With its domed corner tower and ornate terra-cotta entrance, St. Joseph Church is a rare example of Spanish Colonial Revival in Hawaii. This reinforced-concrete, basilican-plan building has a red tile gable roof with overhanging eaves and exposed rafters. Shed roofs run the length of the building and shelter the side aisles. On the interior, round-arched arcades surmounted by semicircular clerestory windows delineate the side aisles and establish the rhythm of the nave. A larger, round-arched opening frames the domed chancel. Round-arched stained glass windows from Belgium adorn the nave and chancel, and king-post truss work supports the roof.