The house is either measured in the field or taken from building plans submitted during the permitting process and verified by field review. The house is then classified based on construction type and quality, then depreciated according to its age and effective age (observed condition). Typically, the market value is based on sales of similar properties. In some circumstances, such as new construction, the appraiser may utilize the Cost Approach to Value, but typically a residential property is appraised via the Sales Comparison (Market) Approach basing the value on comparable sales within the subject neighborhood, adjusting for differences such as lot value, quality, condition, and size.