Work to move the thousands of books began on Monday
Teams are due to begin moving around 100,000 books and other items from a library to a temporary location while the building is refurbished.
The work to revamp Wrexham Library will begin in the autumn and take around six months. It will be funded by a £310,000 Welsh Assembly Government grant.
The temporary library at the former Kwiksave building on Chester Street will open on 5 October.
The library and family information service will be closed for two weeks.
Throughout the fortnight, customers can return books to the library but will not be able to take any out.
The refurbishment will include a first-floor extension to improve study and learning facilities.
A lift for improved disabled access will also be built and wi-fi will be installed.
The stock of books, DVDs and other resources will be refreshed and self-service check out stations will be built.
Councillor Bob Dutton, deputy leader of Wrexham council, said the refurbishment would offer users an expanded range of services and resources.
"The opportunity to refurbish our main library is one not to be missed and a temporary closure is inevitable," he said.
"However, the council also recognizes that it is essential to maintain a library and information service in the town centre during the refurbishment and I am pleased that we are able to continue to provide the valued and appreciated service that local people enjoy at Wrexham Library."