In 1842, the church of Vesancy was very small and dilapidated, located in the garden of a villager, Mr. Mugnier. That is why, in November 1843, the mayor Hotellier and the town council decided to spend 30 000 francs on a new church and four plots of land.
The construction started in June 1844, and lasted until the end of 1845. The ground was so hard that it was impossible to dig. Therefore, a platform was built, and the entrance of the church would be accessible by stairs.
The best materials were used, and the vaults were carved with utmost precision. According to the entrepreneur Jean-Louis Tavernier, it was "the most beautiful monument in the region."
The clock was placed at the end of 1845 by Sir Bailly, the Count of Morez. The church was consecrated to Saint Christopher in 1847, by the bishop of Belley.