Calibre Group Ltd. engages in the provision of engineering, consulting, project delivery, construction, maintenance, and asset management services. It operates through the Professional Services, and Construction and Maintenance segments. The Professional Services segment caters to the resources, urban development, and infrastructure markets. The Construction and Maintenance segment involves in the operation of Diona business. The company was founded by Raymond Campbell Munro on April 17, 2002 and is headquartered in North Sydney, Australia.