Dual Occupancy Builders Melbourne
Vector Homes helps Melbourne landowners assess, design and build boutique dual occupancy and duplex projects with a builder-developer approach.
A developer-informed approach that reduces risk, controls cost and protects your outcome.
Working with homeowners and developers across Melbourne’s eastern suburbs.
Can your property genuinely support a Duplex?
Not every block that looks suitable for a dual occupancy or duplex will necessarily produce a good development outcome.
Before committing to plans, planning applications or significant consultant costs, there are five areas we believe should be understood.
01 - Site and access
Land size matters, but frontage, orientation, slope and vehicle access can have just as much influence over what can realistically be achieved. A well-proportioned site can often produce a better development outcome than a larger but more constrained block.
02 - Planning and trees
Zoning, overlays, setbacks, garden-area requirements, existing vegetation and neighbouring conditions all influence the development envelope.
04 - Product and market
The objective isn't simply to fit two dwellings onto a block. The size, layout, accommodation, specification and architectural response should reflect the people ultimately expected to live in.
03 - Services and drainage
Stormwater, sewer, power, existing easements and site levels can materially affect both design and construction cost, and should be investigated early prior to design.
05 - Commercial feasibility
A development can achieve planning approval and still make little commercial sense.
Land value, construction costs, consultant and authority costs, finance, holding costs and expected end value all need to be considered before committing significant capital to the project.
The strongest projects bring these five considerations together before design becomes fixed.
One major site, planning, access or service constraint can outweigh several positive attributes. The right time to identify that constraint is before substantial money is committed to design and documentation.
Why Early Decisions Matter
Most expensive development mistakes are created well before construction begins.
A design that doesn't respond properly to planning constraints, construction cost or the intended market can lead to redesign, delays and compromised financial outcomes.
That's why Vector approaches feasibility, design, planning and construction as one connected process.
Our Approach
At Vector, we guide projects from feasibility and concept through to construction, ensuring design ambition remains grounded in planning and construction reality.
By aligning planning, design and build from the outset, we reduce risk, avoid redesign and support confident decision-making throughout the process.
Where the site and proposal meet the relevant VicSmart eligibility criteria, we aim to design within the applicable Clause 55 standards, allowing eligible two-dwelling projects to access Victoria's streamlined 10-business-day VicSmart assessment pathway.
Design that Balances Yield and Liveability
Successful dual occupancy projects require more than maximising yield - they need to work as homes.
We focus on creating well-resolved layouts that balance:
Efficient use of the site
Strong street presence
Functional, liveable internal planning
Long-term market appeal
Rather than over-designing or forcing yield at the expense of quality, we take a more considered approach - ensuring each dwelling feels complete, practical and aligned with buyer expectations.
The result is a project that performs not just on paper, but in the market.
Your Project Journey
A clear, structured path from feasibility through to construction.
01 — Feasibility
Assess site constraints, zoning, overlays and development potential
02 — Concept & Strategy
Develop layouts that balance yield, design quality and buildability
03 — Planning Approval
Prepare and manage town planning documentation and approvals
04 — Documentation
Resolve construction details early to reduce variation risk
05 — Construction
Deliver with cost control, clear communication and discipline
A process designed to reduce risk, maintain clarity and protect your outcome.
Boutique Duplex - Doncaster East
Who this suits
This approach is best suited to clients who:
Own land and are exploring its development potential
Want clarity before engaging architects or consultants separately
Value considered design over volume-driven outcomes
Prefer early cost visibility and structured guidance
This is not a speculative, high-density development model. It is a boutique, considered approach to dual occupancy.
Grounded in Real-World Delivery
Our experience delivering dual occupancy projects provides insight into:
Planning pathways and approval strategies
Construction efficiencies and cost control
Market positioning and buyer expectations
This ensures each project is not only well-designed, but intelligently resolved.
Selected Dual Occupancy Projects
Stoke
A boutique townhouse development carefully resolved to balance planning compliance, refined contemporary form and long-term market positioning.
Cyril
A thoughtfully planned dual occupancy designed to maximise site potential while maintaining clarity in construction methodology and delivery.
Loxley
A considered duplex project shaped by site constraints and neighbourhood context, delivering efficient layouts without compromising architectural restraint.
FAQs
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On average, construction costs for a high-quality dual occupancy in Melbourne range from $650,000 to $1,000,000+ per unit. For premium, custom-designed builds, costs typically sit between $3,000 and $4,000 per square metre. Factors like site slope, council requirements in areas like Manningham, Whitehorse or Boroondara, and the level of internal finishes will influence the final investment.
For a more detailed breakdown, you can view our dual occupancy cost guide.
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While no minimum lot sizes exist per se, most require a mandatory minimum garden area based on the total size of the lot, as well as clause 55 (rescode) regulations that govern minimum setbacks and private open space requirements.
As a general guide, sites above 500–600sqm with adequate frontage provide greater flexibility - however, each site must be assessed individually.
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Timeframes vary depending on planning complexity and council responsiveness, however, with the introduction of the latest Vic Smart applications, deemed to satisfy applications are being turned around much faster, but the typically range between:
• 6-10 months for design and planning approval
• 8–12 months for constructionOverall project durations commonly span 18–24 months, assuming no delays between activating the next stage.
Clear sequencing and early alignment help avoid unnecessary delays.
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Yes.
Our integrated model coordinates planning documentation, consultant engagement and submission management.
Because we are involved from the outset, the design intent and construction methodology remain aligned with regulatory requirements throughout the approval process.
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A dual occupancy generally refers to two dwellings on a single land title. A duplex is a specific type of dual occupancy where the two homes are semi attached, often sharing a common central wall.
Explore the Potential of Your Site
If you are considering a dual occupancy project and would value early alignment between feasibility, design and construction, we welcome an initial discussion.
Not ready to book a consultation?
Download our Dual Occupancy Guide - a practical overview of what’s achievable, typical costs and how to approach your site.