St. Patrick Church is of Gothic design. The architectural firm of F.J. Schwarz designed the structure. An interesting historical aside is the offices of the architect being in the historic Woolworth Building in downtown New York City.

The exterior of the church consists of stone quarried in Glastonbury, Connecticut, and features a slate roof, belfry, and large oaken doors. Each door handle is forged in the shape of a serpent. The architect desired durability, so he specified stone floors, massive oaken rails, and solid buttresses.... On November 22, 1936, the Most Reverend Maurice F. McAuliffe, D.D., the Eighth Bishop of Hartford, dedicated the new church. The original church, which was heavily damaged by fire in 1925, was dedicated in 1852.