The contractor began to restore the 1930's building in Charles Street last year.
In addition to the sensitive restoration of original Art Deco features, the firm has also created new committee and function rooms to allow the city council to hire out spaces at the venue for weddings and functions.
Nick Heath, operations director at Willmott Dixon in the East Midlands, said: "This was a really interesting project for us to be involved in as it involved the restoration of a historic building, but also the provision of office accommodation appropriate for the modern age.
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"As part of the works we have undertaken, we have managed to create areas of civic space in addition to the council offices which opens up the building to the people of Leicester.
"Not only that but, following the closure of the council's New Walk Centre, some 400 staff members have been working in the building since the summer, which presents unique challenges in and of itself as we have continued to work on the lower floors."
Renovations included the transformation of the old rates hall, where residents used to pay their taxes, into a function room which can be hired by members of the public, as well as the revamping of an auditorium and conference rooms.
(CD/JP)
