You will need this certificate if you intend to occupy a building after it has been constructed or altered. The purpose of this certificate is to demonstrate that the building wholly or substantially meets all relevant standards and is safe to be occupied.
The building may need to be certified by a licensed building surveyor (or principal building surveyor if the building is over three storeys or 2000 square metres). Once work on your building has been competed to the satisfaction of your building certifier, they will issue you with a certificate of completion.