Sts. Peter and Paul church is a brick Romanesque Revival building with onion domes atop the square towers. These towers flank a triple, round-arched, recessed entrance portico supported by rather spindly sandstone columns with ornate cushion capitals. The exterior walls are Vander Heyden brick, now painted light gray. The interior plan has a barrel-vaulted nave and a wide transept. Light filtered through brilliant stained glass windows depicting biblical scenes illuminates the interior. In 1882 Friederichs and Staffin of Detroit created the nave windows and in 1924, when transept wings were added, the successor firm, Detroit Stained Glass Works, manufactured two large transept windows depicting the Nativity and the Resurrection. Peter Dederichs of Detroit was a specialist in Catholic church designs. The church was first organized in 1863 when some fifty Catholic families lived in the Ionia area.