Dual occupancy, in plain terms, means two dwellings on one lot. The form varies. It may be side by side, one behind the other, or a second dwelling beside a house that stays. What is allowed in one council area can be refused in the next. State rules and the local planning scheme decide, not a general rule of thumb.

Why owners look at it

Some want a home for family on the same land. Some want a second dwelling that can be leased. Some want the option of a later title change. Those are different objectives. A design that suits one can be a poor fit for another, and rental income is not a reason to skip the planning question.

What to check on the site

• Minimum lot size, frontage and any overlay that reduces what the zone appears to allow.
• Access and parking for both dwellings, including bins and visitors where the scheme requires them.
• Private open space, overlooking and the effect on neighbouring homes.
• Services: sewer, stormwater, power and whether an upgrade is likely.
• Title: one lot today does not mean two titles later. Subdivision is a separate application.

Treat it as a project

Design, planning fees, construction, finance and holding costs sit on one side. The use you want sits on the other. If the numbers only work when every assumption is favourable, the site may not be the right one. A planner or designer who has read the controls for that address is more useful than a generic floor plan.

This is general information, not personal financial, legal or planning advice. Planning rules differ by state and by council, and they should be checked for the specific property.