There was already a church in Bellou-en-Houlme in 1053, when the building was donated by Guillaume de la Ferté-Macé to the Abbey of Saint-Julien in Tours. The bell tower-porch appears to be of Romanesque origin, having been built in the 11th century and then remodeled in the 12th century. Several architectural elements bear witness to this: "the semicircular arches, the small round interior door above the gallery, the narrow openings of the bell tower, the modillions bordering the dripstone" recall the 11th century, while "the pointed arches which are inscribed in the semicircular arches and especially the underside of the tower where the tore-shaped arcades intersect, each ending in a abacus" (Le Pays Bas-Normand, 1962 n°2) show that the tower was modified at the end of the 12th century. The rest of the building was largely transformed during the first half of the 18th century, as indicated by the date 1718 inscribed on the lintel of the door of the south arm of the transept and that of 1749, inscribed on the lintel of one of the south bays of the chevet. The church was originally surrounded by a cemetery, transferred outside the town in 1840.