St John's began its life when a Sunday School was started in Parkmore in late 1963. This was later extended to include worship services, which were held in a garage. In November 1970, a meeting was held where it was decided that "there should be only one church for use by all denominations".

St John's pioneered the co-operation between the churches, with the denominations committing themselves to a "Search for Unity" in late 1974 and St John's became an ecumenical church with each member church holding seperate services.

In 1998, St John's became a United Church, using a united liturgy which reflected the liturgical traditions of the Anglican, Congregational, Methodist and Presbyterian churches.

St John's is a member of the Church Unity Commission.