How Much Does It Cost to Build a Duplex in Melbourne (2025–2026)?

Whether you’re a seasoned investor, a downsizer, or a family looking to maximise land value, building a duplex in Melbourne has never been more strategic. But the big question remains: what is the actual cost of building a duplex in 2025–2026?

This definitive guide by Gidaya Group will walk you through average price ranges per square metre, cost influencers, suburb factors, and the must-know details to plan your duplex build.

Average Duplex Building Costs in Melbourne (2025–2026)

In 2025, the cost to build a duplex in Melbourne varies based on design complexity, land conditions, and build quality. However, here’s a reliable average based on current industry benchmarks:

For a standard 3-bedroom duplex of 150m² per dwelling:

• Basic: ~$720,000 total

• Mid-range: ~$870,000 total

• Premium: $960,000–$1.25M total

All figures include estimated construction, finishes, and compliance costs. Land not included.

Why Duplexes Are Booming in Melbourne

• Rising land prices in inner and middle-ring suburbs

• Desire to downsize without relocating

• Dual income opportunity: rent one, live in one

• Multigenerational living solutions

• Better capital growth per m² vs standalone homes

The duplex model is now preferred by many developers over traditional detached homes or even townhouses due to its flexible planning options and strong buyer appeal.

Factors That Impact Duplex Build Costs

1. Design Complexity

Two mirrored layouts cost less than custom split-levels. Premium façades, architectural styling, and double garages increase pricing.

2. Land Condition

Soil reactivity, site slope, and access difficulty affect site prep and foundation costs.

3. Planning Overlays

Heritage, vegetation, or flood overlays increase costs due to extra reports and build constraints.

4. Zoning & Permit Requirements

Melbourne councils require specific permits and assessments for dual occupancy builds. Gidaya Group manages these to minimise delay.

5. Build Inclusions

Kitchens, flooring, cladding, and insulation levels vary widely. Full turnkey packages can simplify costs.

Best Melbourne Suburbs for Duplex Development in 2025

Based on current market dynamics, these suburbs offer strong feasibility:

How Gidaya Group Helps You Maximise ROI

From concept to completion, Gidaya Group offers a complete solution:

• Feasibility assessments

• Site due diligence and acquisition advice

• Council planning and permits

• Architectural design and engineering

• Fixed-price duplex construction

• Compliance and subdivision assistance

This builder-led approach ensures your duplex is built faster, smarter, and more profitably.

FAQs

Q: Can I build a duplex on any block in Melbourne?
Not always. Zoning, overlays, and minimum block widths apply. Gidaya Group offers site checks.

Q: Is it cheaper to build two townhouses or a duplex?
Duplexes typically have lower construction and planning costs per unit due to shared design and infrastructure.

Q: What is included in a turnkey duplex?
Turnkey builds usually include flooring, kitchens, bathrooms, appliances, landscaping, driveways, and more.

Final Thoughts from Gidaya Group

Building a duplex in Melbourne in 2025–2026 remains one of the most efficient and profitable development strategies.

With land scarcity increasing and housing demand shifting toward flexible, multi-use living options, duplexes represent a smart investment.

Whether you’re an investor, a downsizer, or developing for family, Gidaya Group’s end-to-end duplex solution helps you:

• Unlock land value

• Minimise cost risk

• Streamline planning

• Maximise rental return or resale

Need a tailored duplex cost estimate?
Book a free feasibility consult with Gidaya Group today.