Home appraisals are usually less than 10 pages and completed within seven days. A house appraisal has three components. First, the appraiser must physically visit and examine the home.omparables. Recent area sales, within the prior 12 months, of similar properties must be used to establish an accurate opinion of value. Before the advent of fast, sophisticated appraisal report software and accurate real estate data bases, appraisers had to conduct time-consuming searches of real estate records.