I am planning a 1st floor addition to my 2-story home that will span the rear of my home. The 1st floor addition will be a 12' x 29' foot space. The 12'dimension is a "bump out" off the rear, and the 29' figure is the current length of the home. I have been told I need either a steel beam to accomplish this in order to support the second floor or need to have the span supported by columns at 8' lenghts. I am looking to add the new space to existing space in the rear of the house preferably without columns, etc. Are there other engineering alternatives out there that will allow me to keep the open space without the steel or columns? If yes, are these other solutions more expensive? thanks.