Hello John
Good luck with your project.
I am in Bathurst and built a 3m dome 4 years ago, I didn't tell council for a number of reasons. All my neighbours were fine with it( I saw them first and was on good terms with them all ) one moved and the new one is a dick head lights on a verandah directed at the obs. I'm not sure why but the world is full of dick heads now.
The other reasons were my view of council gained as a working builder over 40 years is all they are interested in is $$$, approval would be given once it was built. the second other reason was I thought it came under a " Complying Deveopment )
https://www.planning.nsw.gov.au/Asse...ng-development
Copy and paste from https and have a look.
Hope this helps.
Ed