The timeframe for getting a planning approval/development permit is largely dependent on the type of development and required assessment level (Exempt, Self, Code or impact). Other factors to consider include the complexity of the proposal, with regards to recognizing; if any referral agency involvement is required, if public notification is required, and if there are any ways to utilize a fast track assessment process.
After establishing what processes are involved the timeframes for assessment of a development application, following lodgment with the relevant assessment manager, such as local council, are subject to those assessment processes and timeframes stipulated in the Sustainable Planning Act 2009.