Because the contractor relies on the estimator's experience and expertise, the estimator: Question 13 options: does not need to consult with other office personnel or field superintendents about the project to be bid. rarely needs to follow the general setup of the specifications as long as they include all of the parts of the project. only notifies subcontractors and suppliers when he does not know the cost of the work. reviews and carefully checks all of the contract drawings and specifications and double-checks all figures and calculations