In 1862, he designed a project for the economic of development of the Tiri a Segno, and was awarded first prize and a gold medal by the Provincial Commission of Milan.
In 1863, he formed part of the Italian Deputation sent to the Gran Tiro Federale della Chaux de Fonds.
For this project King Vittorio Emanuele awarded Sfondrini the Cross of the Order of Santi Maurizio e Lazzaro.
His masterwork was the reconstruction of the Theater Costanzi in Rome (inaugurated in 1880), although he had financial overruns in completing the project.
The theater has three rows of box seats, and it was much lauded for its acoustic setting and the modern lines.