@EdRick - As @rugby girl said, word of mouth is a great place to get a head start on contractors to use. If you need other places to look for a reputable contractor who will meet or exceed the building code as stated in the article, try contacting your state's website listing for their residential construction commission once you get a company name to make sure that the contractor in question holds a *current* license with your state as well.
Your local city's building office listed in your city's website can tell you what the current building code they use as well. Additionally, ask them what type of permit is required to do the work and make sure the contractor you select pulls one (ask for a copy of it so you can show proof of the work done to your interested buyer). Good luck!