Building up engineering cost estimates

Please clarify what you are referring to as an engineering cost estimate. 

Are you referring to a cost estimate for engineering services or to a detailed cost estimate for something else?

From the Business Dictionary: “engineering cost estimate. Detailed cost estimate for a project, computed by estimating the cost of every activity in a work breakdown structure, summing these estimates, and adding appropriate overheads.”

The above definition should help answer your question, either way. 

What do you mean by “factor”?

On ‎8‎/‎26‎/‎2019 at 12:53 PM, Kaseybaja said:

What are the significant factors which contractors use to build up their engineering cost estimates?

Have you reviewed the Air Force Institute of Technology Contract Pricing Reference Guide, Volume 3, Chapter 7?