During the 14th and 15th century it was completely remodelled: in the north and west side new chapels were added, the elevation of the bell tower was increased and the southern part was enlarged. At the same time important decorative work was carried out on the internal walls with paintings of great interest for the Piedmont school.
They are showing the influence of the French, Lombard and Western Piedmont tradition, up to the late 16th century raffiguration of the Savoy castle fo Avigliana, kept on the back wall of the chapel situated in the west side. Owing to the process of urbanisation around Borgo Nuovo and the strengthening of the power of the Savoy from the middle of the 14th century, the church of San Giovanni, thanks to the support of the Provost of Moncenisio, was becoming the centre of spiritual devotion. San Pietro, due to its difficult geographical position, became a graveyard church.