25 C.F.R. § 700.151 – Eligibility.

(a) General. All certified eligible heads of household are eligible for moving and related expenses as prescribed in this subpart. A certified eligible head of household who lives on his/her business or farm property may be eligible for both a payment as a dwelling occupant and a payment with respect to the business or farm operation.
(b) Least costly approach. The amount of payment for an eligible expense under this subpart shall not exceed the least costly method, as determined by the Commission, of accomplishing the objective of the payment without causing undue hardship to the certified eligible heads of household.
(c) Prior approval. Written approval of the Commission must be obtained for all moving and search expenses in this subpart. Such approval shall be obtained by each certified eligible head of household prior to incurring any expense from the real estate specialist to whom the case is assigned. If prior approval and the amount thereof is not obtained from the Commission, the Commission thereafter will determine:
1. (1) Whether the travel was required and the expenses reasonable and;
2. (2) The amount of reimbursement to be paid, if any.