A new £9million building at University Academy Holbeach means more places can be offered to students.
Partial completion of the new building has given students a modern learning environment.
It has been delivered by national contractors Shepherd Construction and Shepherd Engineering Services (SES), with the University of Lincoln as lead sponsor.
Completion of phase two, which incorporates demolition, further remodelling and landscaping of the site, is expected to be in April next year.
Works at University Academy Holbeach began in August last year and provides 3,500m² of teaching space, including for the first time a purpose-built sports hall and specialist design and technology and art facilities, along with standard classrooms.
The new facilities have been constructed to replace the original 1950s buildings, which are outdated.
They will allow the academy, which has been oversubscribed since it opened, to offer an additional 20 places per year group.
Chris Penney, chairman of governors, said the new building is part of an essential long-term investment to ensure the future success of the academy.
He said: “It is over two years since Shepherd was appointed to design and build our new building and throughout that time both they and their design team have worked with us to provide these wonderful state-of-the-art facilities. I would also pay tribute to our own staff who have had to operate from within a building site for over a year.”