There is another way that the roofer is allowed to perform his roofing practices if he does not currently have a license to do so. He can be "qualified" with the State and local building department by someone else using their license to do it.
This may not be a bad thing but questions should be asked why this method has become necessary. Is he in the process of getting his own license? Is he just not able to pass the requirements for getting a license? Was his license revoked or suspended by the State and local jurisdiction for improper roofing or business activities?
Don't be afraid to ask the tough questions and verify their responses with the record. We would be glad to help you attain all this information or you can look every bit of it up because it is considered to be public record and in the public domain. All the reasons may be innocent but if you are going to spend a lot of money with this roofer, then shouldn't you be aware where he stands in his profession and his competency as a professional?
All licenses are issued to individuals so if the license being displayed by the roofer you are talking with or with any other member within that very company, then see just what the State has to say about the roofer, the company and the individual to whom the license is issued.