[1] The church (building) is located in Paolo VI Square, adjacent to corso Matteotti which divides the town of Castellanza in two parts.

On 2 February 1924, the priest Testori sent an invitation to a meeting to all the wealthy people of the town in order to exchange opinions about the future of the church.

The people present for this discussion included: Giacomo Binda Sindaco, Ettorino and Egidio Pomini, Carlo Cerini, Pietro Soldini, Ambrogio Bonacina, Tito Burgis, Gabrio Pendolini Piola, Natale Colombo, the brothers Colombo Bolla, and all the priests of the town.

The foundation stone of the existing church of San Giulio was placed by Mr. Roberto Colombo on 8 August 1926.

[2]: 106–107  Palio di Castellanza serves as a celebration of the town’s religious history, with particular attention to the Church of San Giulio.

The festival’s recognition of San Giulio, along with other historical elements, highlights the deep-rooted faith of Castellanza.

Church San Giulio has a Romanesque Revival and Lombard architectural style, and its front side faces the main square of the town of Castellanza.

[2] The key features of the north Italian Lombard Romanesque architectural style are brick and flat and wide facades covering the whole front of the church, often with a big rose window in the middle, above the entrance.

The new facade was designed by engineer Maggi and was decorated with many rose windows.The walls of the transepts are colorfully adorned.

The ciborium was built in Byzantine style by the architect Giovanni Maggi and the sculptor Giannino Castiglioni in 1932.