What often separates roofing companies is the quality of the site clean up at the end of a job.
Professional roofing contractors should remove all roofing debris, clean out the gutter system and do a thorough cleaning of the grounds and landscaping. Included in this is the use of a magnet to pick up any nails that have reached the ground level. The perimeter of the home including lawn, landscaped areas, driveway and support vehicle parking area should be included in the search for nails.