N.H. Rev. Stat. Ann. § 21-J:10 - Assistance to Municipalities.

The commissioner may assist any municipality in the appraisal and valuation of the taxable property therein upon written request by the proper municipal officers or when the municipality shall so vote. The department shall recover the full costs of providing such appraisal and valuation services, including the direct and indirect costs of appraisal staff and indirect administrative and support costs.