The library in Harborough is set to close for up to 12 weeks while Harborough District Council moves back into its revamped headquarters building.
The council has prepared a draft schedule of dates when councillors, staff and key services will move back into The Symington Building in Adam and Eve Street, which is being transformed in a £5.75m project.
It shows that contractors Willmott Dixon are hoping to hand over the building to the council on December 20.
Customer services will close at the council’s temporary home at Miller’s House on January 24 and re-open at the Symington Building on January 27.
The library will close on February 8 and re-open in its new home on the first floor of the new-look building on April 7.
The council expects to have completely vacated Miller’s House by March 7, with meetings beginning at the new council chamber by April 1.
A council spokesman said: “We have carefully planned the move back into the building to ensure this is carried out as efficiently as possible and that there will be as little disruption for the public as possible during this period.”