Four new classrooms will be among the development's additions.
A midlands secondary school has been given initial approval for a modular extension.
The Minister for Education, Norma Foley, confirmed the news for Portlaoise College.
The extension will see the addition of four new classrooms, a new science lab and an engineering room.
The Laois Offaly Education and Training Board have developed the proposal and will continue to see it through.
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