He entered the École nationale supérieure des Beaux-Arts in Paris.
After graduating in 1955, Andrault joined his fellow student, Pierre Parat, in business in 1957.
The pair won a competition for the construction of the Basilica Sanctuary of the Madonna delle Lacrime in Siracusa in Sicily.
The controversial and modern design gained them notoriety, and they were contacted by the Caisse des dépôts et consignations for the construction of housing, working with Bouygues.
Andrault collected pre-colonial artifacts from Africa, Northern Ireland, and Burma.