There are four pinnacles for each of the pillars – on the sides is one bigger pinnacle, two smaller in front, which converge at an acute angle. Large pinnacles are decorated with tracery – one with a circular eight-pointed star – the Sternberg sign. On the edges and in corners are added to the pillars slender pinnacles. In the uppermost part the pillars slightly recede, the decoration is the same, just a bit simpler. They do not terminate with pinnacles, but with a skew deck called counter, over which grow to a considerable height massive pinnacles. They also protrude above the main cornice of the chapel and their weight is helping to increase the resistance of the pillars, into which converge arch ribs of the stone vault. On the southeast wall above the window is located in the left corner stone sign of the Sternberg family in a decorative canopy, also terminating in a pinnacle. The windows are quite wide, decorated with diverse and truly rich traceries with Rayonnant motives and each of them divided by two rods. The roof has not been preserved in its original form. Before the reconstruction it was only an “emergency” roof – shed roof. Today, it is a new tent slate roof, which fully applies the slender contour of the chapel. The rafter construction is mostly cock-lofted, and as for the material, pine wood was used. The vault of the Sternberg chapel is designed into an eight-pointed star, which was to be found on the shield of the Sternberg family. 7 suspended ribs are coming out of the star. They are connected deep beneath the vault with a decorative stud with figural motives, where again we can see the Sternberg sign. The belonging of the chapel was therefore properly emphasized. On the southern wall near the floor tiles are located various niches. One of them, a wide and doubled one is a so-called sedilia – the seat for the priest. A wide segmented arched niche to the right was originally closed with a grating and served as a depository of worship utensils. Similarly narrow, tall and tapered side niche was used for special items – e.g. candles. The original entrance to the chapel was in the north and it was possible to enter directly to the right nave of the church. In the 18th century there were two altars in the church, one on each side – the altar of St. Barbara and St. Catherine.