I’m an Australian based Building Designer and BIM Manager who currently works in the Architectural industry. I'm able to produce the appropriate documentation to issue for Development Approval with your local council authority.
If you're after a Granny Flat as per the image attached i can definitely deliver the appropriate drawings required.
Please see my profile for reviews and some of my recent work (happy to provide more if you require).
Please don't hesitate to ask if you require further information.