Project sector
Duplex & Dual Occupancy
A dual occupancy is two dwellings on a single lot, attached or detached. In many residential zones it can be approved as complying development where the lot meets the minimum size and the design satisfies each standard, frequently with subdivision to create separate titles.
Overview
Dual occupancy development is assessed against the Codes SEPP, including the housing diversity provisions. Eligibility turns first on the zone and the minimum lot size and width, then on the design meeting each numerical standard for the dwelling type.
Where the dwellings are to be sold separately, subdivision, whether Torrens or strata, is part of the project and can often be certified under the same code. Where a standard cannot be met, the dual occupancy proceeds by development application instead.
Typical pathway
- 01
Eligibility
Confirm zone, minimum lot size and width, and whether attached or detached is permitted as CDC.
- 02
Approval
A CDC is issued for the dwellings, and the subdivision where it applies, or a DA is lodged.
- 03
Construction
Critical-stage inspections proceed for both dwellings through the build.
- 04
Completion
Occupation Certificate, then subdivision certificate where titles are being created.
What shapes the assessment
Minimum lot size
The applicable code sets minimum lot size and width for dual occupancy in each zone. This is the first eligibility test.
Attached vs detached
The standards and fire-separation requirements differ between attached and detached forms.
Subdivision
Separate titles require a subdivision certificate, which can usually run with the development.
Neighbour notification
Dual occupancy CDCs commonly require adjoining owners to be notified, and that notification period must run before the certificate can issue.
Ready to get started?
Planning a duplex or dual occupancy?
Send the lot details and concept plans. We will confirm CDC eligibility, the subdivision position, and what the application needs.
We respond to enquiries within one business day.