First of all, in the Netherlands, the Wet op Hoger onderwijs en Wetenschappelijk onderzoek (WHW) is the most important legislation for universities and their students. The law can be found here (in Dutch, unfortunately).
On the level of the university, there are several official rules and guidelines, concerning – amongst others – enrollments guidelines and the code of conduct. These documents can be found via this link.
Finally, at the level of the faculty, there are also some guidelines, mostly about the specific study programs. These can be found via this link. More information can be found here. If something is not clear, the central administration of the built environment might be able to give help. They can be reached via CSA.BE@tue.nl.