Section 15-1933. Construction

1.  In general all construction work shall be done by contract, but in
  the event that the estimated cost of such work or of a specified portion
  thereof shall not exceed the sum of twenty-five  thousand  dollars,  the
  department   may,   on   the   recommendation  of  the  Commissioner  of
  Transportation, authorize the Commissioner of Transportation to do  such
  work or part of such work by days' work under his direction.
    2. All costs of supervision and inspection of construction work, costs
  of  making  surveys, plans and estimates in connection therewith and the
  costs of taking title to property and  any  other  costs  which  may  be
  incurred  in  connection  with  or  incidental  to  such  work  shall be
  considered a part of the cost of such improvement.