ONEILL CONTRACTORS INC

Oneill Contractors Inc. specializes in mission-critical building systems installation, renovation, and maintenance for federal installations, with deep expertise in plumbing, heating, air-conditioning, and commercial construction. The contractor routinely executes complex HVAC upgrades, fire suppression system installations, boiler and ductwork replacements, and classified space modifications aboard military and coast guard facilities. Their technical proficiency extends to elevator modernization, vault door replacements, and pier infrastructure repairs, demonstrating mastery of both mechanical systems and structural integrity requirements in high-security, high-availability environments. Their ability to deliver precision work onboard naval stations and within sensitive federal facilities underscores a strong command of defense-grade construction standards and operational continuity protocols. The company maintains a consistent presence with the Department of Defense, delivering essential facility upgrades at Naval Station Great Lakes and other military installations, while also serving the Department of Homeland Security with critical infrastructure repairs for U.S. Coast Guard assets. The General Services Administration engages them for elevator modernization and building equipment upgrades, reflecting trust in their ability to meet federal property standards. Their work is characterized by precision, compliance with federal building codes, and minimal disruption to ongoing operations. Oneill Contractors Inc. focuses primarily on NAICS 238220 (plumbing, heating, and air-conditioning) and 236220 (commercial and institutional building construction), positioning them as a trusted provider of integrated building systems and facility enhancements for government-owned structures. Their work supports defense, homeland security, and federal administrative facilities, with a clear emphasis on lifecycle maintenance and retrofits rather than new ground-up construction. As a Women-Owned Small Business and Service-Disabled Veteran-Owned Business certified firm based in Glenview, Illinois, Oneill Contractors Inc. leverages its dual certification to meet federal small business goals while maintaining a regional footprint focused on Midwest federal installations. Their operational model combines technical rigor with compliance discipline, making them a preferred partner for complex, security-sensitive facility projects.