For single family homes, there are two basic methods used in real estate appraisal. They are replacement cost analysis, and using comparable sales. A third appraisal method, based on capitalization, is used for income properties, and is covered in another article. In figuring replacement cost the question is: What would it cost to buy this land and put this house on it? If the land (improved) would cost $40,000, and the house could be built for $150,000, the value indicated would be around $19.