The narrow streets of the Marolles are full with kids. Their paradise is a wasteland. One day, the wasteland is barricaded, disembowelled by machines, while the surrounding houses are pulled down. The amazement of the kids soon turns into revolt: they choose a leader, manufacture catapults with the shoulder straps of their parents and decide to start a war against the entrepreneurs and architects...

Le chantier des gosses takes us on a journey into their universe. The kids (the youngest is 2 years and a half, the oldest 14) are the main actors, playing their role with a lot of spontaneity and a great deal of improvisation.