Today marks a major milestone for the quake-damaged Christ Church Cathedral.

A small group of community leaders and media gathered inside the Cathedral, the first event held in the damaged building in 12 years.

Christ Church Cathedral Reinstatement chair Mark Stewart says today was a momentous day in the history of the Cathedral.

"We've had a number of events there today to show people the work we've been doing and to celebrate the fact that the stabilisation phase of the Cathedral Reinstatement is now complete."

Phase two of the reinstatement is due to begin next, with a reopening date in 2027.

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