units, and Redland City Council lists infrastructure charges as part of a dual occupancy approval. The amount differs between councils.

## One title or two

A dual occupancy can stay on one title for its whole life. Both homes are then one parcel of land, owned by the same people, sold together and financed together. Some owners keep it that way for good.

The alternative is to reconfigure the lot. Brisbane City Council explains that subdividing, which the planning law calls reconfiguring a lot, usually needs a development application. Once the work is complete and all charges are paid, the council endorses the survey plan, a step known as plan sealing, and the sealed plan is registered so that new titles can issue from Titles Queensland. The council's subdivision fact sheet adds that most approvals require the land to be appropriately serviced, at the owner's cost.

Councils describe a titled duplex as lots in a community titles scheme, which brings a body corporate. Fraser Coast Regional Council says a dual occupancy can be subdivided through a standard format plan or a building format plan and sold separately. Redland City Council describes the result as each dwelling able to be tenanted or sold separately with its own title, sharing body corporate provisions, with common property such as a driveway where the design calls for it.

The two plan types draw the boundaries differently, and the difference decides who maintains what. The Queensland Government's body corporate pages set it out.

<figure class="fig"><figcaption><b>Standard format plan and building format plan</b><span>Who is generally responsible, as described by the Queensland Government</span></figcaption>
<div class="scroll"><table class="tbl">
<thead><tr><th>Item</th><th>Standard format plan</th><th>Building format plan</th></tr></thead>
<tbody>
<tr><td>Roof, exterior walls, doors, windows</td><td>Lot owner, within the lot boundary</td><td>Body corporate, where they sit in a boundary wall with common property</td></tr>
<tr><td>Foundations</td><td>Lot owner</td><td>Body corporate</td></tr>
<tr><td>Common property</td><td>Body corporate</td><td>Body corporate</td></tr>
</tbody>
</table></div>
<p class="src">Queensland Government, standard format plan and group titles plan maintenance page, last updated 28 March 2024. The plan registered for each scheme governs.</p></figure>

Insurance follows the walls. The same Queensland Government page says that where buildings share a wall, the body corporate must insure them for full replacement value. Where the buildings stand alone with no common walls, each lot owner is responsible for insuring their own building, while the body corporate must still insure common property and its assets. On that description, an attached duplex in a two-lot scheme is insured by the body corporate, even with only two owners.

## A body corporate of two

A body corporate with two members does not need the machinery of a large tower. Queensland has five regulation modules, and only one applies to a scheme at a time. The Queensland Government lists the Specified Two-lot Schemes Module as the least regulated, for schemes with two residential lots, and the Small Schemes Module for schemes of six lots or fewer.

The Two-lot Schemes Module applies when there are only two lots in the scheme, the community management statement says the module applies, and the lots are residential, or were when the statement was registered. It does not apply when the scheme has a letting agent or is part of a layered arrangement. Under the module, decisions are made by lot owner agreements rather than meetings. Each agreement must be in writing, dated, set out what was agreed and be signed by the owners of both lots. The body corporate may keep money in one or more accounts by agreement, but the government's page notes that it is not required by law to do so.

The developer sets the module when the scheme is registered, and the module is shown in the community management statement held by Titles Queensland. The developer also sets the lot entitlements. The Queensland Government explains that the contribution schedule divides most body corporate costs, such as levies, while the interest schedule, set by default on market value, determines each lot's share of common property if the scheme ends and the lot's value for calculating council rates and charges.

Once one half is sold, the other owner has an equal say, so the community management statement and any existing agreements are worth reading before a contract is signed.

## Water meters and two tenancies

Separate homes need separate services if each is to be let and billed on its own. Fraser Coast Regional Council says a dual occupancy may have separate service connections or sub-metering, unlike a secondary dwelling, which must keep one water meter and one utility bill.

