Library redevelopment director Marg Allan said the redevelopment was running to schedule, with the library expected to be open in mid-January next year.

She said the new building was expected to increase  library visitations by more than 10 per cent.

About half a million people visit the library each year - five times more than the Bendigo Art Gallery and all of the region's swimming pools put together.

So, because of ageing facilities, the City of Greater Bendigo decided to revamp the quality asset.

"Libraries are changing and we need to build on what people want - a flexible space that can be used for so much more than just quiet reading," Ms Allan said. 

"There will be performance spaces, areas to meet and be creative for community groups, a children's cubby house, a lounge area, a display of historical artefacts, and an area with wi-fi and computer outlets."

She said the city had built what the community wanted -  a safe, accessible and affordable public building. 

"It's about community pride, but also about promoting learning and knowledge in our shire," she said.

"It's the most visited building in our shire and will become a highly flexible space that can change in coming years to meet the needs of our community."

The redevelopment will also reduce the building's carbon footprint by 14 per cent. 

"We've really tried to follow our sustainability framework, and have made some adjustments to ensure we reduce the footprint," she said. 

"There are double glazed windows, an air conditioning plant on the roof, and a concrete slab on the ceiling to cool the building overnight.

"The ceiling lining, which is the first of its kind in Australia, will also clean the air and reduce sound."

Currently, 40 to 50 people are working on site to redevelop the Hargreaves St building.