The Mason & Hanger Group Inc.

The Mason & Hanger Group Inc., a for-profit subsidiary of The Day & Zimmermann Group Inc. headquartered in Lexington, Kentucky, provides comprehensive architect-engineer (A/E) design, survey, analysis, and facilities support services to the Department of Defense and federal agencies as a prime contractor on full-and-open competitive indefinite delivery contracts. The vendor competes predominantly as a prime rather than a subcontractor — 99% of its recent award portfolio is prime work — and does not pursue set-aside designations; all major vehicles and task orders carry no set-aside status.

Mason & Hanger's customer concentration is heavily concentrated in Army Corps of Engineers regional districts. The Department of the Army Corps of Engineers Engineering District Louisville alone accounts for 243 awards ($641.6 million combined potential value), while the Savannah District contributes 69 awards ($338 million), and the Huntsville Engineering Support Center supplies 35 awards ($319.4 million). These three USACE elements represent the bulk of the vendor's dollars: together they anchor 84% of combined potential value across all awards. Naval Facilities Engineering Command and the broader Department of the Navy round out the top five customers, but at substantially smaller volume and value. The concentration on Army Corps of Engineers work — particularly Louisville District — is decisive: that single customer accounts for roughly 38% of all prime awards and 61% of total dollar exposure across the entire 1,011-award portfolio.

Mason & Hanger holds five major indefinite delivery contract vehicles: a $240 million Army Reserve facility design contract with USACE Louisville District (January 2026–December 2030), a $150 million multi-discipline A/E MATOC also with Louisville District (November 2023–November 2028), a $99 million unrestricted MATOC with USACE Charleston (July 2025–July 2030), a $49 million Range and Training Land Program contract with Huntsville Engineering Support Center (September 2025–September 2030), and a $240 million A/E general design contract with USACE Savannah District (May 2024–May 2029). Collectively, these vehicles carry a ceiling of approximately $768 million. Task order issuance across these vehicles has remained steady — 75 to 62 task orders per vehicle on the largest ones — though recent year-over-year award activity has slowed from 25 awards in both 2023 and 2024 to only 11 combined in 2025 and 2026. Within the next twenty-four months, 22 awards carrying combined potential value of $36.9 million will reach ultimate completion and face recompete exposure.

Representative recent prime work spans military construction design and infrastructure modernization. Mason & Hanger delivered a $3.63 million firm fixed-price delivery order to USACE Savannah District for F-35A precision guided munitions support design at Moody Air Force Base, Georgia (February 2026), a $3.32 million design order for collocated vehicle maintenance and support facilities at Defense Logistics Center Richmond, Virginia (September 2023), a $3.43 million microgrid design task order for Joint Base Lewis-McChord, Washington (April 2023), a $2.65 million ABA/ADA accessibility compliance design for four buildings at Fort Liberty, North Carolina (September 2024), and numerous Army Reserve Center design projects in the $1.5 million to $3.6 million range across Jacksonville, Fort Bliss, Marine Corps Logistics Base Albany, and Parks Reserve Forces Training Area. The vendor also executes smaller facility maintenance, HVAC system replacement, fire suppression, and commissioning work for Naval Air Systems Command at Marine Corps Air Station Cherry Point, North Carolina — a recurring customer across dozens of sub-million-dollar delivery orders. Work is performed primarily in Lexington, Kentucky with place-of-performance in Lexington listed on the majority of contracts.

Mason & Hanger operates as a subcontractor in a limited capacity. The Service Contract Inventory dataset shows only 7 records (all subcontract work) with minimal FTE trajectory — 0.3 FTEs in FY2022 to 2.0 FTEs in FY2024 — and no SCI-reportable prime service contract activity. Subcontractor relationships center on Eastern Research Group Inc., under which Mason & Hanger has delivered engineering and technical services supporting the Naval Surface Warfare Center Indian Head Energetics Department, including design-build request-for-proposal development, piping and instrumentation diagrams, site renderings, and building renovation support (awards spanning 2021 through 2024). A single sub-award under BL Harbert International LLC involved architectural design services for the Flight Dynamics Research Facility at NASA Langley Research Center in Hampton, Virginia (October 2021).

The corporate structure includes named joint venture subsidiaries — Mason & Hanger - Tetra TECH JV, Mason & Hanger Hb&A Joint Venture, Mason & Hanger - CDM Smith A JV, Mason & Hanger + Mead & Hunt Joint Venture, and Mason & Hanger - Stanley Joint Venture — alongside Hankins & Anderson Inc. These joint ventures carry capability framing: partnerships with Tetra TECH and CDM Smith signal multi-discipline engineering capacity, and the Mead & Hunt relationship likely anchors planning and civil engineering expertise. The vendor's capability portfolio centers on military and federal facility design, ranging from tactical training infrastructure and Army Reserve Centers to advanced systems facilities (microgrids, electromagnetic warfare labs, unmanned systems labs), accessibility compliance upgrades, and facilities technical assessments. The breadth of NAICS coding (653 awards under Engineering Services, 87 under Architectural Services) and PSC concentration (501 awards under Architect and Engineering—General: Other) reflects a generalist A/E posture serving the Army Corps of Engineers' nationwide construction and modernization mission.