St John's Pro-Cathedral, Perth

St John's Pro-Cathedral is the earliest Roman Catholic church building in Western Australia.

The pro-cathedral of St John the Evangelist is an important building in the history of the Catholic Church in Western Australia. It was the first Catholic Church and would become the first Cathedral. It was the centre of Catholic life for the first twenty years of the Catholic Church in the Swan River Colony until the first St Mary’s Cathedral was completed in 1865.

The Cathedral is constructed of brick that has been covered with lime render and painted ochre to resemble the colour of the original building. The gable roof is covered with shingles. The north and south facades are punctuated by arched windows. Buttresses have been placed at regular intervals down the length of these facades. The portico, which was removed in 1881, has been reconstructed at the western end of the building.

The western gable end is punctuated by four arched windows, a pair above the portico and a single window either side of the portico. A lean-to extension is located at the eastern end of the southern facade. Entry to this section is through an arched door on the north facade. The church windows have clear glass set in wooden mullions. Those in the lean-to section are square, four paned windows.