Under the Ancien-Régime, the territory of Nadaillat was under the control of the parish of Chanonat, whose communalist priests came to celebrate mass and administer the sacraments. Pastoral visits confirmed that the building was in good condition and indicated that it was vaulted. After the French Revolution and the Concordat in 1801, the Église de Nadaillat became attached to the Église Saint-Genès at Saint-Genès-Champanelle. Mass was celebrated there only sporadically on certain religious holidays.
In 1838, the inhabitants fought tooth and nail to have their church one again part of the parish, as a chapel of ease to Église Saint-Genès in Saint-Genès-Champanelle. A new building was put up to replace the former church. The parishioners financed the project and helped with the work. The church was consecrated in 1842 by Monseigneur Féron, bishop of Clermont, and dedicated to Notre-Dame-de-l’Assomption. The bell tower completed the church after 1852.
The church’s architect is not known, and its style is neo-Gothic with bay frames, buttresses and a bell tower made from Volvic stone. The façade is set off by two buttresses framing the entrance and two niches. Above the niches, partly erased inscriptions give the date of 1842 on the right and “Hoc potuit pietas vici” (Here piety triumphed). A triangular pediment crowns the façade, providing a hint of neo-Classicism.
