Well, let's look at an example; the job is running power for a new air conditioner.

Contractor #1 provides a quote that reads: "Power for new air conditioner $300."

Contractor #2 provides a quote that reads:
"Power for the new air conditioner will be taken from the interior panel. Wiring method will be cable for the 27-ft. inside portion of the run, where I will transition to EMT for the outside run to the disconnect. The disconnect will be a Square D QO200TR, with an HACR-rated breaker in place of the simple switch provided with the unit. The whip to the unit will be supported, and have a metal liner.
"All holes will be patched in a manner appropriate for the wall material, and fire sealing will be done where needed. If you have some matching paint, we will even paint the patches; otherwise we will use an appropriate primer.
"Before work begins we will obtain the permit. We will close off the work area and use tarps to contain any construction mess. At the end of the job we will clean up, and remove all trash, with larger items hauled away. Shrubbery will be protected, or pulled away from the work area.
"Work will be performed weekdays, with our crew on site no earlier than 8:30AM and no later than 9AM. Work will be completed, and the area cleaned up, no later than 4PM of each work day. Our trucks will not block your driveway.
"We ask that you allow our workers access to a bathroom.
"You will not be disturbed by loud radios or music.
"For this project, our price is $300."
"(Attached is a sketch of our proposed wire routing and schedule)."

Now ... which quote do you like?