The building included a nave with a south porch and a transeptal south chapel. It is located in a north transeptal position, frequent in early North Devon churches. The asymmetrical placed transeptal tower stump is covered with a saddleback roof. On the north and south sides of the chapel are two transeptal, semi-octagonal bays. St. John's has a transeptal south chapel and a central belltower over the crossing.