Interface Engineering Selected for The Octagon House Modernization

Interface Engineering has been selected by the Architects Foundation to support the sensitive modernization of The Octagon House, a 9,000‑square‑foot National Historic Landmark located at 1799 New York Avenue NW in Washington, DC.

Built in 1799, the Federal‑period masonry building is undergoing a comprehensive evaluation and upgrade of its mechanical, electrical, plumbing, and fire protection systems to better support its use as a historic museum while preserving its architectural character. The project centers on a full HVAC overhaul designed to reduce energy use and introduce a high‑performance system appropriate for a landmark structure with single‑pane windows and significant historic detailing.

Interface’s scope includes MEPFP engineering services to assess existing conditions, develop a system upgrade strategy, and support performance‑based planning aligned with the project’s sustainability goals. The work will prioritize durable, maintainable, and energy‑efficient solutions that minimize impacts to historic fabric and support the Foundation’s goal of achieving LEED® Certified. Optional energy modeling services will evaluate system performance and feasibility relative to LEED objectives.

All recommendations will balance modern building performance, accessibility, and long‑term operational needs with preservation requirements for this nationally significant historic resource.