The church is constructed of brick, stone and wood. There is no steel or concrete in the structure. It is in the Romanesque style in which the features are its towers, rounded arches, column, and windows.

The exterior is brick with a double rounded arch entrance, flanked by two towers, and surmounted by a large "rose" window. The exterior features are delineated by natural stone on the foundation, windows and doors. The towers are of uneven heights. They symbolize Adam and Eve. Just as all humanity came into being through them, Christ's redemption came through them in his human nature, and the church is entered through them. The west tower contains a stairway to the loft area. The east tower contains the bell from 1886.

In the interior, the central aisle is crowned by the rounded arches of barrel vaulting which originally ended in a half dome behind the altar. The central aisle is flanked by columns with corinthian capitals which support the central barrel vault and the ribbed vaulting on the side aisles, which in turn is supported by buttress columns on the outside of the church. It is this column and buttress support that absorbs the weight of the building and allows large openings in the wall for the stained glass window.

The stained glass windows were imported from Germany and are of exceptionally fine quality and brilliant color. The original purpose of decoration in a church was to teach the life of Christ and theological concepts through illustration when so few people could read. The windows on the newest wall illustrate events from the life of Christ. The windows on the east wall are saints what reflect the ethnic make-up of the early settlers, i.e. Irish, German, and Polish. The are: St. Patrick, St. Brigid, St. Columban, St. Boniface, St. Elizabeth and St. Stanislaus. St. Stanislaus is also a remembrance of the contribution of the Jesuits in the building of St. Mary's Academy. There are two small round windows that were formerly over the confessionals and they depict Christ as "Ecce Homo" crowned with thorns and Mary as a sorrowful mother - both representations of the pain of sin. High over the altar are two windows that depict sin. High over the altar are two windows that depict parenthood - on the west is St. Ann with Mary as a child and on the east is Joseph with Christ as a child. Looking back to the front of the church is the "rose" window. The central figure is the Sacred Heart surrounded by eight women saints of the church who were important as theologians, mystics, educators and founders of religious orders.

St. Patrick's Church has been renovated and redecorated periodically over the years: notably, in 1930, in the early 1950'a and following Vatican II in the late 1960's when the organ was moved to the front of the church and the altar was turned to face the congregation. Moving the organ pipes to the front of the church necessitated a total reconstruction and refurbishing of the main altar. The most recent "refreshing" of the Church interior was done in the summer of 1994.