If you need to make changes to an approved DA you will need to lodge an application under Section 96 of the Environmental Planning and Assessment Act.
There are different section 96 applications, depending on the nature and complexity of the changes being sought, however the application to 'modify a consent' (S96) is used for them all. There is an application fee payable at the time of lodgement.
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Your approval has come through, however this is often just the first steps. Outlined within your determination notice will be requirements for how to carry out your development. It is important to understand that you may have further approvals to obtain before starting work and that any work is carried out in accordance with the conditions set out in your determination notice. If your proposal includes building or construction work, you'll need to obtain a Construction Certificate.