The towers of the cathedral rise 226 ft. off the ground.

The facade is divided into nine equal portions - vertically by the buttresses, which indicate the interior divisions of the nave, and horizontally by a row of statuary and a series of arcades. The former marks the transition between the portals and the rose, the latter frames the rose and separates it from the towers. This triple stratification also reflects the divisions of the elevation into grand arcade, triforium gallery, and clerestory.