Roofing Colorados Front Range Since 1982. Douglas Roofing Company was started on the foundation of a simple idea back when much of Colorados front range was still wide open country. Times have changed across the entire Denver Metro since 1982 but that foundation we began with has not changed: to do our very best, every time, to ensure your best interest is always at the forefront, to stand behind our word and to give you our all; every second, every minute, every day.