Cintia, there is no such requirement for roof access (on most homes you have to climb a ladder). I assume you might mean for a condo or apartment type construction. In this case, there are egress requirements, and if you have equipment (like an AC compressor unit) located on the rooftop, then access may be required so you can service it. In general, rooftop access is always a good idea to provide, but I have seen some VERY scary ones that I would not be traversing as an occupant (I wasn't all that thrilled about going up there even being paid to do so).
I have done TONS of new construction inspections through out the Philly area and can give you some advice, pointers, or (hopefully) even be of help to you.