The 100-year-old Warkworth Town Hall needs about $3 million to keep its doors open, the council says.
The "community treasure" will close in the new year while the Auckland Council investigates options to strengthen and future-proof the category 1 heritage building.
Preliminary estimates have put the bill at about $3 million to fix the problems plaguing the building at the corner of Neville and Alnwick Sts.
Since 2005 the hall has been limited to just 99 visitors at a time.
Auckland Council's building policy manager, Bob de Leur, is among the team of council specialists assembled to look into how the building might be upgraded to meet Building Code requirements and future demands.