The landscape of high-end residential architecture is undergoing a quiet, yet profound transformation
A dual occupancy is two dwellings on one lot; a townhouse development is three or more. Both are assessed under Clause 55 of the Victoria Planning Provisions and the Townhouse and Low-Rise Code, and both always need a planning permit. Which one your block supports comes down to its width, zoning and overlays, not preference.
If you’re sitting on a block with more potential than one house needs, you’ve probably run into two terms that get thrown around almost interchangeably: dual occupancy and townhouse development. They’re not the same thing, and which one your site actually supports comes down to zoning, shape and what you want the land to do for you. Here’s how to tell them apart, and how to work out which one fits your block in Victoria.
A dual occupancy is two dwellings on one lot, side by side, or one behind the other. A townhouse development typically means three or more dwellings on the same site, usually two storeys, sharing walls and a common driveway. The real distinction isn’t the word, it’s the density: how many homes the block carries, and how much land each one ends up with.
Two dwellings generally means more private open space, wider gaps between buildings and a layout that still feels like “a house” to live in. Three or more pushes toward smaller footprints per dwelling, shared access and tighter setbacks, a trade-off that suits maximising yield more than it suits an owner planning to live in one and keep the other in the family.
Close enough for most purposes. A duplex is a dual occupancy where the two dwellings are attached under one roofline and share a common wall. A detached dual occupancy keeps them separate, often one at the front, one at the rear. “Duplex” describes the built form; “dual occupancy” is the planning term Victorian councils actually use, which is worth knowing before you start searching for information, since a lot of what comes up online describes New South Wales rules that don’t apply here.
Both a dual occupancy and a townhouse development are assessed under Clause 55 of the Victoria Planning Provisions, the standard covering two or more dwellings on a lot. Since March 2025, Clause 55 has operated alongside the new Townhouse and Low-Rise Code, a state reform that introduced a “deemed to comply” pathway: if your design meets the Code’s standards on things like street setback, building height and neighbourhood character, council must treat those objectives as satisfied, which can mean a faster, more certain permit process with less exposure to third-party appeal.
The Code also locks in mandatory garden area requirements, typically 25 to 35 per cent of the site is kept as a genuine unroofed, unpaved garden, depending on lot size and zone. That requirement doesn’t shrink because you’ve added a third dwelling instead of a second, which is exactly why a wide block can sometimes carry three homes comfortably while a long, narrow block of the same total area only ever comfortably carries two.
Your zone sets the ceiling before any of this comes into play. The General Residential Zone is the most accommodating of the two. The Neighbourhood Residential Zone is written specifically to protect established suburban character, and typically caps height and dwelling numbers more tightly. Either way, a planning permit is always required, there’s no pathway around that for two-or-more-dwelling development in a residential zone.
This is genuinely a site question before it’s a preference question. In established Geelong suburbs like Belmont, Highton and Waurn Ponds, where dual occupancy and small townhouse applications regularly come before council, the deciding factor is almost never what the owner wants first; it’s what the block’s width, frontage, overlays and zoning schedule will actually support.
A few things worth weighing before you commit to a direction:
This is where a feasibility conversation before design fees are spent saves you from finding out the hard way that a block won’t carry what you were planning for it. Build with Herman runs that assessment against your zone, your block’s real dimensions and the Townhouse and Low-Rise Code’s current standards, rather than working backwards from a design you’ve already fallen in love with.
Because every client works with one dedicated point of contact through the whole project, the answer you get on dual occupancy versus townhouse isn’t handed off between departments, it comes from the same person managing your costing, your timeline and your build through to handover. Where a site calls for structural steel to make a tighter footprint or a shared driveway work properly, that’s handled in-house rather than subcontracted out and re-quoted. You can see the calibre of finish this approach produces across our completed luxury builds, and how the same team approaches multi-dwelling sites specifically on our multi-unit developments page.
Whichever direction your block points you toward, the process runs through the same broad stages:
Dual occupancy and townhouse development aren’t interchangeable terms, they’re two different answers to what your block can carry, and the right one depends on your site’s width, zoning and what you actually want from the outcome. Before any design work begins, it’s worth having that feasibility conversation properly. Book a development consultation with Build with Herman and find out what your block will genuinely support.
