Stop guessing. Answer a few questions about the works and the site and find out whether you need a planning permit, a building permit, or both, in plain English.
Planning vs building permit, driven by the works and the overlays.
Pull the zone and overlays before you quote or start.
Understand the conditions that apply to your job.
Start with one address, free. No card, no consultant, no 1,000-page scheme. Just the answer.