CDC vs DA: What’s the Difference When Building a Granny Flat?
If you’re thinking about building a granny flat, there’s a lot to get excited about—from extra space and rental income to adding value to your property. But before you can start building, you’ll need the right approvals in place.
Understanding the difference between a Complying Development Certificate (CDC) and a Development Application (DA) is a key step in the planning process. Here’s a quick guide to help you choose the right path forward.
What is a CDC?
A Complying Development Certificate (CDC) is a fast-tracked approval process that combines both planning and construction approval. It’s designed for straightforward projects that meet specific criteria set by the NSW government.
If your site and proposed granny flat meet these requirements, a CDC is usually the quickest and simplest option. Best of all, it can be handled by a private certifier—meaning you don’t need to go through council.
What is a DA?
A Development Application (DA) is a more traditional approval process managed by your local council. It involves a formal assessment of your plans against council guidelines, including things like setbacks, streetscape, and environmental impact.
Even if your proposed design doesn’t meet all guidelines, councils may still grant approval if the overall proposal is considered reasonable—offering more flexibility than a CDC in some cases.
How Much Does a CDC or DA Cost?
CDC costs:
The cost of a CDC varies based on the complexity of your build and the certifier’s fees. On average, you can expect to pay around $2,500 to $3,500 for the application.
DA costs:
Development Application costs can vary widely, typically ranging from $2,000 to $9,000, depending on council fees, consultant reports, and any required adjustments to your plans.
Keep in mind that both paths will also require a Construction Certificate before work begins, which carries its own fees.
How Long Does the Approval Process Take?
CDC timeline:
If your block is straightforward and all required documents (like surveys and drawings) are ready, approval can be obtained in as little as 4 to 8 weeks.
DA timeline:
A DA takes significantly longer—usually 4 to 6 months, depending on your council’s workload. It can take even longer if there are objections or requests for amendments.
Pros and Cons of a CDC
Pros:
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Faster and simpler than a DA
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Can be approved by a private certifier
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Suitable for straightforward sites
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Can sometimes be lodged before land registration
Cons:
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Strict requirements with little flexibility
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No room for interpretation—non-compliant designs won’t be approved
Pros and Cons of a DA
Pros:
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Councils may approve designs that fall outside CDC guidelines
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Greater design flexibility in some areas
Cons:
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Slower processing time (up to six months or more)
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More complex and often requires more documentation
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Council response times can vary significantly
So, Which Option is Right for You?
If your site meets the CDC requirements, that’s usually the best path—faster, simpler, and often cheaper. But if your land isn’t eligible for a CDC, don’t be discouraged. A DA might take longer, but it can still get you to the finish line.
At Acrow Granny Flats, we work with both approval pathways and guide you through the process from start to finish. Whether it’s a quick CDC or a more complex DA, our experienced team knows how to navigate the regulations—and get your granny flat built.
Thinking of building a granny flat? Get in touch today and let’s talk about what’s possible on your property