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About // Overview

Mason & Hanger, a Day & Zimmermann Company, is dedicated to providing architectural and engineering services, specializing in the worldwide design of secure, mission-driven facilities, proudly serving as a partner to the United States Government for nearly two centuries.  Mason & Hanger is a trusted partner of the U.S. Department of Defense (Army, Navy, Air Force, Marines, and National Guard), Department of Defense Reserves, Department of Homeland Security, Department of State, Department of Energy, among other government agencies critical to the U.S. National Security Mission.

Mason & Hanger has a rich history covering nearly 200 years, as the oldest operating A/E firm in the United States. The teams have combined experience that has served the federal government in thousands of projects, in 48 states and 163 countries. With offices in Lexington, Kentucky and Richmond, Virginia Beach and Woodbridge, Virginia, the Company has ranked nationally among the Top 15 A/E firms in Government Building Design. The firm consistently ranks in ENR’s list of top international design firms. In 2016, as part of Day & Zimmermann, the overall company ranked #172 among the Annual Top 500 Design Firms by Engineering News-Record. They were listed as a Top Workplace in the Greater Richmond Area for the past two years. Mason & Hanger is a longstanding member of the American Council of Engineering Companies with active participation among its principals.


» Architecture
» Interior Design
» Mechanical Engineering
» Electrical Engineering
» Telecommunications / Data
» Technical Security Systems
» Life Safety / Fire Protection
» Civil Engineering
» Structural Engineering
» Security Design Services
- Blast Analysis and Design
- Progressive Collapse
- Physical Security
- Technical Security
- Environmental Security
- Range and Training Facilities
» Building Sciences
- CFD Modeling
- Energy Modeling
- Sustainability / LEED Design
- Commissioning & Energy Audits
» Contract Administration
» Cost Estimating


» Design-Build
» Anti-terrorism / Force Protection (AT/FP), Blast Analysis and Design, Architectural Illustrations, Building Information Modeling (BIM), Technical Security, Physical Security
» Mission-Driven Facilities: Command and Control Centers, Embassies and Consulates, Communication Facilities, Data Centers, Headquarter Facilities, Secure Office Buildings, Training Facilities, Shooting Ranges, SOF Mission Facilities, Aviation Pavements & Systems, Military Planning, Blast/Explosives, Munitions/Weapons
» Energy & Sustainability Services: Energy Auditing/Modeling, Computational Fluid Dynamics (CFD) Analysis/Modeling, Hydrothermal Studies, Renewable Energy, Microgrids, Sustainability Management & LEED Services, Building Envelope Services, Net Zero Energy & Waste


» U.S. Department of Defense (Army, Navy, Air Force, Marines, National Guard)
» U.S. Department of Defense Reserves (Army, Navy, Air Force, Marines, National Guard)
» Department of Homeland Security
» Department of State
» Department of Energy
» Among other government agencies