South of the Eure department, the village of Saint-Ouen-d'Attez dates back at least to the Gallic occupation, Attez coming from the Gaulish term for "rural house." The church of Saint-Ouen has been documented since the early 12th century. While Romanesque remains remain on the west gable, buttresses, and section of the north wall, it was largely rebuilt in the 16th century in the Flamboyant Gothic style, with the nave, choir, and the addition of the south aisle, formed by four side chapels with vaulted bays.
The bell tower was built in the late 17th century, and extensive restoration work was carried out in the 19th century. It is also worth noting that a charity chamber housed the Charity Brotherhood of Saint Barbara, founded in 1736. Banners and clothing belonging to this brotherhood can be seen in the church.
A large number of graffiti and devotional crosses can also be seen on the church, the oldest of which date back to at least the 17th century. The small room attached to the west gable, in line with the south aisle, could correspond to a Charity Room. In the early 1980s, the choir roof had collapsed and the municipal council voted by a majority vote to carry out a phase of restoration work on this choir, otherwise the church would have been closed and abandoned.