Is a permit required for replacing the front exterior light?
Every location can be different, but this hasn't required a permit anywhere I've ever lived. The only difference between changing this fixture and plugging a different light into an outlet is that the fixture is hardwired. Upgrading your service typically involves an addition to your home, or running a new circuit for something like a kitchen remodel. Anything at or after the junction box should be able to be changed without getting an electrical permit.