KCAP is an internationally operated Dutch design firm specialised in architecture and urbanism. The firm is lead by its four partners: Han van den Born, Kees Christiaanse, Ruurd Gietema, and Irma van Oort.

KCAP, a Rotterdam and Zurich based firm, was founded in 1989 by Kees Christiaanse. The office has been working with an international staff of 75 employees, who are committed to all phases of the architectural and urbanistic design processes. Despite the large number of employees, the office managed to retain its horizontal hierarchy. Through the presence of cross-cultural disciplines new perspectives emerge, which in turn affect local practices. This is the result of a multi-diciplinary commitment and continuous involvement from preliminary sketch-design to the projects' completion.

KCAP's oeuvre is wide in scope and ranges from complex urban transformations and landscape design to architecture and interiors. More than 300 projects have been designed since its founding, of which more than 150 are realised in the Netherlands and Germany, the UK, France and China. Furthermore, KCAP participates in European and Asian based projects.