By law, counties are required to do a reappraisal every 6 years, and every third year to do an update of values. During a reappraisal, a property must be reviewed and visited to ensure that it is listed correctly and that the market value set is correctly. These reviews and market values are set by certified appraisers. Market values set during a reappraisal and updates are based on sales in the neighborhood that is set by the appraisers and the county. Your value will only change every 3 years unless you have a change to your property. These changes, known as new construction, are reviewed by appraisers and applied every year. Every year the county must submit these values to the State of Ohio for approval. The State of Ohio makes the final determination on what values must be.