DA, CDC & subdivision-aware design
Duplex & Dual Occupancy Design Sydney
Duplex feasibility is decided by more than lot width. AusJu considers zoning, frontage, site area, access, trees, drainage, parking, private open space, built form and the intended title or subdivision strategy before design is advanced.
For homeowners, builders and small developers assessing attached or detached dual occupancy opportunities.
Send us your duplex site for review →Start with development feasibility
We review the planning pathway and major site constraints before committing to a detailed design.
Design two good homes
Each dwelling needs privacy, daylight, functional circulation, useful outdoor space and a coherent street presence.
Coordinate the technical team
Survey, stormwater, BASIX, landscape, engineering and other required inputs are integrated into the submission.
Keep construction in view
Efficient structure, services, levels and buildability are considered as the design develops.
Typical scope
One coordinated path from feasibility to construction.
- Duplex feasibility review
- Concept design and yield testing
- DA or eligible CDC documentation
- Consultant and certifier coordination
- Construction documentation and design changes
Relevant experience
Real projects behind the service.
North Ryde Duplex
Two attached four-bedroom homes on an approximately 815.5 m² site, with multiple living areas, garages and private outdoor space.
View project →FAQ
Common questions
Is lot frontage alone enough to confirm a duplex?+
No. Frontage is only one control. Zoning, site area, access, constraints and all applicable standards must be checked.
Is duplex design suitable for an investor or extended family?+
It can support different objectives, including two family households, living in one dwelling while retaining the other, or a development strategy. Planning, title, finance, tax, sales and rental outcomes require advice from the relevant specialists.
What affects duplex design and approval costs?+
Site survey quality, slope, trees, drainage, demolition, access, planning controls, approval pathway, subdivision strategy and consultant requirements all influence scope. We provide a staged proposal after reviewing the site.
How long does a duplex project take to design and approve?+
The programme depends on feasibility, client decisions, survey and consultant inputs, and whether the proposal follows DA or an eligible CDC pathway. We outline project stages after the initial review but do not guarantee authority assessment timeframes.
Can AusJu assist with Torrens subdivision?+
We can coordinate the design and relevant consultant inputs, while subdivision advice and specialist work are confirmed for the individual project.
Free initial project consultation
Start with clarity before committing to the next step.
Speak directly with an experienced building designer about your project, likely approval pathway and next steps. Following an initial review, a complimentary site consultation may be available for suitable projects.
- 01Send the essentials
Provide the property address or suburb, project type, current site situation, target timeframe, photos, and any available survey or existing plans.
- 02Free initial call
A short call to discuss your objectives, key constraints and likely approval pathway.
- 03Site consultation where suitable
Suitable, clearly defined projects within our service area may be offered a complimentary 30–45 minute site consultation.
Please note: A complimentary site consultation is preliminary and subject to project type, location and availability. It does not include a measured survey, existing-condition drawings, design work, written advice or a detailed feasibility report. Any formal measuring or documentation will be quoted before work begins.