Although New Jersey has a license requirement for every imaginable service or occupation, there isn't any for a commercial communications site project. Mind you, we're not complaining. Check for requirements on the local level.
Electricians must be licensed. If you are going to check, there is no easy web site access. To find out if an electrician is licensed in New Jersey, call (973) 504-6410.
Out-of-state corporations working in New Jersey must be registered with the State. For information, click on registration.