The pink shutters finally lifted on Tuesday to unveil Basingstoke's new Discovery Centre in Festival Place.
Since closing in April, Basingstoke library has received a £1.2m revamp to transform its interior.
The new library is the third Discovery Centre in the county, joining Winchester and Gosport.
Mayor of Basingstoke and Deane Keith Chapman joined Hampshire County Council leader Ken Thornber to cut the ribbon, declaring the library open for business.
Cllr Thornber said: “I think the new centre is a magnificent transformation from what it was just a year ago.
“I hope and think the people of Basingstoke will agree and give the library their full support.”
The one million pound investment from Hampshire contributed to the addition of 30,000 new titles, self-service stations and computers with free internet access.
Basingstoke council contributed over £52,000 to build a sound-proofed community room.
Eli Lilly also donated £26,000 for a business and learning suite.
Cllr Thornber added: “In a time of austerity, we should celebrate a project like this.
“For me and the people of the borough, this centre is part of their wellbeing and is incredibly important in times of great difficulty.”
Before shutting its doors seven months ago, Basingstoke library was the county's second busiest library.
At the opening, ambassador for Basingstoke 15-year-old Liam Dawett said: “I think the library is a massive improvement over what was there before.
“Most importantly, the place gives youngsters an area they can come to study in, do their course work and get on with their homework. It should definitely get youngsters into a library.”
A central feature of the renovation is the first-floor area for adults with learning disabilities, known as the Yellow Space.
Funded by a £41,000 donation from the Big Lottery Fund, the area stocks specialist titles not commercially available providing advice and help.
Visiting the dedicated space was 23-year-old Louis McCombie from Oakley and his full-time carer, Mary Traynor.
Ms Traynor said: “It is good to have our own area. Sometimes people with disabilities can feel nervous and conscious of people looking at them.”
The pair visit libraries once a week.
Ms Traynor added: “For Louis, coming to the library is a very big part of his life.
“He loves it and finally having a place designed for him is very important and a big step forward.”
