Columbia Roofing Inc. 6363 S. Hanover Rd. Elkridge, MD 21075 (410) 479-6100 http://columbiaroofing.com [email protected] For more than 30 years, Columbia Roofing in Elkridge, MD, has provided an extensive list of roofing solutions and home improvement options to revamp residential and commercial spaces throughout the state. This family-owned and -operated company performs roofing and gutter installations, as well as windows, doors, and siding replacements for homes, businesses, and property management... read full review »