A roofing project is a complicated process involving many steps. Since these are integral parts of the roof system but largely independent of its area, a unit price can vary widely from project to project.

There are other factors that affect the roofing project. These include insulation requirements, building height, roof preparation requirements (i.e. demolition costs, etc.), and mobilization costs. Contrary to popular belief, the type or brand of roof system has a relatively small effect on the price of the project.