DA vs CDC: What’s the Difference? (And Which One Do You Need?)
If you’re planning a renovation or new build in NSW, you’ll quickly come across two terms: DA and CDC. They sound technical and confusing, but the differences are actually quite straightforward once explained. Here’s a simple breakdown to help you understand what they mean and which approval pathway may suit your project.
What is a DA (Development Application)?
A DA is a formal approval from your local council.
It looks at your design in detail and checks that it fits the planning rules for your area.
A DA is required when:
- Your design doesn’t fully meet the “standard rules”
- Your block or home has constraints (heritage, bushfire, flood, easements, tight setbacks)
- You want a more customised or complex design
- You’re building something unusual or outside the CDC criteria
Pros of a DA:
- More flexibility in design
- Council can approve things that don’t meet strict CDC rules
- Suitable for tricky sites or bigger architectural ideas
Cons of a DA:
- Longer process (often 6–12 weeks, sometimes more)
- More documentation
- Public notification required on most projects
- Council has more discretion, which can lead to changes or conditions
What is a CDC (Complying Development Certificate)?
A CDC is a fast-track approval issued by a private certifier.
Your design must meet a very strict set of rules set by the NSW Government (not council).
A CDC is possible when:
- Your design fits every rule exactly
- Your site is not heritage-listed
- Your lot size, setbacks, heights, and building location comply perfectly
- You’re doing a straightforward renovation, extension, or new build
Pros of a CDC:
- Much faster (often 2–4 weeks)
- Private certifiers, not council
- Clear, black-and-white rules
- Less subjective assessment
Cons of a CDC:
- Very little flexibility
- If you don’t comply with one rule—just one—the certifier cannot approve it
- Not suitable for complex or constrained sites
Which approval is right for you?
Here’s the simplest way to think about it:
- If your project is straightforward and meets all the standard rules → CDC is ideal.
- If your project is custom, complex, or your site has constraints → you’ll likely need a DA.
Often, when we begin working with clients, we assess the site and design goals and let you know upfront which pathway is realistic. Sometimes we even design two options: one that fits CDC criteria and one that explores the full potential of the property under a DA.
How Residential Studio helps
We make the approval process as stress-free as possible by:
- Reviewing your site conditions
- Advising whether DA or CDC is the best path
- Preparing all drawings and reports
- Coordinating certifiers, council, engineers, and other consultants
- Managing revisions and communication so you don’t have to
Ready to start your project?
If you’re planning a renovation or new build, we’d love to help you understand your options and create a design that suits your lifestyle, your block, and your vision.
Get in touch with us at Residential Studio to book your Project Discovery Call.
Planning a new home or renovation?
email us directly ✉️ hi@residentialstudiuo.com.au
