Once the site has been inspected, an appraiser uses two or three approaches to determining the value of real property: a cost approach, a sales comparison and, in the case of a rental property, an income approach.
The cost approach is the easiest to understand. The appraiser uses information on local building costs, labor rates and other factors to determine how much it would cost to construct a property similar to the one being appraised. This value often sets the upper limit on what a property would sell for. Why would you pay more for an existing property if you could spend less and build a brand new home instead? While there may be mitigating factors, such as location and amenities, these are usually not reflected in the cost approach.
Instead, appraisers rely on the sales comparison approach to value these types of items. Appraisers get to know the neighborhoods in which they work. They understand the value of certain features to the residents of that area. They know the traffic patterns, the school zones, the busy throughways; and they use this information to determine which attributes of a property will make a difference in the value. Then, the appraiser researches recent sales in the vicinity and finds properties which are ''comparable'' to the subject being appraised. The sales prices of these properties are used as a basis to begin the sales comparison approach.
Using knowledge of the value of certain items such as square footage, extra bathrooms, hardwood floors, fireplaces or view lots (just to name a few), the appraiser adjusts the comparable properties to more accurately portray the subject property. For example, if the comparable property has a fireplace and the subject does not, the appraiser may deduct the value of a fireplace from the sales price of the comparable home. If the subject property has an extra half-bathroom and the comparable does not, the appraiser might add a certain amount to the comparable property.