[1] After the war he returned to Milan and, with Corrado Corradi Dell'Acqua and Ignazio Gardella, started Azucena, a company which designed both furniture and furnishings such as door-handles and lamps.

[1][4] In 1947, Caccia founded Azucena with Ignazio Gardella and Corrado Corradi for which he created hundreds of design objects including lamps and furniture.

[6][7]  His extensive architectural production, characterized by the ability to dialogue with the pre-existing structures without renouncing the use of new forms and technologies, begins with the construction of the family home in Piazza Sant'Ambrogio in Milan (1947-49), which followed by the BVA institute in via Calatafimi (1948-54), the Loro-Parisini in via Savona (1951-57), the office and residential complexes in Corso Europa and Corso Italia (1953-66 and 1953-59), the building of Santa Maria alla Porta (1961), the building of Cartiere Binda (1966), the connection between the church of San Fedele and the Manhattan Bank in piazza Meda (1969), the residential buildings in via Ippolito Nievo and piazza Carbonari (1955 -56 and 1960-61), the complex in San Felice with Magistretti (1967-75), the Vanoni Library in Morbegno (1965-66), the Oxford Palace in Corso Milano in Monza (1963) and the Church of San Biagio in Monza (1968) and the two towers in the Principality of Monaco (1976-80) [8] [9] .

From 1965 there were numerous collaborations with Francesco Somaini , such as in Milan for the renovation of the former Verziere, now Largo Marinai d'Italia - Formentano park, where Caccia invited the sculptor to study the suitable monument with him.

The eighties continue with the Monticello complex (begun in the seventies), that of Morbegno with the church of San Giuseppe, the arrangement of the elevated pedestrian paths of the Milan Fair.