 In 1927 , the Afrikaner majority Parliament of South Africa passed the Union Nationality & Flag Act , which stated that the Union Jack and the new Flag of the Union of South Africa were to have equal status as the flag of South Africa . The act came into force in 1928 when both flags were raised over the Houses of Parliament , Cape Town and the Union Buildings in Pretoria This dual status was ended in 1957 with the passing of the Flags Amendment Act which declared that the Oranje , Blanje , Blou would be the sole flag of South Africa with the act also declaring that Die Stem van Suid @-@ Afrika would be the country 's sole anthem and dropping God Save the Queen . 
