Hot-rolled steel windows became popular throughout the world from the 1890s onwards, until being superseded by extruded aluminium windows in the years after the Second World War.
The forerunners of steel windows were cast-metal framed windows. From the mid 18th century, these were in fairly widespread use in England, although still relatively rare in Australia.
Cast-metal windows [usually iron, but sometimes copper or other metals] came about with the advent of a more accurate casting method in the mid 18th century in England. As a result a comprehensive selection of window types and styles soon became available. Due to their "fire resistance", improved security and choice of designs (usually based upon timber framed models), they were used for housing, factories and government buildings. By 1833, their acceptability had grown to such an extent that Loudon in his Encyclopaedia extolled: “Windows of cast iron, are very fit for cottages and are now made of different forms and very cheap”