THE TOP CONSTRUCTION EXPERTS IN CULLMAN, AL HIRE US FOR EVERYTHING FROM STEEL BUILDING CONSTRUCTION TO SIDING INSTALLATION When you're planning a construction project, there's only one company to call. Gary Harbison Construction LLC is an experienced construction contractor serving homeowners and business owners in the Cullman, AL area. We can build custom steel buildings, install siding, add sunrooms to homes and handle interior and exterior painting projects. Your property improvement project is in good hands with our crew.