A person looking to find work as a certified contractor must first ensure he gets the required certification from his specific state. Each single state has its own prerequisites and rules that must be fulfilled before one gets certified as a contractor. A key requirement for all contractors is that they must pass the state exam. If a contractor happens to move to another state, he is required to sit for the state exam in that particular state before he can start working as a contractor there. While a contractor is not required to be certified in all the different states before he or she can begin practicing as a contractor, it is advisable to do so as he will be able to get more work when he or she is certified in various states. Read more.