Council meetings were last held there in 2022 and there have since been investigations about the building’s structural integrity and what is needed for restoration of the exterior.
Property services group manager Anna Nilsen said the council was not yet able to confirm costs or an expected timeline.
Two streams of work were under way on the Town Hall and Municipal Chambers complex — one was the exterior heritage restoration project and the other involved seismic investigation and strengthening work.
"Alongside the restoration project, staff have been working with structural engineers to develop a detailed seismic assessment of the complex," Ms Nilsen said.
"Once we have a better understanding of what strengthening work might be needed and the potential costs, council will then decide on how to proceed with the project."
The exterior project involves restoration of stonework, lead and copper flashings, timber repairs and paintwork, likely to take until at least 2028.
The council included $14 million in its 2025-34 long-term plan for what was labelled Municipal Chambers restoration.
Ms Nilsen said this would go towards heritage restoration work and to "continue consultation work with heritage and engineering experts, and determine options for potential strengthening work".
