Work is due to start to repair a section of the town hall roof on Monday August 17.
The roof improvements come ahead of a wider refurbishment planned for the Albert Halls.
Scaffolding and hoardings will go up around the north and east sides of the town hall, to allow contractors from Wilmott Dixon to carry out repairs and replacement of sections of the roof over the Albert Halls.
Some parts of the roof are more than 30 years old but the majority of the roof is much older and needs urgent work to improve it to prevent leaks and further damage.
Contractors will be replacing slate tiles, gutters, and most of the old rainwater drain pipes. They will also repoint stonework around the roof and higher levels of the town hall.
Internally, the contractors will be carrying out structural and technical surveys, to plan for the later phases of refurbishment.
The contractors will also be working around the peregrine falcons’ activity, so as not to disturb the birds at critical times. The roof work should take around six months to complete.
Leader of Bolton Council, Councillor Cliff Morris, said: “These roof and stonework repairs are essential as part of our ongoing maintenance of the Albert Halls’ side of the building. The work will help maintain the building for many more years to come.”