While these ads are tempting because of the low prices these people offer to do your contracting work, you could be paying far more than you think if you choose an unqualified or unlicensed contractor--and risking your family's safety.
You do not want to be in a situation when you have absolutely no recourse if somebody takes the money and does sub par work, or no work, or if someone gets hurts in your house due to their unlicensed work. It is unbelievable (and scary!) some of the things that can happen when dealing with an unlicensed contractor; that's why it is truly important to do your research before choosing an electrical contractor.
Every electrical contractor has a license in his office and is required to carry a card showing what that license is if someone asks. This license reflects that the contractor has passed certain qualifications. The Nevada Contractor's Board is a great resource when searching for an electrical contractor. You should also visit the Better Business Bureau's website to see if there have been any complaints about a contractor.
Make sure to ask the contractors about their previous experience and how familiar they are with the type of work you are requesting. Ask as many questions as you need to find out about how the electrical contractor operates, their pricing structure and what you can and should expect from them.
One of the best ways to decide if a contractor is right for you is to ask for some references and to follow-up with those references. If a contractor is unwilling to give you references, then a red flag should automatically go up.