All the info about admissions based on country and diploma type (including IB) were quite easy to find on the EPFL admissions website. (
link to page with relevant PDF files). As Lob said, however, for *important* things, it's usually best to phone and talk to a real person.
It's a great school, but just so you know, all bachelor's-level programs are only offered in French. They will recognize your English-language IB diploma, but to be accepted you'll have to demonstrate a good understanding of French as well.
Good luck with your application.