Which of the following is NOT a main type of cost estimate in construction?

The correct choice is comprehensive estimate because it is not recognized as a primary category of cost estimates in construction practices. The main types of cost estimates typically include preliminary estimates, which are broad assessments used during the early stages of project planning to provide a rough idea of expected costs; detailed estimates, which involve comprehensive calculations and quantities for all aspects of the project; and bid estimates, which are prepared specifically for the purpose of submitting a proposal to win a contract.

While a comprehensive approach can certainly be part of detailed estimating, the term "comprehensive estimate" itself does not serve as a standard classification within the field of construction cost estimation. Therefore, distinguishing it from the established categories helps clarify understanding and application in construction cost management.