The company should have a lot of dealers/contractors who purchase from them in addition to their direct sales. This is important because a company who has 500 dealers tells you that there are at least that many local General Contractors who purchase buildings from that company on a regular basis. If a company does not have any dealers or very few, it means that even the General Contractors in the industry are not buying their product. Or maybe they haven't been around long enough to generate interest in their namtrungcons steel buildings
The company must offer full project coordination and be willing to verify building codes in your area. Today many companies try to pass off outdated building codes or incorrect code requirements for the sole purpose of selling the consumer on a cheap quote. Then the contracts will say something to the effect of "purchaser is responsible to verify local building codes. Charges may be applied in the event seller was not provided with accurate building codes." The company should be able to give you the name and contact number of your local building authority that they speak with to obtain the codes for you. Remember, the company is trying to earn your business. If they are unwilling to spend the half hour to obtain this info for you, there is something wrong.