Discussions regarding the functional design of second chambers in federal or quasi-federal systems seem to focus mainly on legislative functions. Thus, extra- or non-legislative functions related to the executive branch or the judiciary have been rather neglected in the literature. This paper will examine the extra-legislative functions of second chambers which include Austria, Belgium, Germany, Italy, Spain, Switzerland and the United Kingdom. By grouping the functions into different categories (relations with the Government, appointment functions and functions in the field of international affairs, powers in relation to the European Union and functions granted to maintain the legitimate constitutional order), their effectiveness in serving the purposes of bicameralism, and of regional representation, will be explored.