A duplex is a development project wearing the clothes of a house. The margin is decided before design, by the zone, the frontage, the sewer alignment and the services capacity.
These articles cover the feasibility checks worth doing before you buy, how the title path affects the build, and whether a duplex or a single house performs better on a given site.
Feasibility should produce a straight answer rather than an encouraging one: this site supports two dwellings of roughly this size, at roughly this cost, over roughly this program. Anything vaguer is optimism with a spreadsheet attached.
The checks that most often rule a site out are frontage and sewer alignment, and both can be established before you buy. Frontage drives the driveway, the parking and whether two dwellings can be arranged at all. A sewer main crossing the block can consume an entire development margin.
The other decision that has to happen early is the exit. Holding and renting rewards durability and practical layout; selling to owner-occupiers rewards finish level and street appeal; and selling the halves separately requires the title path to be designed in from the start rather than retrofitted.
7 articles in Duplexes
Duplex and Townhouse Builds: What Investors Should Plan Early
Key planning points for duplexes and townhouses, including site feasibility, approvals, layouts, budget control, and resale appeal.
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Granny Flats and Secondary Dwellings in Queensland: What's Allowed
How secondary dwellings work in South East Queensland — size limits, council rules, whether you can rent them out, and what they cost to build properly.
ReadWhat Does It Cost to Build a Duplex in Brisbane?
The cost drivers that actually decide a Brisbane duplex budget — site conditions, approvals, services and specification — and where investors most often get caught.
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Dual Occupancy Feasibility: What to Check Before You Buy the Block
The eight checks that decide whether a South East Queensland site supports a duplex — zone, frontage, services, title path and more — before you commit any money.
ReadSplitting a Duplex: Subdivision or Community Title?
The two ways to separately title a Queensland dual occupancy, how each affects the design and services, and why the decision has to be made before you build.
ReadDuplex or Single House: Which Performs Better as an Investment?
A straight comparison for South East Queensland investors — yield, land content, resale market, finance, and the situations where each wins.
ReadDual Key and Secondary Dwellings: A Middle Path for Investors
Where a secondary dwelling beats a full duplex on cost and approvals, the restrictions that apply in Queensland, and how it affects valuation.
ReadGot a question about your own block? Ask us directly.
Send through the address and what you have in mind. We will review the zoning, the overlays and the site conditions and come back with a straight assessment.