The church has a very pretty Renaissance-style choir entrance. Certain stained glass windows, the woodwork of the choir, the altarpieces and the font are classified.
The current church, rectangular in plan, replaced a 12th century building. The flat bedside and the north wall, equipped with Romanesque windows and slightly projecting buttresses, date from this period. It was rebuilt and probably enlarged in the first half of the 16th century. It was then covered with beautiful paneling, the beams of which bear the arms of the Vove, lords of Saint-Agil. The church is also flanked to the south by a seignorial chapel of two bays opening onto the nave with two molded semi-circular arches: its ribbed vaults, with eight ribs leading to the four peaks of a central diamond, are each decorated with four sculpted pendant keys, one of which also bears the arms of the Vove; the date 1547 can be read on its door. The church is currently preceded by a bell tower built in 1886 by Mr. Travaillard, an architect in Saint-Calais.
A window to the south of the choir has preserved a partly restored 16th century stained glass window, representing Saint-Agil and Saint-Fiacre, and one of the windows of the seigneurial chapel has another, representing the Nativity, the Adoration of the Shepherds and the Adoration of the Magi; the other window of this chapel has a modern stained glass window retaining some old fragments in the speckles. The choir was decorated with woodwork including an entrance arcade surmounted by a crucifix, stalls, a communion table and an altarpiece, the latter dated 1734. We can also point out a font decorated with balusters and of a skull (1552), the poetic epitaph of Catherine-Geneviève de Verthamont (1740), a painting representing a martyr (17th century), a Louis XV console and a Venetian glass chandelier.”