Designed by architect Emilio Doyére, the building stands out at first sight for its single central tower, located in the entrance porch, which does away with the continuity of height of adjacent constructions. The church has a Neo-Gothic style, where pointed arches both inside and outside proliferate. In the central niche, ending up in a pointed arch and crowning the main door, there is a sculpture set representing Jesus, as a shepherd, entrusting Saint Peter the mission of leading the new Church, to whom the temple is devoted. On both sides of the door, there are niches containing sculptures associated to the congregation, as well as the consecration of Saint Peter. A hexagonal bell tower finishes the ensemble, which is crowned with a square-based spire.

Inside, the church has a short Latin cross-shaped layout, divided into three naves, being the central the highest, and divided by three pointed arches resting on profusely decorated columns with carved capitals. It has entrances on both sides of the temple, due to the fact that students accessed via the south door, and nuns made their entrance via the north door. The three naves are crowned with a quadripartite rib vaulted ceiling, entirely ribbed and decorated.

Central nave is divided into two levels: the first one connects to lateral naves, and the second one is decorated with beautiful imported stained glass windows. This nave ends up in an apse where the main central altar is located. Altar is crowned and illuminated by a set of three stained glass windows on the back wall. Each set is accompanied by two large paintings, one on each side.