In order to make accurate appraisals on every property in our jurisdiction, it is necessary to visit them periodically to ensure that the data used in making the appraisal is correct. For instance, since we last visited your home the condition of the structure could have changed. The appraisal district could have received a copy of a building permit indicating that a room was being added, the house was being remodeled, or some amenity such as a pool or detached garage was being added to or removed from the property.