Giovanni di Simone restarted the construction in 1272. In 1292, Giovanni Pisano measured the inclination of the tower with a plumb line. The final two floors of the tower were added between 1319 and 1350. In 1360, Tommaso Pisano completed the construction, erecting the belfry and making the last important geometric correction of the structure. In 1372, the bell chamber was added on top.