Steve C Boneso Construction Inc.

Steve C Boneso Construction Inc. Boneso Plumbing & Mechanical Division, doing business as Boneso Plumbing And Mechanical, is a California-based plumbing and mechanical contractor that subcontracts on federal military construction projects, exclusively in the sub role (100% of recent awards) with no prime contract vehicle presence or federal grant participation.

Boneso operates as a for-profit corporate entity headquartered in Santa Margarita, California. The vendor's federal footprint is entirely subcontractor work, with plumbing, HVAC, and site utilities scope across military facility modernization and repair projects. Recent work includes plumbing installation on the F-35C Hangar 6 Phase 2 project under Harper Construction Company as prime, sewer and HVAC repair on facility Towers A, B, and C under Harper Construction as prime, and heating, ventilation, air-conditioning, and plumbing work on the modernization of an academic and research facility (Halligan Hall B-234) at Monterey under RQ Construction as prime.

Customer concentration is tightly constrained. The Department of the Navy Naval Facilities Engineering Command accounts for 12 of 13 recent awards; the remaining award is with the Department of the Navy Naval Education and Training Command. The vendor serves two distinct customer agencies, both within the Navy enterprise, and has no activity across other federal departments. Boneso's top two parent vehicles are the Construction, Renovation, And Repair Of Commercial And Institutional Building Projects 2020-2025 MACC and the Commercial and Institutional MACC V, each carrying a single task order. Dollar concentration is steep — $36.4 million in combined obligated value across thirteen awards, all clustered within the Navy's facilities engineering footprint.

Activity shows a sharp taper. Twelve awards were placed in 2023 (including multiple plumbing sub-allocations on the same project); one award has appeared in 2025. The vendor has no announced recompete activity in the source data and no pipeline visibility beyond the single 2025 award. Boneso operates exclusively as a sub under Harper Construction Company (which accounts for the bulk of the 2023 activity) and RQ Construction, with no visible teaming arrangements or downstream subs. The vendor's capability portfolio is narrow and specialized — plumbing rough and finish work, mechanical systems installation, and site utilities — positioned as a trade specialty sub on larger military construction primes rather than as a systems integrator or prime contractor.