A church large enough to accommodate at least a thousand people was therefore needed. The municipal council deliberated to establish a financing plan for the construction of this church: sale of thinning pine trees, sale of municipal property, and a loan. With the necessary sum having been raised (approximately 120,000 francs, including the purchase of the land), the work was entrusted in 1889 to the architect Louis Labbée, a disciple of the Bordeaux architect Jean-Louis Abadie.
Louis Labbée proposed to the elected officials a Poitevin Romanesque-style project largely inspired by the church of Sainte-Marie-de-la-Bastide in Bordeaux, with a bell tower and pinnacles covered with tortoiseshell tiles, a style unique among Landes churches. The wooden vault, shaped like an upside-down boat hull, and the porch integrated into the bell tower helped offset the weight of the roof. Another Morcense peculiarity, and to be consistent with the existing urban layout, the apse of the church was deliberately oriented to the west by the architect, thus placing the church in perspective with the east-west axis that crosses the town center square.
It was consecrated to Saint Vincent de Paul in 1896. The belfry was equipped with a bell in 1895, to which two more bells were added in 1954 and 1988. A beautifully crafted organ was added in 1979.