On top of the Union's own governing documents - the Union Constitution & Bye-Laws - a number of agreements between the Union and College, as the parent institution exist.
Under the Education Act 1994, each University and Union are required to have a Code of Practice setting out key legal requriements. Imperial College Union also has a Partnership Agreement, Space and Funding Agreement with the College. The Union's Code of Practice with the College, and Partnership Agreement were last updated and approved with the College Council and Union Trustee Board in April 2013.
The documents are available here:
The Union also features in the College Ordinances, particularly regarding issues of student discipline.