His work is considered emblematic of the development of the Renaissance architectural paradigm in the middle of the sixteenth century.
[1] In 1559, he designed the Case del Gambero, a set of mansions in the historical centre of Brescia (with frescoes attributed to Lattanzio Gambara); in 1560, he directed the expansion works of the Chiesa dei Miracoli, and in 1566, he restored the parish church of Gambara as well as that of Fiesse on behalf of the bishop Bollani.
He directed the architectural works for the Palazzo della Loggia in Brescia, which had originally begun in the previous century.
The upper hall of the palace was covered in 1560, while the windows, incorporating suggestions from Palladio, were modified in 1562.
[3] Beretta is considered the finest architect of the period, and his oeuvre extended to other palaces, notably of the Lana-Ghidella, the Dolzani-Masperi and the Martinengo-Cesaresco dell'Aquilone.