The initial cost of using an insulated concrete wall system is about 2-5% more expensive than traditional frame wall construction. However, once all factors are considered the costs are roughly the same. Here is an example supplied by the National Association of Homebuilders:
Many ICF builders are getting a premium price from the homeowner who also sees the benefit of this construction method. Additionally, builders are beginning to market the "cost of ownership" rather than the up front purchase price of the home.