One of my life goals is to design and build (er, mostly pay someone else to build) my own house. I think my finances are on track to make it doable around the time I retire or possibly even a little before, but I want to narrow the figure down a bit to get a firmer number of how much I need to save. I have an idea of what kind of terrain I want the house on and in what part of the US, approximately how many square feet, and I've got some basic designs worked out on paper. I used to have them in Sketchup too until that became not free anymore. The problem is, all the online calculators to figure out how much a home would cost to build seem to be based on traditional 1, 2, or 3+ story designs. My design is a tri-level that includes a lofted upstairs master suite that looks out onto the open below-grade walk-out living room, as does the ground-floor kitchen. I have no idea how to map that onto the conventional types of calculators. Is there a calculator out there that is layman-friendly but also accounts for design oddities like this? Or, is there a manual way to calculate the cost instead?