DA vs CDC: Which Approval Path Is Right for Your KDR?

When you're planning a knockdown rebuild, one of the first questions your town planner will ask is: "Are you going DA or CDC?" The answer will shape your entire project timeline, your design flexibility, and your budget. Here's what you need to know.

What is a DA (Development Application)?

A DA is a formal application to your local council requesting approval to carry out development. It involves a full assessment of your proposed design against the local planning instruments — the Local Environmental Plan (LEP) and Development Control Plan (DCP).

Key characteristics of DA:

• Assessed by your local council
• Can accommodate design variations and requests for flexibility
• Public notification period required (usually 14–28 days)
• Typical timeline: 3–12 months depending on council workload and complexity
• Suitable for heritage properties, flood-affected land, or non-standard designs

What is a CDC (Complying Development Certificate)?

CDC is a streamlined approval pathway for developments that comply with a set of pre-determined standards. If your project meets all the rules, a council or a registered certifier can issue a CDC, without the merit assessment a DA goes through.

Key characteristics of CDC:

• Assessed by a council or a registered (accredited) certifier
• No public exhibition and no submissions, but adjoining neighbours are still notified in many cases: once before the certificate is determined, and again before work starts
• Typical timeline: 4–8 weeks
• Faster, cheaper, and more predictable
• Design must strictly comply — no variations allowed

How to choose?

CDC works well when your block is straightforward: no heritage, no flood zone, compliant setbacks, standard height and floor space ratio. DA is necessary when you want a design that pushes the boundaries, or when your property has overlays that exclude it from CDC.

Before committing to either path, have a pre-lodgement meeting with your council or a town planner. This 30-minute conversation can save you months of rework.

Common Myths

Myth: CDC is always better. Not true. CDC can be more limiting if your design needs to flex, or if your block is oddly shaped.

Myth: DA always takes years. Many councils now have fast-track pathways for straightforward residential DAs, with decisions in 8–12 weeks.

Bottom Line

Run a feasibility check on your suburb using our AI tool — it will tell you whether CDC is likely available for your block, and estimate DA timelines based on your council's current workload.