Exterior, Prefab Building Type, Wood Siding Material, and House Building Type Each Deltec model has two floor plan options, all designed to maximize energy efficiency without compromising on livability. Pre-designed to use two-thirds less energy than a typical home, the remaining one-third can be powered with renewable energy. If wind resistance is a priority, we highly recommend our round models.  Photo 2 of 11 in 10 Kit Home Companies in the South