This architect is regarded as Pre-Modernista due to his eclecticism and historicism, but some of the works of his later period contain fully-fledged Modernista elements, such as glazed ceramics and brick, in which his personal imprint can be appreciated. His architecture can be ascribed to the Neo-Medievalist aesthetic and his clientele was mainly ecclesiastical, so most of his plans were for churches, of which the church of Les Saleses (1885; Passeig de Sant Joan, 88-92) is the most prominent. As a result of the influence of these bourgeois customers, his style was rather monumental, as in the building of the former Societat del Crèdit Mercantil (Mercantile Credit Society, 1896-1900; Ample, 11; now the Elisava Design School).
He was the architect of the López family (Palacio de Sobrellano in Comillas, in the north of Spain, and the design for the façade of Barcelona cathedral) and Joan Güell Ferrer (Palau Güell de Pedralbes; currently the central module of the present Palau Reial, or Royal Palace).
He acted as an advisor to the Board of Works of the Temple of the Sagrada Família, and it was he who recommended A. Gaudí to direct the work on the building.