While in lockdown, the project team was able to keep working remotely.
Once lockdown restrictions are lifted, on-site workers will establish a construction site and then focus on stabilisation work.
Project staff are focusing on "detailed engineering for stabilisation structures", approvals, and construction planning while alert level three is in place.
Christ Church Cathedral Reinstatement Limited project director, Keith Paterson, said it was disappointing physical work could not get under way.
"These work-stream adaptations will help ensure a quick on-site start when allowed," Paterson said.
The stabilisation phase in the overall restoration will take up to two years to finish and will cost $11.8 million.
Project staff will work on the south transept first as this will give workers safe and fast access to the building.
"Once stabilised we will be able to retrieve heritage items and gather additional information on the condition of the building," Paterson said.
Christ Church Cathedral restoration is being funded by a $10 million Crown cash contribution, a $10m Council grant, and a $15m loan from the Government.