The Chesterton Schools Network’s House system is drawn from the 1,000-year-old tradition of Christian education exemplified in the colleges at Oxford and Cambridge. The Houses provide a real, tangible community within the larger school, allowing students to take ownership, fulfill the call to leadership, and to cultivate the ideal conditions for virtue. Within the Houses, students build meaningful relationships through service projects, competitions, celebrations, and prayer.

On their first day at St. Mary's Catholic School, students are sorted into one of four Houses: Ambrose, Athanasius, Augustine, or Chrysostom. They have the opportunity to earn or lose House points through merits and demerits and remain in this House for their tenure at Chesterton. Each House has two Senior and two Junior prefects, two faculty advisors, and several parent liaisons.