Château Boulard, Pleasure house in Biarritz, France.

Château Boulard is a private mansion in Biarritz, built in the eclectic style of the late 19th century by Joseph-Louis Duc, with Louis-François Roux completing the work. Its pale grey-pink ashlar facade rises above a dark grey base, with rows of rectangular windows, a projecting central balcony on a balustrade, a steep slate roof with dormers and tall chimneys, and a domed round tower with a lantern on the right.

Charles Boulart, a forges owner and deputy from Linxe in the Landes, bought five hectares at Biarritz in 1872 and commissioned the villa from Joseph-Louis Duc, architect of the Palais de Justice in Paris. Duc died in 1879 before completion, and his assistant Louis-François Roux finished the building in 1881. The Boulart family is generally recorded as moving in around 1883.

The house owes its nicknames to its history: Charles Boulart and his family called it villa Belle Fontaine, while Biarrots dubbed it Folie Boulart for its rich architecture and decoration, a name the current owners kept. From 1930 the Notre-Dame de Sion institution ran a girls' school and boarding house here until the 1974 sale.

The house is a private residence and cannot be visited inside; its facades and roof are the protected elements, listed since 29 October 1975. It stands at 63 metres altitude on the avenue du Château in Biarritz, so the exterior is seen from the public street. Look up at the slate roof, dormers, chimneys and the domed round tower.

The building is a private residence and cannot be visited; its façades and roof were listed in the supplementary inventory of historic monuments on 29 October 1975. Its owners kept the nickname Folie Boulart, given by Biarritz residents for the richness of its architecture and decoration.