There’s a facility at https://www.onegov.nsw.gov.au/PublicRegister/#/publicregister/search/DBP which should give you a list of practitioners who might suit your requirements. The tip suggests you could search for John Smith or by licence number etc.
However, searching with words like Sydney, Building, Remedial, Architect, Waterproofer etc do not return any matches.
Has anyone had success with this search facility?