Born in Quebec, Badeaux was the ninth of ten children, By age 13, his family was living with an aunt in Trois-Rivières.
When an American army approached Trois-Rivières in 1775, Badeaux was dispatched to meet their commander, Major General Richard Montgomery.
In 1781, in appreciation for his loyalty during the war, the British government appointed Badeaux as a notary for the entire province.
Badeaux represented many Quebeckers in unsuccessful negotiations with the U.S. Government for supplies that were requisitioned by the American army during its occupation.
Badeaux also represented the Ursuline religious order from Trois-Rivières in dealings with the provincial government in Quebec City.