The below ground expansion will create space for library archives, a reading room and a 150 seat gallery for library programs.
The historic 15,000 square foot building didn't have the capacity to hold art and history exhibits and other business gatherings, but the library's board says the expansion is a step in the right direction.
"It just takes the library into the next century," said Board of Trustee President Ward Peyronnin, "and it allows us to showcase all the wonderful items and books and material that we have in the library."
Willard Library is the oldest public library building in the state of Indiana. The $2.4 million undertaking is expected to be complete by the end of 2014.