The best way to determine the cost of building your house plan is to consult a builder in your area that builds houses similar to the one you are interested in. Keep in mind that costs can vary from builder to builder and your choice of finishes, cabinetry, fixtures, etc. will greatly influence the cost of construction. If you are getting bids from more than one builder verify that they are allowing for the same items. You want to make sure you are comparing apples to apples.