Carlos Castanheira & Clara Bastai, Architects, Lda. was founded in 1993 by architects Carlos Castanheira and Maria Clara Bastai. 

Working, mainly, in the private sector, Carlos Castanheira has acted as juror on competition panels, participated in conferences, has been involved in setting up Architectural education courses and workshops, has curated and organized exhibitions, and has edited and published books and catalogues.

Since he was a student he has been collaborating with the Architect Álvaro Siza in various projects in Portugal but, mostly, abroad.