The history of the Cathedral of Saint Etienne in Toulouse is complex; this explains the misalignment of the choir from the end of the 13th century in relation to the nave built a century earlier. The construction of the bell tower was spread over the 13th to 18th centuries (18 phases in total). This edifice has undergone numerous restorations over the last fifteen years, all carried out by W-Architectures. They pertain to the high roofs, the buttresses and roofs of the chapels, the vaults of the nave, the stained glass windows, the bell tower and the west facade. All the areas around the cathedral were redesigned during the construction of the underground car park.