Leveilly was probably a pupil of François Blondel or of Robert de Cotte.
In 1717, at the behest of Elector Joseph Clemens of Bavaria, he came to Bonn as an architectural and decorative draftsman to help realize the buildings designed by the Parisian court architect Robert de Cotte.
In 1728, Leveilly was appointed sub-architect and was also responsible for the gardens, then in 1733 he became senior architect.
[1] There, Leveilly was mainly active as executive architect, realizing the plans of François de Cuvilliés, but also contributing and implementing his own ideas, especially for the interior finishes.
In his second marriage, Leveilly took on 5 December 1743 in the Bonn parish church St. Gangolf Agnes Gladbach to wife.