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While handing over the property the developer also needs to give you a completion certificate. If the agreement of the granny flat in Sydney does not mention the completion certificate make sure that there is a clause which implies that the developer would provide you a completion certificate while handing over the property.
http://custombuiltgrannyflats.postbit.com/are-you-about-to-sign-an-agreement-with-builders-points-to-check.html