Sited on a prominent ridge in Parnell, on land bought by Bishop Selwyn in 1843 the Cathedral is a fascinating blend of two totally different styles. The neo-Gothic Chancel, a brick-clad reinforced concrete structure, has the traditional style and feel of an older Cathedral. Inside the Chancel beneath the organ console the Marsden Chapel provides a peaceful haven-within-a-haven. The Chancel also has many magnificent windows, including those by retired English artist John Baker that he considers the best of his long career.

The nave is spectacular, providing both a wide area for worship, and a venue for community and arts events. Having some similarity to a South Pacific meetinghouse, doors along both sides make the pillar-less ceiling seem to float in the air. This feeling is further enhanced by the absence of supporting pillars. The folds in the roof are part of the supporting system. Contained within the Cathedral precinct is the beautiful and historic St Mary's, former Cathedral Church of the Diocese.