This morning Naas Community College students joined forces with parents in a protest outside Kildare County Council offices.
Passing motorists and pedestrians showed their support for the campaign.
The students and parents chanted, 'What do we want, prefabs now!'
Concerns are mounting that the additional six prefabs required will not be available for the students by September.
Parent Séan Kelleghan speaking to KildareNow, said: "If the children don't get the prefabs, they are outside."
Parent Andrea Cullen said that the students are unable to do their sports activities due to lack of space.
She said: "It is not fit for purpose, students have to walk around in the lashing rain between buildings and outhouses. The teachers are doing a fantastic job, they are under pressure."
Her daughter, Hannah Cullen, in third year, said: "If we don't get new prefabs, we will have nowhere to go. We had to turn our PE hall into two classrooms last year, as we did not have the prefabs in time, we lost out on Physical Education."