As the Empire style became more entrenched, and his success grew, Lannuier produced larger, more expensive pieces including sofas, cylinder desks, and bedsteads. While his pieces are considered within the Empire style, Lannuier's work is distinct for being more delicate and for recalling the refinement found in the Directoire style. Examples of Lannuier's furniture can be seen in the White House Red Room, the Albany Institute of History and Art, the Museum of Fine Arts, Boston, and New York's Metropolitan Museum of Art and Bartow-Pell Mansion.