TheFork users who ate in Voisins-le-Bretonneux have said really good things about La Ferme de Voisins, Auberge du Manet and Bistro Birdie. Maybe you should give them a try!
Some of the more popular Seminar restaurants having a terrace in Voisins-le-Bretonneux according to TheFork users include:
La Ferme de Voisins, with a 9.2 rating
La Chalosse, with a 9.5 rating
La Plage Bretonne, with a 9.4 rating