 At the University of Sydney, Blacket built the Anglican St. Paul's College and supervised the building of the Catholic College of St John's after the resignation of its designer William Wardell.Insofar as the building was completed, he was faithful to Wardell's design, but he omitted several features, such as the western cloister, for lack of funds.In 1881, Blacket designed the Clarke Buildings of Trinity College, a residential college affiliated with the University of Melbourne.