HAR has a fantastic tool to get an accurate CMA both a quick one and a detailed one. Your realtor should be your best resource to provide you with a accurate CMA in order to make an informed decision. whether you are using a CMA to sell or to make an offer you should relay on relevant information The important facts to keep in mind are to compare alike properties (size, colaction, conditions, etc) as well as compile data on both sold (during a reasonable time frame) as well as active listings. This is one of the most important decisions in the process or buying or selling a house, Please ensure you have got the tools and the experience and expertise to back you up!