Rossdoor has been operating as a family business in Melbourne since 1978. In August 2008 Rossdoor became part of the Steel–Line Group of companies. Steel-Line is a leading manufacturer and distributor of Garage Doors and Mirage Doors in Australia with over 20 branches and 200 resellers. Steel-Line manufactures and supplies sectional doors, roller doors, tilt doors and custom timber doors and are able to service and repair all garage doors and garage door operators. The Steel–Line Group will continue to evolve in order to become a single source for design, manufacture, installation and after–sales service of residential, commercial and industrial door systems throughout Australia.