The appraiser starts by gathering information about the property. Some of this information is the location, type of neighborhood, size, rooms, improvements, age, condition, and unique features. Most of this information comes from city records and the same MLS that REALTORS use. Your city has a fair amount of information regarding your house including a sketch of the house perimeter. The MLS will contain additional information, pictures in particular, if it was listed before. These records are not always accurate. The appraiser may ask you to confirm some of the information over the phone. Recent improvements or additions are good things to point out.