Hôtel Bouctot-Vagniez, Art Nouveau private mansion in Amiens, France.

The Hôtel Bouctot-Vagniez is a three-storey Art Nouveau private mansion in Amiens, built 1909–1911 to plans by Louis Duthoit. Its pale beige stone walls carry dark slate roofs: a tall pyramidal roof over a projecting section with a large mullioned arched window, a steep hipped central roof with metal cresting and pointed-gable dormers, and a rounded balcony on a gabled wing. A glass-and-metal canopy shelters the entrance door.

The mansion was commissioned in 1906 by André Bouctot, an investor from a wealthy Rouen family, and Marie-Louise Vagniez, heir to an Amiens textile fortune; part of her dowry paid for the building. Architect Louis Duthoit, descendant of the Duthoit brothers who restored Amiens Cathedral with Viollet-le-Duc, drew the plans in 1908. Construction ran from 1909 to 1911 and cost about one million gold francs.

The residence displays how Art Nouveau designers brought nature into every corner, from wall paintings to ornamental details on windows and doors. This decorative approach reflected the taste and modern outlook of wealthy families of that time.

The mansion is a private building and cannot be visited inside; its facades, garden and the 2012 extension by architects Karine Chartier and Thomas Corbasson can be seen from the street. It became the property of the Compagnie de Phalsbourg in 2018, with a hotel and spa conversion planned.

Louis Duthoit was given free rein by the couple, with only two conditions: animals had to appear on the exterior and floral themes inside. This constraint produced one of the most homogeneous Art Nouveau buildings, where carved fauna outside answers the flower decoration within.