Contractor License legit?

[David S.]

While checking out a roofer to do some roof maintenance on a flat tar and gravel roof, I discovered that the license number that he Gave me belongs to a roofer in Los Angeles instead of San Francisco where we are located. This roofer in San Francisco said the license is his partners although these guys do not seem to work under any corporate entity.

Should I be concerned about this?

Can 2 self employed partners work under one license?

Both of them appear to be under the radar of review sites like Yelp. I have also asked for references but he has not been forthcoming except to say that he can show me a lot of contracts whose value is much more than the small job he is quoting me.

As I write this, I think I should pass on this guy.

What do you all think?