In 1654, his career was advanced through his appointment as the first architect to the king, He was commissioned by
Cardinal Mazarin to help rebuild part of the medieval
Château de Vincennes. File:Pavillon du roi du chateau de vincennes 01.JPG|Pavilion of the King (east façade) File:Vincennes Château de Vincennes Pavillon de la Reine.jpg|Pavilion of the Queen (west façade) Shortly after, in 1656 he was given the important commission to build the chateau of Nicolas Fouquet,
Vaux-le-Vicomte with the help of
André Le Nôtre and
Charles Le Brun. Le Vau's most notable work in the Vaux-le-Vicomte is the oval salon facing the garden. This design, an example of a ''salon à l'italienne'' (vaulted, two-storied room), develops the idea that a simple form governs the shape of the main section of the building. File:Vaux-le-Vicomte Front2.jpg|Rhythmic massing of the entrance front File:Vaux le vicomte 1.jpg|View of the garden front with the oval salon In the 1660s Le Vau helped on royal projects, such as the hospital of
La Salpêtrière and the facade of the
Tuileries Palace. From 1661 to 1664 Le Vau worked on rebuilding the
Galerie d'Apollon in the
Louvre after it burned in a fire.
Claude Perrault and Charles Le Brun were also involved in creating the famous façade for the
east front of the Louvre from 1665 to 1674, which acted as a prelude for
Classical Architecture in the 18th century. The most notable work of Le Vau's career was at the
Palace of Versailles with which he was involved for the remainder of his life. He added service wings to the forecourts and, after 1668, had rebuilt the garden façade to be totally classical. Le Vau was assisted by
François d'Orbay, who completed the work after Le Vau's death. Le Vau and d'Orbay's work at Versailles was later modified and extended by
Jules Hardouin-Mansart. Le Vau's designs for the
Collège des Quatre-Nations (now housing the
Institut de France) were completed after his death by his assistant François d' Orbay and showed unlikely rapport with Italian baroque techniques. File:Chateau de Versailles 1675FXD.jpg|Le Vau's garden front at the Château de Versailles, c. 1675 File:Instituto de Francia Noche 2.jpg|Collège des Quatre-Nations in 2014 ==Death==