It really depends on exactly what needs to be moved and what kind of work the company is going to have to put into it. It could be really cheap to clear a large area, if it's an easy job. At the same time, a small are could cost a lot is there are difficult trees and obstacles involved in the job. You should talk to a few companies to get quotes on your work. That will provide you with the information you need to get your work done as well as possible.