His workshop was in Calle Cucurulla, Barcelona, and commissions from a variety of patrons, mostly royal, are documented. In 1324 he was paid for painting two chapels and two crosses for the church at Sitges. Between c. 1333 and c. 1335 he illuminated a book on the Usages of Barcelona and Customs of Catalonia for Alfonso IV of Aragon, and in 1335 he was paid for an altarpiece. Further payments, in 1339 and 1340, were for two altarpieces for the chapel of the Aljaferea Palace (a Moorish palace) in Saragossa. About 1340 he received a commission for an altarpiece of St Hilary for the diocese of Lleida (Sp. Lerida). In 1341 Bassa had begun work on three altarpieces for the Episcopal See at Lleida, commissioned by Ot de Montacada (c. 1290-1341). In 1342 Peter IV (the Ceremonious) of Aragon asked his wife, Maria of Navarre, to send him a Book of Hours illuminated by Ferrer Bassa, and in the same year the artist was also paid for a commission by Queen Constanza of Mallorca. In 1343 and 1344 he was paid for an altarpiece and other works for the chapel of the Aljaferea Palace in Saragossa and for an altarpiece for the chapel of the royal palace at Barcelona. In 1344 Bassa was commissioned to decorate the S Miguel Chapel, then the cell of the abbess in the Pedralbes Monastery, Barcelona, although he only started work in 1346. He was involved in further royal commissions in 1345, including an altarpiece for the chapel of the castle at Perpignan.