The introduction of new development reforms to create more affordable housing and investment opportunities across NSW has renewed interest in secondary dwellings, commonly known as granny flats. You will require building approval for your secondary dwelling project where there are two ways to gain this approval. You can lodge a full Development Application (DA) with your local council which is a process that can generally take a number of months. A Construction Certificate (CC) can then be issued by Council or a Private Certifier before construction can commence.