He was named advocate general of Lower Canada later that year.
In 1812, he was named an honorary member of the Executive Council.
He served as lieutenant-colonel in the militia.
In 1812, Perrault was named judge in the Court of King’s Bench for Quebec district.
He was named to the Legislative Council in 1818 and was speaker from 1823 to 1827.
Perrault owned the seigneury of Sainte-Marie.
He died at Quebec City while still in office in 1827.
His brother Jacques-Nicolas served in the legislative assembly and legislative council.