Whilst membership of the BDAV is voluntarily – members choose to belong to a professional body, but there is no legislative requirement for them to belong to the BDAV – it is wise to validate that your chosen building designer is registered with the Victorian Building Authority before embarking on your project. Visit the VBA's website, at www.vba.vic.gov.au and go to the section "Find a Practitioner". [An RBP is a Registered Building Practitioner.]. The search process there is quite straightforward. Or phone the VBA on 1300 815 127.