The Office of the Official Secretary to the Governor-General (OOSGG) is a small Commonwealth budget funded statutory agency with its offices located at Government House in Canberra. The role of the OOSGG is to assist the Governor-General in performing the constitutional, statutory, ceremonial and public duties associated with the appointment. The support provided to the Governor-General by the OOSGG includes the organisation of and advice relating to, their duties, hospitality for official functions, and administration of the Australian Honours and Awards system. The OOSGG also manages and maintains the properties and associated heritage buildings and grounds, and opens the properties to members of the public for events sponsored by charitable institutions.

The OOSGG in its role as the property manager is responsible for providing a wide range of property services under the Property Works Plan (PWP) including design, construction and building/services modifications. It is also responsible for managing building maintenance, official and other transport duties, coordination with security providers and gardening functions. The official residences are Commonwealth heritage-listed and are significant national assets belonging to all Australians.

The OOSGG is seeking to establish a Panel for specific consultant disciplines (Architects, Heritage Architects, Landscape Architects, Mechanical Engineers, Electrical Engineers, Civil Engineers and Quantity Surveyors) to provide design and construction services and adhoc advice to projects and maintenance issues as required, from time to time, at the Government House and/or Admiralty House heritage properties.