The facade is embellished by the pinnacled doorway in white marble where a statue of Saint Paul is placed at the center.

The church is a beautiful example of Gothic architecture in which echoes of the traditional Pistoian polychromy can still be seen. Interior was redone in the Baroque period with the creation of altars (of which only the high altar and two side ones remain today), confessionals and the presbytery stairway with its pietra serena balustrade.