The Zoning Commission, Planning Board or Zoning Board of Appeals, in reviewing any application pending before it, may refer such application, at its discretion, to any engineering, planning, technical, legal or environmental consultants that it deems necessary. The fees charged by the consultant will be paid for by the applicant. At the time the application is submitted, the Board shall obtain an estimate from its consultant for the work that is to be performed on the application on behalf of the Board.