Here are some links to the NSW Planning Portal.
This is where you can get information that can potentially simplify things for your project.
State Environmental Planning Policies
State environmental planning policies (SEPPs) deal with issues significant to the state and people of New South Wales.
State Environmental Planning Policy (Exempt and Complying Development Codes) 2008
State Environmental Planning Policy (Exempt and Complying Codes) 2008 specifies exempt development (development that does not require approval) under that policy.
For further information please email firstname.lastname@example.org or call the Department of Planning's Information Centre on 02 9228 6333.