In Venice, in 1441, Giorgio was invited to Sebenico to replace Messer Antonio di Pietro Paolo who had fallen into disrepute with the building committee of the cathedral of Sebenico. Antonio commenced the Cathedral building in 1431. Giorgio abandoned the Gothic style based ideas of his predecessor and followed revolutionary ideas of Italian Renaissance architecture, The whole cathedral building is roofed with wagon vaults, made of huge slabs of marble supported on strong transverse ribs, the same stone covering forming the ceiling inside and the roof outside. He was the chief cathedral architect from 1441 to 1473. From July 1, 1477 the work was continued by another architect, Niccolò di Giovanni da Firenze. In 1444 Giorgio went to Spalato to build the chapel of S. Ranier in the church of S. Benedetto. The work was finished in two years. He came back to Spalato in 1448 to make the chapel of S. Anastasius in the cathedral.