KARN CHARUHAS CHAPMAN & TWOHEY PC

KARN CHARUHAS CHAPMAN & TWOHEY PC specializes in architectural and engineering services for complex federal facilities, with deep expertise in building modernization, permitting coordination, and integrated design for mission-critical infrastructure. The firm delivers comprehensive A&E solutions including schematic design, construction documentation, code compliance, and renovation planning—particularly for high-security diplomatic and defense facilities. Their technical proficiency spans HVAC system diagnostics, structural integration, and adaptive reuse of historic government buildings, often executing scope expansions at no additional cost to the government, demonstrating operational agility and fiscal responsibility. They are adept at navigating stringent federal permitting processes and delivering multi-phase renovations under tight operational constraints. The contractor maintains a sustained relationship with the Department of State, providing architectural services for embassy and diplomatic compound modernizations, including the Harry S. Truman Building and U.S. missions abroad. They also support the Department of Defense with architectural and engineering design for overseas renovation projects, particularly in Europe, and have delivered specialized HVAC investigations for State Department facilities. Their engagement with the General Services Administration and Department of Justice reflects a niche focus on federal building lifecycle management and security infrastructure upgrades. Primarily operating under NAICS 541310 (Architectural Services) and 541330 (Engineering Services), the firm positions itself as a boutique provider of integrated design solutions for U.S. government infrastructure, with a focus on security-sensitive, historically significant, and diplomatically important properties. Their work in plumbing, heating, and air-conditioning contracting (NAICS 238220) underscores their ability to address building systems holistically. As a privately held professional services firm based in Washington, D.C., with no federal certifications listed, the company leverages its geographic proximity to federal decision-makers and deep institutional knowledge of State and DoD facility standards to deliver tailored, compliance-driven design services.