CDC or DA?
Before a single wall is built, every project in New South Wales has to clear one hurdle: approval. And there are two very different doors you can walk through to get there. Choosing the right one at the start can save you months. Choosing the wrong one can cost you far more than time.
The two pathways are a Complying Development Certificate, almost always called a CDC, and a Development Application, known as a DA. They lead to the same place, the right to build, but they get there in completely different ways. Understanding the difference is one of the most useful things you can do before committing to a design.
What a CDC actually is
A CDC is a fast-track approval. If your project meets a clear set of pre-defined rules, it can be approved by a private certifier or council without going through a full council assessment. No neighbour notification, no lengthy public process, and often a decision in weeks rather than months.
The catch is that a CDC is strict. Your project has to tick every box. Setbacks, height, floor space, site coverage, landscaping, and a long list of other controls all have to fall within the allowable limits. Miss one, and you no longer qualify. There is no partial CDC, and no room to negotiate.
What a DA actually is
A DA is the traditional pathway. Your application goes to council, who assess it against the planning controls and merit of the proposal. It allows far more flexibility, including designs that step outside the strict CDC limits, but that flexibility comes at a price: time, cost, neighbour notification, and the possibility of conditions or refusal.
A DA is not a worse option. For many projects it is the only option, and for some it is genuinely the better one. But it is a different process with a different rhythm, and you need to know which one you are in before you start designing.
Why the choice has to come first
Here is where projects go wrong. People fall in love with a design, then discover it cannot be approved the fast way, and have to either redesign or commit to the slower DA path they never planned for. The pathway should shape the design, not the other way around.
If a CDC is achievable and a fast, predictable approval matters to you, the design should be drawn to stay within those rules from the very first sketch. If your site or your ambitions require a DA, then the design can take advantage of that flexibility, but you go in knowing the timeline and the process ahead of you.
How to know which one fits
The honest answer is that it depends on your site and what you want to build, which is exactly why it is worth checking early. The zoning of your land, its dimensions, the controls that apply in your area, and the scale of what you are planning all feed into whether a CDC is realistic or a DA is required.
This is the kind of question worth resolving before you spend money on a full design. Getting clarity on your approval pathway at the start means your design is built around a route to approval that actually works, rather than discovering a problem once the drawings are already done.
Work with us
Have a project where this matters?
If you want a design that is built to work, not just built to look good, start with a conversation. No obligation, no sales script.
Get the Design Journal
New articles on buildable design, approvals, and getting your project right — straight to your inbox.