The new vestries will replace the 1960s versions, which have been demolished to enable access to repair the apse at the east end, one of the oldest parts of the Cathedral.
They will be built in the same palate of materials as the cathedral itself, matching the Cathedral's roof form.
The north vestry is proposed as a library and first-class rehearsal space for the Cathedral choirs. It could also be used for other meetings, education or community activities. It can function separately from the Cathedral via separate access.
The south vestry will provide space for clergy, vergers and servers to assemble and robe before services, with the first floor reserved as the plant room.