Rochester Cathedral is completed during the episcopates of Ernulf (1115–1124) and John I (1125–1137).

The quire has been rearranged, the nave partly rebuilt, Gundulf's nave piers cased and the west end built.

Ernulf is also credited with building the refectory, dormitory and chapter house, only portions of which remain.

Finally Bishop John translated the body of Ithamar from the old Saxon cathedral to the new Norman one, the whole being dedicated in 1130 (or possibly 1133) by the Archbishop of Canterbury, assisted by thirteen bishops in the presence of Henry I, but the occasion is marred by a great fire which nearly destroys the whole city and damages the new cathedral.