Château de l'Épinay, Listed heritage castle in Carquefou, France.

The Château de l'Épinay is a 17th-century castle in Carquefou, Loire-Atlantique. Its long, pale beige stone building has two storeys of evenly spaced rectangular windows and a steep dark grey roof with four tall brick chimneys and a row of rounded dormer windows. A low balustraded stone wall with a central round-arched gateway stands before it, with small green shrubs behind and a wide lawn in front.

The property was built between 1642 and 1650 and replaced an earlier structure damaged during the French Wars of Religion. The new construction marked a turning point in the post-conflict recovery of this region.

The castle displays the classical building style of the 17th century with its protected facades and roofs arranged around an inner courtyard. The layout reflects how nobles in this region chose to design their homes.

The castle is located in Carquefou and is easily accessible through the town, as it is a registered site with a well-known location. Visitors should check the current accessibility conditions beforehand, as it is a protected monument.

The château was designed by François Mansart, the architect credited with popularising the mansard roof, and it was built for Guillaume Harouys between 1642 and 1650 on the remains of an older castle wrecked in the Wars of Religion. The property later passed through the Harrouys, Becdelièvre, Taverne, Linsens, Boucher d'Argis and de Montbeillard families.