With growing momentum, it was resolved in December of that year to purchase 10.1 hectares (twenty-five acres) of vineyards from the South Australian Housing Trust at Marion.

At the inaugural fundraising dinner on 9 June 1959, 160 men volunteered to solicit 3000 prospective contributors to achieve a target of $200,000 for the first building phase.

At the first assembly, broadcast on radio station 5KA, the Headmaster's opening address began with the words, "Let the life of the school begin".

The move to become coeducational in 1978 arguably provided a catalyst in transforming Westminster from an institution that had been formed in the shadow of Prince Alfred College, to the significant entity which it now is in its own right.

[4] The Cloisters, between the 100 and 200 blocks involved the creation of wide arched verandahs, a brick staircase, fountain and lawn area.

Originally based at Clayton on the shore of Lake Alexandrina, the school initially ran the programme in conjunction with Outward Bound.

[8] The school owns an additional 68-hectare property at Point Sturt, giving direct access to the lower Murray River.

Alan Green was the first full-time chaplain, serving from 1964 to 1976 and was succeeded by David Purling, Dean Davidson, Patrick Gillespie and currently Phil Hoffmann.