Work has begun to rebuild Portway Community School in Bristol under a Private Finance Initiative (PFI).
The new premises will be built next to the existing school. The old school will remain open during the work.
The secondary school is one of four which are to be rebuilt under a £120m scheme. They will all open during 2006.
Work at Henbury school has already started. Bedminster Down and Monks Park schools will also be rebuilt over the next two years.
Portway Community School has also appointed a new head teacher, Steve Davies has joined the school from Caerphilly.
He said: "I was attracted to this school in part, by the PFI build. The buildings at the moment aren't very nice - there are leaky roofs and it's not easy to keep clean.
"The small classrooms will be replaced with state-of-the-art buildings, which is good for staff and pupils."
Elaine Miller, business manager at Portway School, told the BBC: "The original Portway school is made up of several buildings: students move between them and get wet when it rains."
The new school will be all in one building and includes an autistic block and a gym with viewing gallery.
While the rebuild is taking place the school will use a local football team and cricket team's pitches for sport activities.