Duplex or townhouse: which is better?
In the duplex vs townhouse choice, a duplex usually suits an owner building on one Sydney block because it needs less land. It also usually gives each home its own street frontage. Townhouses put three or more homes on a larger site, often around a shared driveway. That tends to suit a development project more than a family building to live in.
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What separates a duplex from a townhouse
The difference starts with how many homes share the land. A duplex is what NSW planning calls a dual occupancy, which means two dwellings on one lot, either joined by a party wall or standing apart. Townhouses belong to multi dwelling housing, defined as three or more dwellings on one lot with each home reached at ground level.
NSW Planning describes townhouse developments as homes arranged around an internal street or lane network. The two storey versions are known as townhouses and the single storey ones as villas. Terraces are a related type where every home is attached and faces the public road, much like the older rows across the inner city.
Land, zoning and approvals
Land is usually the first thing that rules townhouses in or out. In low and mid-rise housing areas near nominated stations and town centres, the state standard for a duplex starts at a 450 m² lot that is 12 m wide. Multi dwelling housing starts at 600 m² in the same areas, while terraces need 500 m² with an 18 m width.
Zoning narrows the choice further, because dual occupancies are permitted with consent in R2 low density zones right across NSW. Townhouses are only permitted in R2 zones inside those low and mid-rise housing areas unless a council's own plan allows them. On a typical R2 block away from a station, a duplex is often the only way to build a second full home.
More homes also bring more to resolve on parking, landscaping and neighbours during approval. Our guide to whether you can build a duplex on your property sets out the lot sizes, zones and approval pathways for two homes.
Living in each one
Living in a duplex feels close to living in a house. You share one wall with one neighbour and you have your own front door and garden. Once the pair is subdivided into Torrens title lots, each owner holds their home and the land under it.
Townhouses can suit people who want a smaller home with less garden to look after, although they come with more neighbours and more shared ground. When a townhouse development is strata titled, the owners share the common property and pay levies to an owners corporation that looks after it. Decisions about the whole site are then made together rather than by each owner alone.
Selling and holding value
A duplex usually gives each home its own frontage and, once subdivided, its own land. That means the finished homes can appeal to the same buyers who are looking for a house in the street. A well-designed pair can compete at the top of the market.
We designed and built [ SOL ], a duplex a block back from Bondi Beach. When it sold at auction in December 2025 for $9.4 million it set a Bondi Beach suburb record for a duplex. You can read how we designed and built SOL and the decisions behind its curved forms and natural finishes.
Which is better for you
If you own a single block and want to live in one home while selling, renting or handing down the other, a duplex is usually the better fit. The site, the approvals and the build all stay at the scale of a family home. Townhouses make more sense on a large or amalgamated site where the aim is to create and sell several homes.
We design and build duplexes as one team, shaping both homes together so each has its own light, privacy and outdoor space. For a sense of the budget first, read our guide to what it costs to build a duplex in Sydney. When you are ready, our duplex builders in Sydney can talk through your block with you.
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