Hello all... thanks in advance to anyone that is willing to respond with suggestions, etc. I was wondering if there's a formula used to calculate residential home market value? We're trying to refinance our home and the appraiser would not disclose exactly how he arrived at the market value of our property. I also found data errors on 3 out of the 5 comps that were used, i.e. 2 car vs. 1 car garage, air cooling system different, bathroom and bedroom count listed incorrectly. Our loan officer had sent rebuttal, 2 emails noting the data comp errors and asking for the calculation of the market value from the appraiser. Finally, the appraiser DID make some corrections to the comps but our property market value remains the same. The only answer we received back regarding the calculation of value was: Most weight given equally to the 3 closed sales comps and the 2 active listings comps support the final opinion of value. On the original Appraisal Report, it says "Most weight was placed on the Direct Sales Comparison Approach. The Cost Approach provided sound support for the final valuation. Out of the 5 comps selected, 3 were closed sales and 2 were active listings. Should it be the average of the Sale Price/Gross Living Area of all the comps used multipled by my property's Gross Living Area? For example: take the average of the 5 comps (all variances adjusted) and multipled by my property's Sale Price/Gross Living Area. Using this formula, my result is $30,000 more than what the appraiser has. Any suggestions/advice would be greatly appreciated. Thank you.