Site: nolo.com
... For example, a lawsuit against a contractor for doing substandard construction would be for breach of ... contract (because the contractor agreed either orally or in writing to do the job properly). ... This is usually the heart of the case -- you'll need to prove that the contractor failed to do agreed-on ... And in many states, if you are suing a contractor or other businessperson with a state license, you can ... However, if you can't identify any collection source -- for example, if you're dealing with an unlicensed contractor ...