The building comprises a nave with two narrow aisles giving access to three side chapels, these furnished with six altarpieces.
On the north side chapels the altarpieces are dedicated to the Immaculate conception,  sainte-Thérèse d'Avila and the "Vraie-Croix" whilst on the south side the dedications are to saint Roch, saint Fiacre and Notre-Dame de Délivrance.

The north transept has an altarpiece dedicated to the Sainte-Parenté and the South transept has an altarpiece dedicated to saint Isidore.
The transept also holds a further two altarpieces in white marble each with four columns.
The painting which is part of the altarpiece in the south transept depicts "Christ aux outrages",  whilst that in the north transept depicts the "Presentation in the temple".

The altarpiece entitled the  "Résurrection du Christ" in the choir area dates to 1744, the sides of this altarpiece holding statues of saint Patern and the Virgin Mary.
 The choir area comprises three crossings, a painting, columns of black marble supporting a curvilinear corniche above which is another niche.
The main altar shaped like a tomb in white marble and dating to the 19th-century is surmounted on each side by adoring angels.
In this area, wooden niches hold statues of saint Peter and saint Paul.
The building comprises a nave with two narrow aisles giving access to three side chapels, these furnished with six altarpieces. On the north side chapels the altarpieces are dedicated to the Immaculate conception,  sainte-Thérèse d'Avila and the "Vraie-Croix" whilst on the south side the dedications are to saint Roch, saint Fiacre and Notre-Dame de Délivrance.
The north transept has an altarpiece dedicated to the Sainte-Parenté and the South transept has an altarpiece dedicated to saint Isidore. The transept also holds a further two altarpieces in white marble each with four columns. The painting which is part of the altarpiece in the south transept depicts "Christ aux outrages",  whilst that in the north transept depicts the "Presentation in the temple".
The altarpiece entitled the  "Résurrection du Christ" in the choir area dates to 1744, the sides of this altarpiece holding statues of saint Patern and the Virgin Mary.  The choir area comprises three crossings, a painting, columns of black marble supporting a curvilinear corniche above which is another niche. The main altar shaped like a tomb in white marble and dating to the 19th-century is surmounted on each side by adoring angels. In this area, wooden niches hold statues of saint Peter and saint Paul.
Église Saint-Patern de Vannes