The current facility will see it's capacity increased to 1,300.
Plans have been approved for a major new midlands secondary school.
The Board of Management at Coláiste Íosagáin in Portarlington has been given the green light for a new two and three-storey post-primary school.
The new facility will have the ability to cater for up to 1,300 students, an increase on the existing capacity of 1,140.
The building would replace the existing school, and the plans include the demolition of the current premises, as well as a number of temporary buildings.
As the proposed development will be built on the existing GAA pitch, it also includes plans to construct a new pitch on the site.
Overall, the plans will see the new school feature 48 general classrooms, 24 specialist teaching rooms and four special needs classrooms, as well as a range of other facilities, including a library and P.E hall.
Offaly County Council granted planning permission for the development, subject to 14 conditions.