<prompt> Human: Im at a loss for figuring out how to calculate what building a house would cost based on a floor plan. I would like to plan for my next and final home, and I would like to have it built so I get exactly what I want. I can figure out what I can afford and I can figure out how much to save for a down payment based on the mortgage I can afford. But how can I find a floor plan that fits my budget without knowing what it will cost to build that floor plan and buy land that it will fit on? Some of the sites Ive been on have a cost-to-build estimate, but the range they use is seemingly worthless because its so large e.g. range from 200,000 to 500,000. If anyone knows the best way to figure this out, Id appreciate the advice.  <response>: You need to talk to a builder. Depending on the materials used it would be easy to build the same house for 200k or 500k. 