Isi-Markon JV LLC

Isi-Markon JV LLC, a service-disabled veteran-owned small business joint venture headquartered in Sterling, Virginia, provides construction management technical support services to federal agencies as a 100% prime contractor, competing predominantly under SDVOSB and Total Small Business set-asides. The vendor is a child entity of Interior Systems, Inc., a veteran-owned parent company at the same address.

Isi-Markon's federal footprint centers on construction management and project engineering for VA facility modernization and DoD Pentagon infrastructure programs. Representative work includes an $41.175 million firm fixed-price delivery order from the Washington Headquarters Service for construction management technical support services at Arlington, Virginia (awarded September 30, 2024, completion March 31, 2029); a $15.674 million delivery order from Washington Headquarters Service for similar services (awarded September 30, 2024, completion March 31, 2029); a $4.189 million delivery order from the VA Office of Construction and Facilities Management for construction management services at the Manhattan VA Medical Center in New York (awarded May 31, 2023, completion May 30, 2025); and a $1.598 million delivery order from Veterans Integrated Service Network 5 for construction management professional services in Baltimore, Maryland (awarded February 23, 2026, completion February 22, 2028). The vendor has also executed multiple task orders at VA medical facilities nationwide for Electronic Health Record Modernization construction management, including orders in Wilkes-Barre, Pennsylvania; Yukon, Oklahoma; Washington, D.C.; and El Paso, Texas, ranging from $210 thousand to $1.025 million.

The vendor's customer concentration is heavily weighted toward defense and VA. The Washington Headquarters Service dominates the portfolio with six awards valued at $179.7 million combined potential value, accounting for approximately 73% of total potential value across all awards. The Department of Veterans Affairs Office of Construction and Facilities Management places the second-largest share with three awards valued at $54.8 million. The Office of the Secretary of Defense, Veterans Integrated Service Network 5, Veterans Integrated Service Network 4, and the GSA Federal Acquisition Service round out a seven-agency customer base. Combined, these top five customer lines represent 100% of recent award potential value.

Isi-Markon holds three IDIQ vehicles anchoring its prime work. The VA Nationwide Construction Services IDIQ, valued at $50 million under SDVOSB set-aside, was awarded March 31, 2022, with completion March 30, 2027; eight task orders have been issued under this vehicle valued at $11.4 million combined. The Washington Headquarters Service single-award IDIQ, valued at $105 million under Total Small Business set-aside, was awarded March 13, 2024, with completion March 12, 2029; six delivery orders totaling $80.3 million have been placed against it. In April 2025, Isi-Markon won positions on two GSA OASIS+ government-wide IDIQs — one under the SDVOSB program and one under the Total Small Business set-aside, both carrying placeholder ceiling values and running through April 2030. These two OASIS+ vehicles represent significant capacity for task-order placement across federal agencies but have not yet generated delivery orders in the source data.

Activity has grown from one award in 2022 to a peak of eight awards in 2024, with recent awards in 2025 and 2026 maintaining momentum. Five awards valued at $9.6 million combined potential value reach ultimate completion within the next twenty-four months, representing near-term recompete exposure concentrated in VA facility construction management work. The vendor's award concentration in firm fixed-price construction management orders, combined with heavy reliance on a single large customer (Washington Headquarters Service), exposes the portfolio to recompete risk if those delivery orders are not renewed or if new customer diversification is not achieved.

Service Contract Inventory reporting captures a limited subset of Isi-Markon's federal activity — $3.8 million in invoiced revenue across eight SCI records (seven as prime) covering fiscal years 2023 and 2024. This reflects SCI's $150 thousand reporting threshold and exclusion of goods and construction delivery orders, the latter of which dominate Isi-Markon's actual award base. The SCI data shows $987 thousand invoiced in FY2023 and $2.9 million in FY2024, with 3.9 and 10.6 contract-level FTEs respectively, indicating modest direct staffing captured in SCI. Across SCI-reportable prime contracts, subcontractors performed 86% of total contractor hours, with nineteen named subs reported across the prime contract base. On federal services contracts captured in SCI, median government-paid rates ran around $120.75 per hour, with rates ranging from a 10th percentile of $55.38 per hour through a 90th percentile of $128.46 per hour, consistent with mid-tier construction management and engineering support pricing. The SCI figures substantially understate Isi-Markon's actual federal revenue footprint, which is anchored by large-dollar fixed-price construction management delivery orders not captured in SCI's service-contract-focused reporting structure.

ISI Professional Services is a Virginia-based consulting firm offering our federal and commercial clients a comprehensive range of services nationwide. ISl's core competencies include: Program & Project Management, Construction Management, Acquisition Consulting, Logistics Support Services, and a wide range of Professional & Administrative Support Services. ISI integrates our diverse capabilities, extensive experience and expertise to deliver client-focused results. As a Service-Disabled Veteran-Owned Small Business, we are uniquely able to respond anywhere and anytime; and, as our nearly 30-year history illustrates, our deeply rooted relationships and success offer a low-risk solution to existing and emerging needs.

ISI's vision is to be our customers' preferred vendor, across our spectrum of services, by delivering dynamic customer value while constantly striving for improvement and exerting organizational excellence.