The flat and steep commercial roof departments have produced some of the company's finest work. These departments have completed notable projects such as The Royal Park Hotel, The Townsend Hotel, Oakland Hills Country Club, The North Oakland YMCA, Rochester Onyx Skate Center , Cranbrook House and the Older Person Commission building among numerous others projects.

One way Allen Brothers has gained trust and an exceptional reputation is by working with only the finest roofing materials in the country. Allen Brothers is a certified installer with all the major manufacturers. Allen Brothers has applied hundreds of thousands square feet of roofing in recent years evident to an increasing amount of successful commercial projects completed over a ten year period.