Château de Cahaignes, Château in Vexin-sur-Epte, France

The Château de Cahaignes in Vexin-sur-Epte is a 17th-century building of limestone, dressed stone and render, with an ordered facade and a long-sloped, hipped slate roof. A central block with dormer windows is flanked by a lower wing, and the house stands at the end of a clearing behind a low stone wall or terrace.

Built in the 17th century, the château de Cahaignes stands in the commune of Vexin-sur-Epte, in the Eure. Its limestone and dressed-stone walls and slate roof are the work of an unknown master builder; the Rouen architect René Martin is linked to the site. Long owned by the Daniel de Boisdenemetz family, which supplied several mayors of Cahaignes, it passed in the early 20th century to Count Henri de Cornulier. Since 1953 the building has deteriorated, and in June 2022 Taïg Khris acquired the estate with a rehabilitation project.

The château's name comes from the hamlet of Cahaignes in Vexin-sur-Epte. Long owned by the Daniel de Boisdenemetz family, which supplied several mayors of Cahaignes, it passed in the early 20th century to Count Henri de Cornulier, mayor and Knight of the Legion of Honour. Urban explorers nicknamed the abandoned building "château des singes".

The château stands in the commune of Vexin-sur-Epte, in the Eure department. Since June 2022 a rehabilitation project has been under way, marked by scaffolding and a notice on the access gate. The building itself is not open for tours; the house is the only part listed in the general inventory of cultural heritage.

The 1953 listing as a site naturel classé covers the château and its park together, while only the dwelling itself is entered in the general inventory of cultural heritage. The estate also includes outbuildings and agricultural parts, and since 2022 it has been the subject of a rehabilitation project.