One of the most common questions we hear from investors is simple:
“Can I build two on this block?”

The more important question is whether the block is suitable for a profitable and low-risk dual occupancy project. Just because a site allows two dwellings does not mean it should.

In Melbourne’s current environment, where holding costs, interest rates, and construction pricing remain key considerations, site selection has become one of the biggest drivers of success. Experienced developers understand that the right block reduces risk, simplifies approvals, and improves profit.

Here are the key factors that determine whether a site is genuinely suited to dual occupancy.

1. Zoning and planning controls

The starting point is always planning. Zoning determines whether dual occupancy is permitted, but overlays and local policies often have a greater influence on the final outcome.

Neighbourhood character overlays, heritage controls, vegetation protection, and design guidelines can all limit development potential. These factors may reduce building envelopes, increase setbacks, or require more complex design solutions.

A site that appears straightforward can become challenging once planning constraints are fully understood. This is why a high-level zoning check is not enough. A detailed review of planning controls early in the process can prevent costly delays and redesign.

2. Land size and usable area

While minimum lot sizes provide a guide, usable land area is more important than total size.

Key considerations include:

• Easements
• Significant trees
• Irregular shapes
• Required setbacks
• Access widths

A block may technically meet minimum requirements but still produce compromised layouts that reduce resale value.

The most successful dual occupancy sites allow for functional, well-proportioned dwellings with strong natural light, private open space, and practical vehicle access. These factors influence buyer demand and ultimately impact profit.

3. Frontage and access

Frontage is a major factor in both design flexibility and approval success.

Wider frontages allow:

• More efficient layouts
• Better street presence
• Reduced design compromises
• Improved buyer appeal

Narrow sites often lead to design complexity and can increase construction costs. Access requirements for driveways and vehicle turning also become more challenging.

Councils often favour designs that maintain a balanced streetscape, which can be easier to achieve on wider blocks.

4. Topography and site conditions

Flat or gently sloping sites typically offer the most predictable outcomes.

Steep blocks can still be developed, but they introduce:

• Additional excavation
• Retaining structures
• Complex drainage
• Higher construction costs

Similarly, reactive soils or rock can significantly affect footing systems and budgets.

Understanding these conditions early allows feasibility to reflect reality rather than assumptions.

5. Services and infrastructure

Infrastructure capacity is another critical consideration.

Older suburbs may require upgrades to:

• Sewer
• Stormwater
• Electricity
• Water supply

These costs vary widely and are often overlooked by first-time developers.

A services assessment during feasibility can identify risks and provide clarity on connection costs and timing.

6. Market demand and resale potential

Even a technically suitable site may not be commercially viable.

The most profitable projects align with buyer demand in the local area. This includes:

• Target demographics
• Price ceilings
• Layout preferences
• Parking expectations
• Quality and specification levels

For example, dual occupancy may perform well in family-oriented suburbs with strong demand for low-maintenance homes. In higher-density areas, townhouse developments may produce stronger results.

Understanding the end buyer before committing to a site reduces both risk and holding time.

A strategic approach to site selection

Experienced developers rarely rely on a single factor. Instead, they assess planning, buildability, cost, and market demand together.

At delcon, feasibility is not just about determining whether a project is possible. It is about determining whether it is worth doing.

This includes early builder input, realistic cost modelling, and a clear understanding of local council expectations. These steps help reduce uncertainty and create stronger, more predictable outcomes.

If you are considering a dual occupancy project in Melbourne, taking the time to evaluate these factors before purchasing can significantly improve your results and confidence across the entire development process.

Contact us today on: 1800 335266 or email: info@delcon.net.au