For water, the State's rules go further when lots are created. A Building Codes Queensland newsflash issued on 8 April 2008 records that, for plumbing applications lodged from 1 January 2008, the Queensland Plumbing and Wastewater Code requires a sub-meter for each separate lot and for the common property in a community titles scheme. Logan City Council's fact sheet on sub-metering adds that retrofitting sub-meters to older multi-unit developments is not compulsory, and that where sub-meters exist, the water provider can bill each owner for actual use. The Queensland Government's lot entitlement page notes that separately metered services, such as water and electricity, are billed by providers to each owner directly rather than divided by lot entitlement.

Metering matters most when the homes are let. The Residential Tenancies Authority says a lessor can pass on water consumption charges only when the premises are individually metered, the premises are water efficient, the tenancy agreement says the tenant pays for water consumption, and the tenant receives a copy of the bill within four weeks of the owner receiving it. Fixed water access charges stay with the owner, and sewerage charges cannot be passed on. The authority also says that where a building uses sub-meters, charges can be passed on under those conditions; when the owner or property manager reads the sub-meter, the charge must be passed on within four weeks of the provider's bill, otherwise the tenant does not have to pay.

A duplex on one shared meter fails the first of those conditions, so the owner carries the water use of both sides. That cost is easy to miss in a yield calculation built on two rents.

The conditions attach to each set of premises and each tenancy agreement, so when only one of the two homes has its own meter, only that tenant can be asked to pay for water use.

## Land tax on two homes

Queensland land tax is worked out on the total taxable value of the freehold land an owner holds at midnight on 30 June. The Queensland Revenue Office says individuals are liable when that total reaches $600,000 or more. A duplex on one title is one parcel with one land value; a duplex split into two lots becomes two parcels, each with its own value, and each counted towards the owner's total.

The home exemption is where the two-home layout needs care. The Queensland Revenue Office's page on the home exemption for individuals, last updated 16 September 2026, allows an "allowable letting" of part of a home, such as a room or granny flat, without losing the exemption, provided among other conditions that the leased area is not more than 50 per cent of the total floor area of all residential areas on the land. Where land is used both as a home and for another purpose, the office may grant a partial exemption instead, for the part used as the home, and it decides those applications on their circumstances.

Public Ruling LTA000.1.3, issued on 18 June 2025, explains the approach. It requires the land to be one parcel, meaning an area of land that is separately valued, and its examples show that separately titled units are separate parcels. In one example, a house divided so that the leased area exceeded half the floor area left the owner with only a partial home exemption. In another, an owner living in one of six flats on one parcel received a partial exemption, apportioned by floor area.

For an owner who lives in one side of a duplex and lets the other, the answer therefore turns on facts: one title or two, the floor area of each side, and the rent charged. On two titles, the let half is a separate parcel and is not the owner's home. On one title, the ruling's floor-area and allowable letting tests apply. This is a question for the Queensland Revenue Office or a tax adviser before the purchase, not after the first assessment notice.

## Depreciation pointers

The federal tax rules for rental property apply to each dwelling that is let, and a new duplex brings two sets of building costs and fittings. Two points from the Australian Taxation Office are worth knowing before talking to an accountant.

The first is the capital works deduction for the building itself. The ATO's page, last updated 22 June 2026, says residential construction that started on or after 16 September 1987 can generally be deducted at 2.5 per cent a year, which spreads the deduction over 40 years. Only the period when the property is used to earn income counts, so an owner who lives in one side cannot claim for that side. Where the construction cost is not known, the ATO accepts an estimate from a quantity surveyor or another independent qualified person, and the fee for that estimate is itself deductible.

The second is the decline in value of depreciating assets in the rental property, which a quantity surveyor's report may list in a separate schedule. The same ATO page says that, for properties bought on or after 9 May 2017 to provide residential accommodation, deductions for these depreciating assets are generally limited to properties that are brand new or substantially renovated, subject to timing rules. An investor who builds a new dual occupancy is in a different position from one who buys an older duplex, and the difference shows in the depreciation schedule.

How rental losses are treated under negative gearing is a separate subject. For a duplex, the point is simply that each dwelling has its own income, its own deductions and, once titled, potentially its own sale and capital gains outcome.

> A duplex is two homes in the eyes of a tenant, but the council, the titles register and the tax office each decide for themselves how many there are.