Probate Code § 10167
ARTICLE 3. Compensation of Agent, Broker, or Auctioneer
(a) Subject to subdivision (b), whether or not the auctioneer has a contract with the personal representative, the fees, compensation, and expenses of an auctioneer in connection with a sale of property shall be the amount the court, in its discretion, determines to be a reasonable compensation for the services of the auctioneer to the estate.
(b) If the auctioneer has a contract with the personal representative, the amount of the compensation of the auctioneer in connection with the sale of property shall not exceed the amount provided for in the contract.