Marketed as "Dual Income" — But Is It Legal? How to Check What a Melbourne Property Can Really Do

A property advertised as "dual income" or with multiple rental streams is only lawful in that form if the relevant planning and building requirements have been met. Depending on the property's configuration, this may mean council approval for a second dwelling or development, or eligibility under Victoria's small second dwelling planning exemption introduced in December 2023. A professionally drawn floor plan or an existing tenancy arrangement is not evidence that the use has been approved.

Before signing a contract, buyers should independently:

Check the property's planning history with the local council.

Compare that information against the Section 32 Vendor Statement.

Confirm whether any second dwelling or additional use is approved, exempt, or protected by existing use rights.

Doing this due diligence before exchange can prevent expensive compliance issues after settlement.

Dual Occupancy vs. Small Second Dwelling: Know the Difference

These terms are often used interchangeably in marketing, but they have very different legal meanings.

Dual Occupancy

A dual occupancy generally refers to two separate self-contained dwellings on the same lot, each capable of functioning as an independent home.

In most cases this requires:

Planning approval from the local council.

Assessment against the Victorian Planning Provisions, including Clause 55 (ResCode) where applicable.

Compliance with neighbourhood character, setbacks, open space, parking and other planning controls.

Depending on the council and complexity of the proposal, the planning process can take several months and may involve public notification to neighbouring properties.

Small Second Dwelling

A small second dwelling (formerly commonly called a granny flat) is a much narrower planning category.

Since Amendment VC253 commenced in December 2023, eligible properties may be able to construct a self-contained dwelling of 60 square metres or less without obtaining a planning permit.

However, important limitations still apply:

The lot must satisfy the exemption requirements.

Certain planning overlays may remove the exemption.

Building permits are still required.

All Building Code and siting requirements continue to apply.

The exemption simplifies planning approval—it does not remove the need to comply with building laws.

Because these categories have different legal requirements, buyers should be cautious when marketing material uses terms like "dual income", "granny flat", "dual living" or "potential second residence" interchangeably.

What Overlays and Zones Mean for Development Potential

Planning controls extend well beyond a property's zoning.

Many Melbourne properties are also affected by planning overlays that can significantly restrict development opportunities.

Common examples include:

Heritage Overlays.

Significant Landscape Overlays.

Vegetation Protection Overlays.

Bushfire Management Overlays.

Flood-related overlays.

An otherwise suitable block may lose planning exemptions or require additional approvals because of these controls.

Every Victorian council publishes planning maps showing applicable zones and overlays for individual properties. Buyers should verify these directly rather than relying solely on advertising material or agent summaries.

How to Verify Before You Buy, Not After

Three checks are particularly important before committing to a purchase.

1. Check Council Planning Records

Request a planning property enquiry from the relevant council to determine whether approvals exist for:

A second dwelling.

Dual occupancy.

Subdivision.

Change of use.

Other relevant planning permits.

2. Review the Section 32 Carefully

The Section 32 Vendor Statement should disclose information including:

Zoning.

Planning overlays.

Building permits issued within the required disclosure period.

Other matters affecting the property.

If important information is missing or inaccurate, buyers should seek legal advice before proceeding.

3. Confirm Any Existing Use Rights

Some properties continue to operate under existing use rights where the use lawfully predates current planning controls.

However, these rights are often misunderstood.

They are generally limited in scope and may not automatically extend to altered layouts, expanded uses or new tenancy arrangements. Whether existing use rights apply depends on the property's specific planning history and should be confirmed rather than assumed.

What This Means for Buyers

Marketing descriptions should never replace legal due diligence.

If a property is promoted as offering dual income, buyers should independently verify that the additional dwelling or rental arrangement is actually lawful. Existing tenants, rental returns and attractive floor plans do not prove that council approvals exist.

If approvals cannot be confirmed, buyers may inherit planning or compliance issues that affect financing, insurance, future development or resale value.

Working with an experienced buyer's advocate alongside a conveyancer can help identify these issues before contracts are signed. This includes verifying planning approvals, reviewing zoning and overlays, examining the Section 32, and confirming whether any claimed dual-income use is legally supported—allowing buyers to make decisions based on documented facts rather than marketing claims.

Forge Real Estate Melbourne can help you blueprint your future by finding the perfect blue-chip property where your lifestyle needs and investment goals converge.

📞 Phone: (03) 91003633

✉️ Email: info@forgeproperty.com.au

🌐 Website: www.forgerealestate.com.au

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