 From 1970 until his election to State parliament he was a grazier at Salisbury Downs, a property near Bigga.Webster represented Goulburn for the National Party in the NSW Legislative Assembly from March 1984 until May 1991 when he was elected as a member of the Legislative Council where he served until retiring from politics in 1995.During his parliamentary career he served as Minister for Administrative Services and Assistant Minister for Transport, Minister for Family and Community Services and Minister for Administrative Services, Minister for Planning, Minister for Energy, Minister for State Development and Minister for Tourism, and finally as Minister for Planning and Minister for Housing.