As an indicative guide, building a dual occupancy in Melbourne typically costs in the order of $700,000 to $1.4 million for the two dwellings combined (before land), based on construction at roughly $2,800–$3,800 per m² plus site works, professional fees and permits. The figure varies widely with dwelling size, specification level, site conditions and council requirements, so treat these as a starting point for budgeting rather than a quote. This guide breaks the cost into its parts and explains what moves it.
This is general information about development costs in Victoria, not a quote or financial advice. SQM Architects can assess build-cost feasibility and yield for your site; figures here are indicative and exclude land and end-value or profit estimates, which depend on the market and a valuer’s or quantity surveyor’s input.
Dual occupancy build cost breakdown (indicative)
The construction of the two dwellings is the largest cost, but a realistic project budget also includes demolition, site works, professional fees, permits and contingency. For two dwellings of around 180 m² each (≈360 m² total), the indicative components are:
| Cost component | Indicative range |
|---|---|
| Construction (two dwellings, ~360 m² total) | ~$1.0M – $1.3M (at ~$2,800–$3,800/m²) |
| Demolition of existing dwelling (if required) | ~$20,000 – $45,000 |
| Site works / service connections / crossovers | ~$30,000 – $90,000+ (site-dependent) |
| Design & documentation (architect/draftsperson) | ~5–12% of build cost |
| Town planning, surveyor & consultants | ~$10,000 – $30,000 |
| Council planning & building permit fees | See dual occupancy permit costs |
| Contingency | ~5–10% of total |
For a smaller or lower-specification dual occupancy the total can sit nearer the lower end; for larger dwellings, a sloping or constrained site, or a high specification, it can exceed the range above.
What is the build cost per square metre?
As an indicative guide, dual occupancy construction in Melbourne runs at roughly $2,800–$3,800 per m² in 2026 for a standard to mid specification, with high-specification or constrained builds higher. Per-m² rates are a useful first-pass tool, but the binding number for your project depends on the builder’s detailed quote against documented plans — the rate alone does not capture demolition, site works or external costs.
What moves the cost up or down
The biggest cost drivers on a dual occupancy are dwelling size, specification level, and site conditions.
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- Dwelling size — more floor area means more construction cost; this is the single largest lever.
- Specification level — fixtures, finishes, joinery and façade treatment can shift the per-m² rate substantially.
- Site conditions — slope, soil/rock, demolition, tree protection and difficult access all add cost.
- Service connections — new water, sewer, drainage, power and a second crossover can be a significant variable item.
- Council and ResCode requirements — landscaping, tree canopy, on-site stormwater detention and overlay controls can add cost.
- Configuration — side-by-side vs front-and-back affects services, driveways and build complexity.
Build cost vs total project cost
The build cost is only part of the picture — a realistic total project budget (before land) adds demolition, site works, professional and consultant fees, permit fees and a contingency on top of construction. If you are buying a site, the land cost is additional and usually the largest single number. A site-specific feasibility assessment is the reliable way to pin down the realistic build cost and the dwelling yield your block can actually support before you commit. To compare with the alternative product, see our guide on how much it costs to build townhouses in Melbourne, or weigh the options in our knockdown rebuild, dual occupancy or subdivide decision guide.
Plan your dual occupancy with confidence
Knowing the realistic build cost and achievable yield up front helps keep a dual occupancy project on track. SQM Architects (ARBV Reg. No. 51498) assesses build-cost feasibility, massing and yield for dual occupancy sites across Melbourne. Book a feasibility assessment to confirm what your site can support and what it is likely to cost to build.
Frequently asked questions
How much does it cost to build a dual occupancy in Melbourne?
As an indicative guide, a dual occupancy build in Melbourne typically costs in the order of $700,000 to $1.4 million for the two dwellings combined (before land), based on construction at roughly $2,800–$3,800 per m² plus demolition, site works, professional fees, permits and contingency. The figure varies widely with dwelling size, specification and site conditions, so confirm with a builder and quantity surveyor for your project.
What is the build cost per square metre for a dual occupancy?
As an indicative guide, dual occupancy construction in Melbourne runs at roughly $2,800–$3,800 per m² in 2026 for a standard to mid specification, with high-specification or constrained builds higher. The per-m² rate is a first-pass estimate only — the binding figure comes from a builder’s quote against documented plans.
What costs are there beyond construction?
Beyond the build itself, budget for demolition (if required), site works and service connections, design and documentation (typically 5–12% of build cost), town planning and surveyor fees, council planning and building permit fees, and a contingency of around 5–10%. If you are buying the site, land is an additional and usually larger cost.
Is a dual occupancy cheaper to build than townhouses?
Not necessarily — on a per-dwelling basis the rates are similar, and the total depends on the number and size of dwellings, the specification and the site. A dual occupancy is two dwellings; a townhouse development of three or more spreads some fixed costs across more dwellings but adds Owners Corporation and shared-infrastructure costs. A feasibility assessment is the reliable way to compare options for a specific site.
This article provides general information only. For project-specific guidance, consult with qualified professionals.
SQM Architects — ABN 32 600 928 390, ARBV Reg. No. 51498. This article is general information about Victorian development costs, not personal, legal or financial advice.
