The parish church of Saint-Quay is an orientated building with a single nave built of granite rubble. Built in an elevated enclosure, it comprises a nave, two transepts and a choir extending the main nave. It includes a sacristy and a font chapel. The western section comprises a central tower bearing a gallery with a corbelled balustrade and a three-bay bell tower, with a circular tower on each side housing a masonry staircase. A number of decorative features are visible both inside and out: the head of an angel, the arms of the Lords of Rosanbo sculpted in high relief, coats of arms sculpted in low relief on the chevet, and pointed-arched windows. Saint-Quay-Perros has one of the few remaining cemeteries within a parish enclosure. (Key available from the Town Hall).
