The costs approach is a valuation approach/indicator, not for determining insurance, which I make very clear:
The cost approach has only been developed by the appraiser as an additional analysis in arriving at the opinion of market value for the subject property. Use of this data, in whole or part, for any other purposes is not intended by the appraiser. Nothing set forth in the appraisal report should be relied upon for the purpose of determining the amount, or type of insurance coverage to be placed on the subject property. The appraiser assumes no liability for, and does not guarantee that any insurable value estimate inferred from this appraisal report will result in the subject property being fully insured for any loss that may be sustained. Further, the Cost Approach may not be a reliable indication of replacement or reproduction costs for any date other than the effective date of this appraisal due to changing costs of labor and materials, as well as changes to building codes and governmental regulations and requirements.