Cost Approach:
A set of procedures through which a value indication is derived for the fee simple interest in a property by estimating the current cost to construct a reproduction of (or replacement for) the existing structure, including an entrepreneurial incentive; deducting depreciation from the total cost; and adding the estimated land value. Adjustments may then be made to the indicated fee simple value of the subject property to reflect the value of the property interest being appraised.
Nobody can agrue with the definition, and though it says to include an entrepeneurial incentive, it does not spell out whether the entrpreneurial inicentive should be equivalent to that a developer would charge.
The definition does not define what amount if EP is reasonable, or excessive, nor does it state WHO is supposed to be doing the building...seems like a composite builder an appraiser bases the approach on, with cost figures found by survey/and or using the cost manuals available. It seems that some appraisers might use a relatively fixed EP, and others giving great range to EP to move with the market.
The definition leaves it up to the appraiser to derive their own assumption of "Who" is building and what profit they are charging, and whether the profit is reasonable and supportable in the market.