The approval will generally lapse, if the development and/or land use has not been completed or substantially commenced within two years of the date of the approval.
In relation to a dwelling, substantially commenced means the slab has been laid and brickwork is up to plate height.
Development approval also runs with the land. For example, if a landowner was granted approval for a patio but didn’t build it before selling the house, the new owner can construct the patio as per the approved plans provided it is within the expiry date of the approval.