In Illinois, every contractor who wants to legally do work inside the state needs to apply for a contractor’s license. For a roofing company, that’s a specific license, so you shouldn’t ever find roofers doing plumbing work or vice-versa – though if they’ve got the licenses it’s hard to argue. In a very real way, licenses are a convenient way for the city and state to keep tabs on who’s doing work within their borders. That way, should something unfortunate occur, it’s clear where the fault lies from the permits and licensing on file.
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