The Rt Rev Dr Steven Benford was installed as Bishop of Dunedin in September last year.
St John's Church was built in 1858 through the leadership and financial support of whaler and early Dunedin businessman Johnny Jones.
Dr Benford blessed additions to the parish hall kitchen after the service.
The service was attended by members of St John's parish, St Mary's Church in Palmerston, and the Waikouaiti Presbyterian parish.