The building of the Church began towards the end of April 1846. In that date, the first stone was layed and engraved with the following quote: "Denuo constructa a fundamentis excepta in prima parte absidis, tertio idus maii (12 maggio), sub ep. aug. A. Jourdain, sub parocho L. C. Gérard can. eccl. cathedralis, testibus Rev. P. Carolo Gelin capucino et J. Pantaleone Favre e loco Salae loci rectore - 1846 - L. C. Gérard can. Salae curatus". (Rebuilt from the foundations, except for the first part of the apse, on 12th May. The Bishop of Aosta Monsignor. A. Jourdain and La Salle's parish priest L. C. Gérard canon of the Cathedral, in presence of the witnesses Reverend. Father Charles Gelin Capuchin and Jean Pantaléon Favre of La Salle, rector of the area - 1846 - L. C. Gérard).

Techincal facts: the project was created by a certain surveyor named Bocca. The execution of the construction was entrusted to Filippo Franchini and brothers of Aosta. They concluded a convention that foresaw an expense of roughly Lire. 40-50,000 to be sustained by the church, the borough council and the parishoners. Contributions by the government at the time were not provided for.

The internal length of the sacred building, from the door to the choir, is 25.5m, whilst the width is 12.25m. The length of the choir that is raised by a few steps is 11.5m. The height of the nave's vault is 12.8m, whilst that of the dome above the choir is 22m. The foundations of the walls are 2m thick and are 4m deep underground.

The sacristy: 7m long and 6m wide. It was built in 1845. The big wardrobe that can still be seen today was built by unknown craftsmen from La Salle.

The main altar, created by Giacomo Marsaglia from Turin, cost Lire. 4,500. The total cost of the work amounted to Lire. 54.415,14 and was covered by the church's and the chapel's funds, by an extraordinary contribution on behalf of the borough council and from the population's donations. Our beautiful church is the most evident testimony of the faith that spurred on our ancestors.

Relics of St. Clement, St. Paul, St. Victor and St. Giocondina were placed in the secondary altars of the aisles.

Inside, against the apse at the end of the choir, on the grand altar, dwells the magnificent painting by P. de Georgis from the Royal Academy of Arts, Turin. The painting depicts the Immaculate Conception of the Virgin Mary: Carlo Borromeo and St. Teresa of Avila are painted at her feet. The work of art was donated to the church of La Salle by King Carlo Alberto in 1848. The canon C. Gérard, parish priest and poet, dedicated him a brief composition which states...”the people of La Salle, humbly prostrate, will bless out of gratitude.....the artist who created it, the king who bestowed it......”

The decorations were realised by the Avondo brothers from Varallo and touched up in 1913 by G. Comoglio. The frescoes that ornate the walls of the choir, the dome and the nave's vault are works of the painter, Stornone.

The Bishop of Aosta, Monsignor André Jourdan ordained the new church on 17th August 1847 with a grand ceremony to which the people of the parish, the majority of the clergy of the diocese and several ecclesiastics from Tarantasia participated. In the “Feuille D'Aoste” issue no. 16 dated 30th 1847 – the local newspaper – the report on the celebration ended with the following sentence.....”The ceremony began around six o'clock in the morning and ended an hour after midday.”

From then, this monument, desired and created by the faith of La Salle's parishoners that were spurred on by the zeal and the courage of their pastor, parish priest and canon Clément Léon Gérard, dominates the whole village with its majestic and imposing façade. It also attracts the attention of all the passersby that travel along the road of the Valdigne.

In 1856, the church was equipped with the “Vegezzi Bossi” organ. Even though it has undergone a great deal of repair over the years, we still have the pleasure of listening to it today. It now has a new electric engine that brings air to the pipes.

In 1880, keys had to be put on the two aisles. The two small chandeliers date back to 1885. The face of the bell tower's clock that lights up at night, allowing you to see the time, dates to 1907. The painting of Beato Innocenzo V was placed above the northern secondary entrance door in 1900.

In 1913, the canon parish priest, E. Visendaz, commissioned other jobs to be done on the church eg. the painting of the frescoes on the façade (by Stornone), the repainting by G. Camoglio of all the internal decoration, and the repairing by the sculptor, Cengo, of the side altars. A chandelier, the re-tiling of the roof and the purchase of the two statues of St. Francis and St. Joseph, also date back to this period.

Today, our church can boast of all its beauty and its dignity thanks to its complete refurbishment. The roof has been remade, the façade, repainted, the parts made of wood and marble have been restored as good as new, the old benches have been replaced with new ones and the bell tower's spire has been coated with copper. In 1990, a small sacred art museum was created behind the main altar, with the aim of collecting, protecting and displaying to visitors all the lithurgic objects belonging to the parish church (ornaments, wooden statues, antique missals, crosses, chalices etc.) These objects in this way, are also kept safely hidden away from thieves. An altar in the choir area has been set “facing the people”, according to the lithurgical orders agreed upon during the last assembly. The old, slightly out-dated main altar is used as a simple tabernacle and is overtopped by a magnificent canvas in a gold frame, depicting the Conception. It was a gift from King Carlo Alberto.