You can apply for a CDC at two stages
You can apply for the CDC at two stages, either before (certified) or after (uncertified) you submit your building permit application.
1. Before applying for a building permit (Certified CDC application)
This is where a registered building surveyor certifies that your proposed designs comply with the relevant statutory requirements and issue the CDC before you lodge a building permit application
2. After applying for a building permit (Uncertified CDC application)
Here your authority certifies the designs after you’ve submitted a building permit application.