A $17m redevelopment of the University of Otago's commerce building is getting under way.
The university finally decided to fix the building last October, following almost 100 complaints.
At least a dozen people have been seriously injured as a result of accidents in the building's atrium.
Work making the 25-year-old facility safer is expected to take a year.
The current roof, which isn't watertight, will be replaced.
More modern learning environments will also be developed.
Some classes are being relocated but staff will remain in the building throughout.