Single-Module Prefabricated Housing in Yongsan Embassy Housing

The U.S. Embassy Seoul, under the Department of State, is soliciting proposals for a single-module prefabricated gym facility to be installed at the Yongsan Embassy compound in Seoul, South Korea. The project requires a continuous internal open space of at least 90 square meters with no internal rooms, featuring a designated free-weight zone constructed with the same flooring material but increased thickness. The structure must comply with both U.S. standards—such as the National Electrical Code (NEC) and the Americans with Disabilities Act (ADA)—and Korean codes including KDS, KEC, and Fire Safety Regulations, applying the more stringent requirement where conflicts arise. Thermal performance must meet a U-value of 0.150 W/m²·K or lower for Central Region 1, and electrical systems must interface with the embassy’s existing 120/208V single-phase, three-wire power system, utilizing either recessed or ultra-low-profile surface-mounted lighting fixtures. The scope excludes restrooms, plumbing, primary-side power cables, and underground conduit installation, and does not require the contractor to handle those elements. All products, including those manufactured domestically in Korea, are acceptable, provided they meet specified performance criteria. The contractor must deliver a comprehensive design phase culminating in a 30% design submission that includes all discipline drawings, preliminary interior renderings, a finish schedule with product cutsheets, and proposals for window heights, roof finishing materials, natural lighting, ventilation strategies, and emergency egress routes. The total project duration is capped at 180 days from the Notice to Proceed, inclusive of both design and construction phases, but excludes government review periods: three weeks each for the 30% and 90% design reviews and ten days for construction drawing review. Proposals for alternative structural systems such as lightweight wood frame modular construction are permitted, provided the offeror separately submits structural calculations and U-value test reports along with detailed technical justification demonstrating compliance with OBO SME fire and structural integrity standards. Proposals must be submitted by July 4, 2026, at 5:00 PM Korean Time, and while pricing details are not disclosed, the NAICS code is 321992, indicating the solicitation targets prefabricated building manufacturing. All design and performance submissions must align with referenced drawings, including Conceptual Diagram S-02 and general site setback plans, and adherence to OBO SME criteria is mandatory for evaluation eligibility.