Tennessee Code Title 13. Public Planning and Housing § 13-3-503

(2)(A) The value of existing residences within the developed area of single family residences, if the valuation of the residence being moved appraised, prior to being moved, at a value that is at least equal to the average appraisal of the existing structures within the developed area; provided, that nothing in this subdivision (2) shall be construed to prevent the residence from exceeding the value of the existing structures. In establishing the value of existing structures, the value of modular homes located in the developed area shall not be used in arriving at the average appraisal of the existing structures;

(B) If the value of the residence, prior to being moved, appraised at a value that is at least equal to the average appraisal of the existing structures within the developed area, then it shall be presumed that the residence shall appraise at least at the same or greater value once it is moved;

(C) In obtaining approval from a governing body identified in § 13-3-502, as proof that the value of the residence or appearance of the residence is consistent with the value or appearance of the existing residences, evidence may be presented that includes photographs of the inside and outside of the residence to be moved as well as the appraised value of the residence as determined by the assessor of property, or the fair market value of the residence as determined by an independent appraiser. The proof shall be a rebuttable presumption that the value and appearance of the residence is at least equal to the value and appearance of the existing structures within the developed area. Additional documents showing intended improvements may also be presented;